@article{AichBarghaviBenim2025, author = {Aich, Rishav and Barghavi, Devarakonda and Benim, Ali Cemal}, title = {Effect of hydrodynamic and thermal anisotropy on convective heat transfer in a fluid saturated porous duct: A finite volume approach}, series = {Numerical Heat Transfer: An International Journal of Computation and Methodology, Part A: Applications}, journal = {Numerical Heat Transfer: An International Journal of Computation and Methodology, Part A: Applications}, publisher = {Taylor \& Francis}, issn = {1521-0634}, doi = {10.1080/10407782.2025.2527971}, pages = {22}, year = {2025}, subject = {Numerische Str{\"o}mungssimulation}, language = {de} } @article{BerkantOezelDurmazNurOezetal.2025, author = {Berkant {\"O}zel, Mehmet and Durmaz, Ufuk and Nur {\"O}z, Muhammed Ali and {\"U}mit Tepe, Ahmet and {\"O}z, Cemil and Uysal, {\"U}nal and Yal{\c{c}}inkaya, Orhan and Cemal Beni̇m, Ali and Alomayrah, Norah and Al-Buriahi, M.S.}, title = {Enhanced prediction of heat transfer in jet impingement cooling using an artificial intelligence: A case study}, series = {Case Studies in Thermal Engineering}, volume = {73}, journal = {Case Studies in Thermal Engineering}, publisher = {Elsevier}, issn = {2214-157X}, doi = {10.1016/j.csite.2025.106605}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-55017}, pages = {11}, year = {2025}, abstract = {This paper is about the gas turbine cooling model using the extended jet array. The aim of the present study is to explain the effect of the impinging jet configuration of elongated jet holes on the heat transfer distribution with a deep Convolutional Neural Network (CNN). CNNs preserve spatial relationships through convolutional operations—unlike traditional Artificial Neural Networks (ANNs), which require flattening of input data—allowing for higher accuracy with smaller datasets and faster training due to fewer trainable parameters. The goal is to understand how accurate and fast deep learning models with limited data can deliver predictions for complex systems such as jet impingement cooling. The proposed CNN model was compared with the numerical and experimental data. Jet impingement cooling was examined with four different Reynolds numbers (16250, 21700, 27100, 36250) and six dimensionless gaps between the jet and the target surface (G/D = 1, 2, 3, 4, 5, and 6). Mean and local Nusselt number (Nu) distributions were investigated in particular. G/D = 2 was selected as the test data for the model among the configurations. While the CFD model failed to identify this peak performance point, the CNN model accurately captured this maximum behavior despite being trained only on other configurations. Moreover, the CNN model demonstrated more suitable prediction accuracy in the first two jet impingement regions than the CFD data, especially in capturing peak Nusselt numbers and localized hot spots. It has been determined that the CNN model provided more accurate predictions of the local Nusselt numbers within the measurement region compared to the Computational Fluid Dynamics (CFD) study for the average Nu, the proposed CNN model showed a closer agreement to experimental data than numerical simulation by 4.15 \% at the Re = 32500 and G/D = 2.}, subject = {Maschinelles Lernen}, language = {en} } @misc{OPUS4-5508, title = {Computation Special Issue Reprint: Computational Methods in Wind Engineering}, editor = {Benim, Ali Cemal}, edition = {2. Aufl.}, publisher = {MDPI}, address = {Basel, Beijing, Wuhan, Barcelona, Belgrade, Novi Sad, Cluj, Manchester}, isbn = {978-3-7258-3850-9}, issn = {2079-3197}, doi = {10.3390/books978-3-7258-3850-9}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-55089}, pages = {216}, year = {2025}, abstract = {In wind engineering, in parallel to all other engineering disciplines, the impact of computational methods is rapidly increasing. As far as computational aspects are concerned, wind engineering embodies a series of specific challenges, including the availability of suitable validation data, the definition of boundaries and boundary conditions, scale disparities, and fluid-structure interaction. The present Special Issue shows recent advances in the development and application of computational methods in wind engineering.}, subject = {Wind}, language = {en} } @periodical{OPUS4-5477, title = {14th International Conference on Computational Heat and Mass Transfer}, series = {Heat and Mass Transfer}, journal = {Heat and Mass Transfer}, editor = {Benim, Ali Cemal}, publisher = {Springer Nature}, issn = {1432-1181}, year = {2025}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @incollection{DenizCanalDiederichKaracayetal.2025, author = {Deniz Canal, Cansu and Diederich, Michael and Karacay, Onur and Benim, Ali Cemal and Hamberger, Andreas and Heese, Markus and Schr{\"a}der, K. H.}, title = {Investigation of Boiler Efficiency Improvements via Enthalpy Wheel with Application to a Biomass Boiler}, series = {Mathematical Theory and Simulation of Scientific Problems: FIAM-2023, Dubai, UAE, December 21-22}, volume = {Springer Proceedings in Mathematics \& Statistics, Bd. 487}, booktitle = {Mathematical Theory and Simulation of Scientific Problems: FIAM-2023, Dubai, UAE, December 21-22}, editor = {Sharma, Rajesh Kumar and Srivastava, Shailesh Kumar and Benim, Ali Cemal}, publisher = {Springer Nature}, address = {Singapore}, isbn = {9789819625789}, issn = {2194-1009}, doi = {10.1007/978-981-96-2579-6_13}, pages = {189 -- 200}, year = {2025}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @incollection{CanalBenim2025, author = {Canal, Cansu Deniz and Benim, Ali Cemal}, title = {Numerical Study of Co-Firing in Swirl Burner Using Coal-Biomass Blends}, series = {Mathematical Theory and Simulation of Scientific Problems: FIAM-2023, Dubai, UAE, December 21-22}, volume = {Springer Proceedings in Mathematics \& Statistics, Bd. 487}, booktitle = {Mathematical Theory and Simulation of Scientific Problems: FIAM-2023, Dubai, UAE, December 21-22}, editor = {Sharma, Rajesh Kumar and Srivastava, Shailesh Kumar and Benim, Ali Cemal}, publisher = {Springer Nature}, address = {Singapore}, isbn = {9789819625789}, issn = {2194-1009}, doi = {10.1007/978-981-96-2579-6_3}, pages = {21 -- 32}, year = {2025}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{VishwakarmaBhattacharyyaSonietal.2025, author = {Vishwakarma, Devendra Kumar and Bhattacharyya, Suvanjan and Soni, Manoj Kumar and Benim, Ali Cemal}, title = {Transitional Mixed Convection in Inclined Solar Air Heater Tube with Wavy Inserts}, series = {Heat Transfer Engineering}, journal = {Heat Transfer Engineering}, publisher = {Informa}, issn = {0145-7632}, doi = {10.1080/01457632.2025.2480906}, pages = {15}, year = {2025}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{SulaimanSaberHasanetal.2025, author = {Sulaiman, Mohammed A. and Saber, Hindren Ali and Hasan, Hasan F. and Benim, Ali Cemal}, title = {Experimental and numerical investigation of novel dew-point evaporative cooler with shell and tube design}, series = {Energy}, volume = {317}, journal = {Energy}, publisher = {Elsevier}, issn = {0360-5442}, doi = {10.1016/j.energy.2025.134686}, year = {2025}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BiswasMandalMannaetal.2025, author = {Biswas, Nirmalendu and Mandal, Dipak Kumar and Manna, Nirmal K. and Benim, Ali Cemal}, title = {Thermomagnetic convection and entropy generation in a hybrid nanofluid filled wavy-walled cavity heated non-uniformly}, series = {Archives of Thermodynamics}, journal = {Archives of Thermodynamics}, publisher = {Polish Academy of Sciences}, issn = {1231-0956}, doi = {10.24425/ather.2025.154182}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-52344}, pages = {61 -- 81}, year = {2025}, abstract = {In this work, thermomagnetic convection and irreversibility production in a hybrid nanofluid-filled wavy-walled porous thermal system containing a semi-circular heated bottom is presented. Both the sidewalls of the enclosure are cooled and undulated with varying undulation numbers. The lower wall is partially undulated following a semi-circular-shaped object and is heated isothermally. The horizontal walls are insulated. The cavity is occupied with Cu-Al2O3/water-based hybrid nanofluid and porous substances under the impact of the evenly applied horizontal magnetic field. This work significantly contributes to the existing research rendering an exhaustive understanding of the hydrothermal flow-physics as well as irreversibility production of a hybrid nanofluid in the cavity having surface undulation. The Galerkin weighted finite element method is utilized to solve the mathematical model. The hydrothermal performance of the thermal system is considerably influenced by various pertinent factors such as Darcy-Rayleigh number, Darcy number, Hartmann number, and number of undulations. The wall undulations have a critical role in altering the hydrothermal performance. Heatlines are used to analyse heat transport dynamics from the protruded hot surface to the heat sink. The protruded heater wall induces the formation of a hot upward plume in the nearest fluid layers. The flow divides into two parts forming a pair of circulations due to symmetrical cooling at the sidewalls. The flow behaviours are significantly dampened by increasing the Hartmann number. The associated total entropy generation is also demonstrated. This study contributes to the existing domain knowledge and provides insights for designing and optimizing similar thermal systems.}, subject = {W{\"a}rme{\"u}bertragung}, language = {en} } @article{BenimCicek2023, author = {Benim, Ali Cemal and {\c{C}}i{\c{c}}ek, Ayd{\i}n}, title = {Comparative analysis of water and carbon dioxide injection for the thermohydraulics of an EGS project in Dikili Geothermal Field, T{\"u}rkiye}, series = {Bulletin Of The Mineral Research and Exploration}, volume = {171}, journal = {Bulletin Of The Mineral Research and Exploration}, publisher = {Maden Tetkik ve Arama Genel M{\"u}d{\"u}rl{\"u}ğ{\"u}}, issn = {0026-4563}, doi = {10.19111/bulletinofmre.1288731}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-49115}, pages = {91 -- 105}, year = {2023}, abstract = {A comparative numerical analysis of the thermohydraulics of an enhanced geothermal system (EGS) project in T{\"u}rkiye in Dikili area is presented. The fractured granodiorite is modelled as porous media, utilizing the numerically suggested data of other authors for the corresponding hydraulic characteristics. As the heat transmission fluid, two different mediums are alternatively considered. These are the more classical medium, water and the supercritical Carbon Dioxide (sCO2). Transient calculations are performed for a time period of twenty years, comparing the temporally developing results obtained for water and sCO2 with each other. Based on modeling parameters and assumptions, higher production temperatures are observed with sCO2, in comparison to water, implying an advantage for sCO2 usage as a working fluid in EGS. This is accompanied by the further advantage of a lower pressure drop for sCO2. On the other hand, the temperature advantage is relativized by the lower specific heat capacity of sCO2 causing a decrease in the production thermal power. In general, the present re found to be encouraging for a further and more detailed analysis of the employment of sCO2 as working fluid in EGS.}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{OezmanGuelDiederichetal.2022, author = {{\"O}zman, Cansu and G{\"u}l, Fethi and Diederich, Michael and Benim, Ali Cemal and Janoske, Uwe}, title = {Computational and Experimental Investigation of Flow and Convective Heat Transfer along Rough Surfaces}, series = {Proceedings of CONV-22: Int. Symp. on Convective Heat and Mass Transfer June 5 - 10, 2022, Turkey}, booktitle = {Proceedings of CONV-22: Int. Symp. on Convective Heat and Mass Transfer June 5 - 10, 2022, Turkey}, publisher = {Begellhouse}, doi = {10.1615/ICHMT.2022.CONV22.590}, pages = {447 -- 454}, year = {2022}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{BenimCicek2022, author = {Benim, Ali Cemal and {\c{C}}i{\c{c}}ek, Ayd{\i}n}, title = {Investigation of the Thermohydraulics of an EGS Project in Turkey: Comparative Assessment of Water and CO2 as Heat Transfer Fluid}, series = {Proceedings of CONV-22: Int. Symp. on Convective Heat and Mass Transfer June 5 - 10, 2022, Turkey}, booktitle = {Proceedings of CONV-22: Int. Symp. on Convective Heat and Mass Transfer June 5 - 10, 2022, Turkey}, publisher = {Begellhouse}, doi = {10.1615/ICHMT.2022.CONV22.580}, pages = {439 -- 446}, year = {2022}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{RueckertBurhanAhmedetal.2024, author = {R{\"u}ckert, Frank Ulrich and Burhan, Ibrar and Ahmed, Arslan and H{\"u}bner, Dirk and Allweyer, Benjamin and Klinger, Friedrich and Benim, Ali Cemal}, title = {Development of a Passive Cooling System for a Gearless Wind Energy Generator}, series = {Advances in Computational Heat and Mass Transfer Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, volume = {1}, booktitle = {Advances in Computational Heat and Mass Transfer Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031672408}, issn = {2195-4356}, doi = {10.1007/978-3-031-67241-5_30}, pages = {333 -- 343}, year = {2024}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{YalcınkayaDurmazTepeetal.2024, author = {Yal{\c{c}}{\i}nkaya, Orhan and Durmaz, Ufuk and Tepe, Ahmet {\"U}mit and Benim, Ali Cemal and Uysal, {\"U}nal}, title = {Numerical Analysis of Roughened Target Surface for Enhancing Jet Impingement Cooling}, series = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, volume = {1}, booktitle = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031672408}, issn = {2195-4356}, doi = {10.1007/978-3-031-67241-5_64}, pages = {713 -- 720}, year = {2024}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BhattacharyyaBhattVishwakarmaetal.2024, author = {Bhattacharyya, Suvanjan and Bhatt, Tapasvi and Vishwakarma, Devendra Kumar and Benim, Ali Cemal and Abraham, John}, title = {Effect of mechanical vibration and its influence on thermal performance of a nanofluid heat exchanger}, series = {Numerical Heat Transfer: An International Journal of Computation and Methodology, Part A: Applications}, journal = {Numerical Heat Transfer: An International Journal of Computation and Methodology, Part A: Applications}, publisher = {Informa}, issn = {1040-7782}, doi = {10.1080/10407782.2024.2331589}, pages = {1 -- 24}, year = {2024}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{BiswasMandalMannaetal.2024, author = {Biswas, Nirmalendu and Mandal, Dipak Kumar and Manna, Nirmal K. and Benim, Ali Cemal}, title = {Thermomagnetic Convection in a Hybrid Nanofluid-Filled Wavy-Walled Porous System with Protruded Bottom Heating}, series = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, volume = {2}, booktitle = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031666087}, issn = {2195-4356}, doi = {10.1007/978-3-031-66609-4_35}, pages = {375 -- 385}, year = {2024}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{BhattacharyyaJainBhattetal.2024, author = {Bhattacharyya, Suvanjan and Jain, Naman and Bhatt, Tapasvi and Ghosh, Soumya and Benim, Ali Cemal}, title = {Heat Transfer Augmentation in a Mini-channel Using Magnetic Nanofluid and Magnetic Vortex}, series = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, volume = {2}, booktitle = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031666087}, issn = {2195-4356}, doi = {10.1007/978-3-031-66609-4_1}, pages = {3 -- 11}, year = {2024}, subject = {W{\"a}rme{\"u}bertragung}, language = {en} } @inproceedings{SaeedrashedSachdevaSinghetal.2024, author = {Saeedrashed, Younis and Sachdeva, Aryaman and Singh, Srijna and Benim, Ali Cemal}, title = {Numerical Simulation of Cavitation Characteristics on Stepped Spillway Due to Different Geometry Configuration}, series = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, volume = {2}, booktitle = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031666087}, issn = {2195-4356}, doi = {10.1007/978-3-031-66609-4_66}, pages = {715 -- 725}, year = {2024}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{OPUS4-4850, title = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, series = {Lecture Notes in Mechanical Engineering}, booktitle = {Lecture Notes in Mechanical Engineering}, editor = {Benim, Ali Cemal and Bennacer, Rachid and Mohamad, Abdulmajeed A. and Ocłoń, Paweł and Suh, Sang-Ho and Taler, Jan}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031672408}, issn = {2195-4356}, doi = {10.1007/978-3-031-67241-5}, year = {2024}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @inproceedings{VishwakarmaBhattacharyyaSonietal.2024, author = {Vishwakarma, Devendra Kumar and Bhattacharyya, Suvanjan and Soni, Manoj Kumar and Ghosh, Soumya and Benim, Ali Cemal}, title = {Transition Flow Heat Transfer and Pressure Drop in a Uniformly Heated Inclined Solar Air Heater Fitted with Wavy Tapes}, series = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, volume = {1}, booktitle = {Advances in Computational Heat and Mass Transfer: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, D{\"u}sseldorf, Germany}, editor = {Benim, Ali Cemal and Bennacer, Rachid and Mohamad, Abdulmajeed A. and Ocłoń, Paweł and Suh, Sang-Ho and Taler, Jan}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031672408}, issn = {2195-4356}, doi = {10.1007/978-3-031-67241-5_63}, pages = {703 -- 712}, year = {2024}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{SidharthRajkumarChithrakumaretal.2022, author = {Sidharth, K. Pillai and Rajkumar, Mattacaud R. and Chithrakumar, V. K. and Asirvatham, Godson L. and Benim, Ali Cemal and Wogwises, Somchai}, title = {Impact of increased outer wall rotation on convection in a vertical annulus with a stationary heated inner cylinder}, series = {Heat Transfer}, volume = {51}, journal = {Heat Transfer}, number = {7}, publisher = {Wiley}, issn = {2688-4534}, doi = {10.1002/htj.22617}, pages = {6656 -- 6684}, year = {2022}, abstract = {The interplay of centrifugal and buoyant forces on convective heat transfer in a vertical annulus formed by rotating adiabatic outer cylinder and stationary heated inner cylinder has been experimentally and numerically investigated. Experiments were performed for rotational speeds corresponding to the rotation parameter ζ in the range of 527 ≤ ζ ≤ 2860, maintaining the heat flux of the heated stationary inner cylinder as 80 W/m2, for radius ratio (η) and aspect ratio of the vertical annulus being 0.614 and 0.052, respectively. The problem was investigated numerically using the commercial computational fluid dynamics package, ANSYS CFX. The numerical methodology has been validated by comparing the numerically predicted average surface Nusselt number with experimentally obtained values. The comparison revealed an enhancement of the thermal performance of the heated stationary inner cylinder in the range 527 ≤ ζ ≤ 1190 due to the increase in turbulence intensity towards the heated inner cylinder. However, when the rotation parameter was increased further in the range 1190 ≤ ζ ≤ 2860, the thermal performance of the stationary heated inner cylinder showed only marginal improvement. The aforementioned thermal behavior of the inner heated stationary cylinder has been explored based on the flow statistics gathered from the numerical simulations.}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BenimStegelitzEpple2005, author = {Benim, Ali Cemal and Stegelitz, P. and Epple, Bernd}, title = {Simulation of the two-phase flow in a laboratory coal pulveriser}, series = {Forschung im Ingenieurwesen}, volume = {69}, journal = {Forschung im Ingenieurwesen}, number = {4}, publisher = {Springer Nature}, issn = {0015-7899}, doi = {10.1007/s10010-005-0002-4}, pages = {197 -- 204}, year = {2005}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{KimSchnellScheffknechtetal.2007, author = {Kim, Ju Pyo and Schnell, Uwe and Scheffknecht, G{\"u}nter and Benim, Ali Cemal}, title = {Numerical modelling of MILD combustion for coal}, series = {Progress in Computational Fluid Dynamics}, volume = {7}, journal = {Progress in Computational Fluid Dynamics}, number = {6}, publisher = {Inderscience Publishers}, issn = {1468-4349}, doi = {10.1504/PCFD.2007.014683}, year = {2007}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{EppleFivelandKrohmeretal.2005, author = {Epple, Bernd and Fiveland, Woody and Krohmer, Bernd and Richards, Galen and Benim, Ali Cemal}, title = {Assessment of two-phase flow models for the simulation of pulverized coald combustion}, series = {Clean Air: International Journal on Energy for a Clean Environment}, volume = {6}, journal = {Clean Air: International Journal on Energy for a Clean Environment}, number = {3}, publisher = {Begell House}, issn = {1561-4417}, doi = {10.1615/InterJEnerCleanEnv.v6.i3.50}, pages = {267 -- 287}, year = {2005}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BenimBrillertCagan2004, author = {Benim, Ali Cemal and Brillert, Dieter and Cagan, Markos}, title = {Computational investigation of the flow in pre-swirl stator-rotor systems}, series = {International Journal of Computational Methods}, volume = {1}, journal = {International Journal of Computational Methods}, number = {2}, publisher = {World Scientific}, issn = {0219-8762}, doi = {10.1142/S0219876204000125}, pages = {329 -- 343}, year = {2004}, abstract = {A 3D computational analysis has been applied to investigate direct transfer, pre-swirl systems for gas turbine cooling. Alternative computational procedures have been applied and results have been compared with measurements. Based on these validation studies, strategies for modeling such systems have been proposed. Present results suggest that sufficiently accurate predictions can be obtained using a quasi-steady analysis applying the "frozen rotor" approach for treating the interface between the stationary and rotating domains.}, subject = {Gasturbine}, language = {en} } @article{BenimCaganGuenes2004, author = {Benim, Ali Cemal and Cagan, Markos and G{\"u}nes, Dogan}, title = {Computational analysis of transient heat transfer in turbulent pipe flow}, series = {International Journal of Thermal Sciences}, volume = {43}, journal = {International Journal of Thermal Sciences}, number = {8}, publisher = {Elsevier}, issn = {1290-0729}, doi = {https://doi.org/10.1016/j.ijthermalsci.2004.02.012}, pages = {725 -- 732}, year = {2004}, subject = {Turbulenzmodell}, language = {en} } @article{EppleBenim2003, author = {Epple, B. and Benim, Ali Cemal}, title = {A CRFD study of supercritical 2 x 900 MW boilers for Shanghai, P.R. of China}, series = {Progress in Computational Fluid Dynamics}, volume = {3}, journal = {Progress in Computational Fluid Dynamics}, number = {2-4}, publisher = {Inderscience}, issn = {1468-4349}, doi = {10.1504/PCFD.2003.003772}, pages = {140 -- 144}, year = {2003}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{PasqualottoBenim2001, author = {Pasqualotto, E. and Benim, Ali Cemal}, title = {A new phenomenological modelling approach for diesel engine side injection systems and comparison with computational fluid dynamics}, volume = {1}, number = {1-3}, publisher = {Inderscience}, issn = {1468-4349}, doi = {10.1504/PCFD.2001.001479}, pages = {149 -- 158}, year = {2001}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BenimPasqualotto1998, author = {Benim, Ali Cemal and Pasqualotto, E.}, title = {Investigation into the computational modelling of diesel engine side injection systems}, series = {International Journal of Computer Applications in Technology}, volume = {11}, journal = {International Journal of Computer Applications in Technology}, number = {3-5}, publisher = {Inderscience}, issn = {0952-8091}, doi = {10.1504/IJCAT.1998.062199}, pages = {211 -- 218}, year = {1998}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BenimSyed1998, author = {Benim, Ali Cemal and Syed, Khawar J.}, title = {Laminar flamelet modelling of turbulent premixed combustion}, series = {Applied Mathematical Modelling}, volume = {22}, journal = {Applied Mathematical Modelling}, number = {1-2}, publisher = {Elsevier}, issn = {0307-904X}, doi = {10.1016/S0307-904X(98)00012-2}, pages = {113 -- 136}, year = {1998}, subject = {Verbrennung}, language = {en} } @article{XiaSmithBenimetal.1997, author = {Xia, Jiliang and Smith, Brian L. and Benim, Ali Cemal and Schmidli, Jiirg and Yadigaroglu, George}, title = {Effect of inlet and outlet boundary conditions on swirling flows}, series = {Computers \& Fluids}, volume = {26}, journal = {Computers \& Fluids}, number = {8}, publisher = {Elsevier}, issn = {0045-7930}, doi = {10.1016/S0045-7930(97)00026-1}, pages = {811 -- 823}, year = {1997}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{Benim1990, author = {Benim, Ali Cemal}, title = {Finite element analysis of confined turbulent swirling flows}, series = {International Journal for Numerical Methods in Fluids}, volume = {11}, journal = {International Journal for Numerical Methods in Fluids}, number = {6}, publisher = {Wiley}, issn = {0271-2091}, doi = {10.1002/fld.1650110602}, pages = {697 -- 717}, year = {1990}, abstract = {The finite element method is applied to incompressible and statistically steady confined turbulent swirling flows. A velocity-pressure formulation is employed. The momentum and continuity equations are solved using a segregated algorithm. Two turbulence models, namely the standard κ-ε model and the algebraic stress model, are considered. It is shown that the algebraic stress model leads to significantly more accurate results in swirling flows compared to the κ-ε model. A novel way of implementing the algebraic stress model is presented in which the stresses are coupled to the Navier-Stokes equations in such a way that they 'correct' the effective viscosity hypothesis. This formulation seems to provide a convenient approach for finite elements. In deriving the discretization equations, a streamline-upwind/Petrov-Galerkin method is employed. Comparisons performed between various upwind schemes show that the numerical solution may be substantially affected by the particular upwind procedure used. The analysis is extended to the prediction of particle motion in turbulent swirling flow fields. Here the fluid turbulence is modelled adopting a stochastic approach. The influence of turbulence modelling on particle movement is investigated.}, subject = {Finite-Elemente-Methode}, language = {en} } @article{SuhBenim1989, author = {Suh, S.-H. and Benim, Ali Cemal}, title = {The primitive variables formulation of the Navier-Stokes equations using the finite analytic method}, series = {Applied Mathematical Modelling}, volume = {13}, journal = {Applied Mathematical Modelling}, number = {9}, publisher = {Elsevier}, issn = {0307-904X}, doi = {10.1016/0307-904X(89)90066-8}, pages = {550 -- 554}, year = {1989}, subject = {Navier-Stokes-Gleichung}, language = {en} } @article{BenimZinserSchnell1989, author = {Benim, Ali Cemal and Zinser, Walter and Schnell, Uwe}, title = {Investigation into the finite element analysis of enclosed turbulent diffusion flames}, series = {Applied Mathematical Modelling}, volume = {13}, journal = {Applied Mathematical Modelling}, number = {5}, publisher = {Elsevier}, issn = {0307-904X}, doi = {10.1016/0307-904X(89)90069-3}, pages = {258 -- 267}, year = {1989}, subject = {Finite-Elemente-Methode}, language = {en} } @article{Benim1989, author = {Benim, Ali Cemal}, title = {Finite element solution of an enclosed turbulent diffusion flame}, series = {International Journal for Numerical Methods in Fluids}, volume = {9}, journal = {International Journal for Numerical Methods in Fluids}, number = {3}, publisher = {Wiley}, issn = {0271-2091}, doi = {10.1002/fld.1650090305}, pages = {289 -- 303}, year = {1989}, abstract = {A finite element formulation of enclosed turbulent diffusion flames is presented. A primitive variables approach is preferred in the analysis. A mixed interpolation is employed for the velocity and pressure. In the solution of the Navier-Stokes equations, a segregated formulation is adopted, where the pressure discretization equation is obtained directly from the discretized continuity equation, considering the velocity-pressure relationships in the discretized momentum equations. The state of turbulence is defined by a κ-ϵ model. Near solid boundaries, a wall function approach is employed. The combustion rates are estimated using the eddy dissipation concept. The expensive direct treatment of the integrodifferential equations of radiation is avoided by employing the moment method, which allows the derivation of an approximate local field equation for the radiation intensity. The proposed finite element model is verified by investigating a technical turbulent diffusion flame of semi-industrial size, and comparing the results with experiments and finite difference predictions.}, subject = {Finite-Elemente-Methode}, language = {en} } @article{Benim1988, author = {Benim, Ali Cemal}, title = {A finite element solution of radiative heat transfer in participating media utilizing the moment method}, series = {Computer Methods in Applied Mechanics and Engineering}, volume = {67}, journal = {Computer Methods in Applied Mechanics and Engineering}, number = {1}, publisher = {Elsevier}, issn = {0045-7825}, doi = {10.1016/0045-7825(88)90065-5}, pages = {1 -- 14}, year = {1988}, subject = {Finite-Elemente-Methode}, language = {en} } @article{BenimZinser1986, author = {Benim, Ali Cemal and Zinser, Walter}, title = {A segregated formulation of Navier-Stokes equations with finite elements}, series = {Computer Methods in Applied Mechanics and Engineering}, volume = {57}, journal = {Computer Methods in Applied Mechanics and Engineering}, number = {2}, publisher = {Elsevier}, issn = {0045-7825}, doi = {10.1016/0045-7825(86)90015-0}, pages = {223 -- 237}, year = {1986}, subject = {Navier-Stokes-Gleichung}, language = {en} } @article{BenimZinser1985, author = {Benim, Ali Cemal and Zinser, Walter}, title = {Investigation into the finite element analysis of confined turbulent flows using a κ-ε model of turbulence}, series = {Computer Methods in Applied Mechanics and Engineering}, volume = {51}, journal = {Computer Methods in Applied Mechanics and Engineering}, number = {1-3}, publisher = {Elsevier}, issn = {0045-7825}, doi = {10.1016/0045-7825(85)90045-3}, pages = {507 -- 523}, year = {1985}, subject = {Finite-Elemente-Methode}, language = {en} } @unpublished{SulaimanSaberHasanetal.2024, author = {Sulaiman, Mohammed Abdulqader and Saber, Hindren Ali and Hasan, Hasan Fahmi and Benim, Ali Cemal}, title = {Experimental and Numerical Investigation of Novel Dew-Point Evaporative Cooler with Shell and Tube Design}, series = {SSRN}, journal = {SSRN}, publisher = {Elsevier}, doi = {10.2139/ssrn.4980477}, pages = {38}, year = {2024}, abstract = {Implementing a neoteric practical design for dew-point evaporative cooler (DPEC) rather than the widely utilized flat plate and corrugated plate has been challenging since the first invention. Thus far, no study has been dedicated to design and experimentally implement a shell and tube concept for DPEC with an innovative configuration that can contribute in mass production, globalization, and effortless maintenance of such a high performance cooling machine. Therefore, in this paper, the shell and tube concept has been employed as a core design for DPEC that has been reinforced by a practical approaches. The practical approaches include a dedicated novel design for the proposed system and utilizing super cheap materials for the system's construction. Both of the aforementioned approaches provide solutions for overcoming the aforementioned issues. In the meanwhile, the superiority of the proposed DPEC has been approved by comparing it to the flat plate DPEC. During the experimentations, the prototype was able to reduce the ambient temperature by up to 34.1°C (from 53°C to 18.9°C), besides, it could achieve a dew-point effectiveness of 99.6\% and wet-bulb effectiveness of 135\%.}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BaşaranBenim2024, author = {Ba{\c{s}}aran, An{\i}l and Benim, Ali Cemal}, title = {Development of Correlations Based on CFD Study for Microchannel Condensation Flow of Environmentally Friendly Hydrocarbon Refrigerants}, series = {Energies}, volume = {17}, journal = {Energies}, number = {7}, publisher = {MDPI}, issn = {1996-1073}, doi = {10.3390/en17071531}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-46398}, pages = {21}, year = {2024}, abstract = {A CFD simulation of the condensation flow of R600a and R290 within microchannels was conducted to explore the effect of mass flux, hydraulic diameter, and vapour quality on heat transfer rate and pressure drop. Data obtained from CFD simulations were used to develop new heat transfer and pressure drop correlations for the condensation flows of R600a and R290, which are climate-friendly refrigerants. Steady-state numerical simulations of condensation flow of refrigerants were carried out inside a single circular microchannel with diameters varying between 0.2 and 0.6 mm. The volume of fluid approach was used in the proposed model, calculating the interface phase change using the Lee model. The CFD simulation model was validated via a comparison of the simulation results with the experimental data available in the literature. It is found that the newly developed Nu number correlation shows a deviation, with an Ave-MAE of 11.16\%, compared to those obtained by CFD simulation. Similarly, the deviation between friction factors obtained by the newly proposed correlation and those obtained by CFD simulation is 20.81\% Ave-MAE. Widely recognized correlations that are applicable to the condensation of refrigerants within small-scale channels were also evaluated by comparing newly developed correlations. It is concluded that the newly proposed correlation has a higher accuracy in predicting the heat transfer coefficient and pressure drop. This situation can contribute to the creation of a sustainable system via the use of microchannels and climate-friendly refrigerants, like R600a and R290.}, subject = {Druckabfall}, language = {en} } @article{ZenginErdoğanBenim2024, author = {Zengin, İbrahim and Erdoğan, Beytullah and Benim, Ali Cemal}, title = {CFD and Taguchi based optimization of air driven single stage partial admission axial turbine blade profiles}, series = {Energy}, volume = {290}, journal = {Energy}, publisher = {Elsevier}, issn = {0360-5442}, doi = {10.1016/j.energy.2024.130333}, pages = {13}, year = {2024}, subject = {Taguchi-Methode}, language = {en} } @article{RueckertIbrarAhmedetal.2024, author = {R{\"u}ckert, Frank Ulrich and Ibrar, Burhan and Ahmed, Arslan and Allweyer, Benjamin and H{\"u}bner, Dirk and Klinger, Friedrich and Knaus, Hermann and Benim, Ali Cemal}, title = {Fluid flow and heat transfer of a novel passive cooling system for gearless wind turbines with a power range of 3-12 MW}, series = {Energy}, volume = {312}, journal = {Energy}, publisher = {Elsevier}, issn = {0360-5442}, doi = {10.1016/j.energy.2024.133478}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-46594}, year = {2024}, abstract = {Today, the gearless horizontal axis wind turbines are mainstream in wind energy industry. High demands of electric power led to bigger systems and active cooling reduces the overall efficiency of the turbines. Passive cooling systems have been examined for the first time for a gearless wind energy generator with power range of 3-12 MW. With further developed heat conductors, it is possible to operate a wind generator in a larger power class with passive cooling components. This is accompanied by enormous cost savings due to elimination of costs for active cooling elements such as the use of fans, pumps, and heat exchangers. An additional factor is the significant reduction in necessary maintenance due to the minimized incidence of corrosion and wear. Design of the cooling fins and an ideal position of the generator within the housing of the wind turbine has been objectives. Mandatory is that maximum temperatures of the generator fins should stay under 155 °C, which could be reached with several designs for different heat exchanger geometries.}, subject = {Windturbine}, language = {en} }