TY - JOUR A1 - Benim, Ali Cemal A1 - Zinser, Walter T1 - Investigation into the finite element analysis of confined turbulent flows using a κ-ε model of turbulence JF - Computer Methods in Applied Mechanics and Engineering KW - Finite-Elemente-Methode KW - Turbulente Strömung KW - Numerische Strömungssimulation Y1 - 1985 U6 - https://doi.org/10.1016/0045-7825(85)90045-3 SN - 0045-7825 VL - 51 IS - 1-3 SP - 507 EP - 523 PB - Elsevier ER - TY - JOUR A1 - Benim, Ali Cemal A1 - Zinser, Walter T1 - A segregated formulation of Navier-Stokes equations with finite elements JF - Computer Methods in Applied Mechanics and Engineering KW - Navier-Stokes-Gleichung KW - Turbulente Strömung KW - Finite-Elemente-Methode KW - Numerische Strömungssimulation Y1 - 1986 U6 - https://doi.org/10.1016/0045-7825(86)90015-0 SN - 0045-7825 VL - 57 IS - 2 SP - 223 EP - 237 PB - Elsevier ER - TY - JOUR A1 - Benim, Ali Cemal T1 - A finite element solution of radiative heat transfer in participating media utilizing the moment method JF - Computer Methods in Applied Mechanics and Engineering KW - Finite-Elemente-Methode KW - Wärmeübertragung KW - Wärmestrahlung KW - Momentenmethode KW - Numerische Strömungssimulation Y1 - 1988 U6 - https://doi.org/10.1016/0045-7825(88)90065-5 SN - 0045-7825 VL - 67 IS - 1 SP - 1 EP - 14 PB - Elsevier ER - TY - JOUR A1 - Benim, Ali Cemal T1 - Finite element solution of an enclosed turbulent diffusion flame JF - International Journal for Numerical Methods in Fluids N2 - 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. KW - Finite-Elemente-Methode KW - Turbulente Diffusionsflamme KW - Navier-Stokes-Gleichung KW - Numerische Strömungssimulation Y1 - 1989 U6 - https://doi.org/10.1002/fld.1650090305 SN - 0271-2091 VL - 9 IS - 3 SP - 289 EP - 303 PB - Wiley ER - TY - JOUR A1 - Benim, Ali Cemal A1 - Zinser, Walter A1 - Schnell, Uwe T1 - Investigation into the finite element analysis of enclosed turbulent diffusion flames JF - Applied Mathematical Modelling KW - Finite-Elemente-Methode KW - Turbulente Diffusionsflamme KW - Navier-Stokes-Gleichung KW - Numerische Strömungssimulation Y1 - 1989 U6 - https://doi.org/10.1016/0307-904X(89)90069-3 SN - 0307-904X VL - 13 IS - 5 SP - 258 EP - 267 PB - Elsevier ER - TY - JOUR A1 - Suh, S.-H. A1 - Benim, Ali Cemal T1 - The primitive variables formulation of the Navier-Stokes equations using the finite analytic method JF - Applied Mathematical Modelling KW - Navier-Stokes-Gleichung KW - Finite analytische Methode KW - Numerische Strömungssimulation Y1 - 1989 U6 - https://doi.org/10.1016/0307-904X(89)90066-8 SN - 0307-904X VL - 13 IS - 9 SP - 550 EP - 554 PB - Elsevier ER - TY - JOUR A1 - Benim, Ali Cemal T1 - Finite element analysis of confined turbulent swirling flows JF - International Journal for Numerical Methods in Fluids N2 - 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. KW - Finite-Elemente-Methode KW - Turbulente Strömung KW - Navier-Stokes-Gleichung KW - Numerische Strömungssimulation Y1 - 1990 U6 - https://doi.org/10.1002/fld.1650110602 SN - 0271-2091 VL - 11 IS - 6 SP - 697 EP - 717 PB - Wiley ER - TY - JOUR A1 - Hesse, Jan A1 - König, Rainer A1 - Logi, Filippo A1 - Herder, Jens T1 - A Prototype of an Interface Builder for the Common Lisp Interface Manager - CLIB JF - ACM Sigplan Notices N2 - The Common Lisp Interface Manager (CLIM) is used to develop graphical user interfaces for Lisp-basedapplications. With the prototype of the CLIM interface Builder (CLIB) the programmer can generate code for CLIM interactively. The developing process will be fast and less prone to errors. With this new tool, the interactive rapid prototyping reduces costs of a specification phase. Here we present the concept and first results of the prototype of CLIB. Y1 - 1993 U6 - https://doi.org/10.1145/163114.163116 VL - 28 IS - 8 SP - 19 EP - 28 PB - Forschungszentrum Informatik (FZI), Technical Expert Systems and Robotics ER - TY - JOUR A1 - Benim, Ali Cemal A1 - Neuhoff, H. G. T1 - Analysis of erosion behaviour in a turbocharger radial turbine JF - International Journal for Numerical Methods in Fluids N2 - An analysis of the erosion behaviour of a turbocharger radial turbine is presented. The solution domain includes both sides of the radial turbine scroll with double intake and the rotor channel. In the analysis a dilute gas‐particle flow assumption is employed. The gas turbulence is defined by the k‐ε model. In solving the gas phase equation, the computer code Harwell‐FLOW3D is employed, which is based on a finite volume formulation using non‐orthogonal body‐fitted structured gridding and a pressure correction method. The particle phase is described by a Lagrangian approach, while particle paths are computed deterministically, neglecting the turbulent dispersion. For the computation of particle trajectories the code PTRACK is employed, which has been developed at ABB. Computations are carried out for several particle size classes. The results show that particles are thrown back into the scroll by the rotor at high rates. This seems to be the main source of erosion effects in the scroll. It has been observed that particles are unequally distributed between the scroll sides on their re‐entry, resulting in greater erosion on one of the scroll sides. The maximum erosion along the scroll is found to be likely to occur near the scroll end. KW - Erosion KW - Abgasturbolader KW - Radialturbine Y1 - 1993 U6 - https://doi.org/10.1002/fld.1650160402 SN - 0271-2091 VL - 16 IS - 4 SP - 259 EP - 285 PB - Wiley ER - TY - JOUR A1 - Kunii, Tosiyasu L. A1 - Herder, Jens A1 - Myszkowski, Karol A1 - Okunev, Oleg A1 - Okuneva, Galina A1 - Ibusuki, Masumi T1 - Articulation Simulation for an Intelligent Dental Care System JF - Displays N2 - CAD/CAM techniques are used increasingly in dentistry for design and fabrication of teeth restorations. An important issue is preserving occlusal contacts of teeth after restoration. Traditional techniques based on the use of casts with mechanical articulators require manual adjustment of occlusal surface, which becomes impractical when hard restoration materials like porcelain are used; they are also time and labor consuming. Most existing computer systems ignore completely such an articulation check, or perform the check at the level of a tooth and its immediate neighbors. We present a new mathematical model and a related user interface for global articulation simulation, developed for the Intelligent Dental Care System project. The aim of the simulation is elimination of the use of mechanical articulators and manual adjustment in the process of designing dental restorations and articulation diagnostic. The mathematical model is based upon differential topological modeling of the jawbs considered as a mechanical system. The user interface exploits metaphors that are familiar to dentists from everyday practice. A new input device designed specifically for use with articulation simulation is proposed. Y1 - 1994 VL - 15 IS - 3 SP - 181 EP - 188 ER -