@phdthesis{Meincke, author = {Meincke, Oliver}, title = {3D-Strukturen und Dynamik im asymmetrischen Taylor-Couette-System}, publisher = {Cuvillier-Verlag}, address = {G{\"o}ttingen}, isbn = {3-89873-492-7}, abstract = {Dissertation und Endbericht eines DFG-Projektes unter Leitung von Prof. Egbers}, language = {de} } @phdthesis{Richter, author = {Richter, J{\"o}rg}, title = {Computersimulationsexperimente zur Untersuchung prozessrelevanter Flockenstruktureigenschaften unter besonderer Ber{\"u}cksichtigung der Flockungskinetik}, publisher = {Shaker Verlag}, address = {Aachen}, isbn = {3-8322-1391-0}, language = {de} } @phdthesis{Shen, author = {Shen, Jianqi}, title = {Particle Size Analysis by Transmission Fluctuation Spectrometry: Fundamentals and Case Studies}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {3-89873-946-5}, language = {en} } @phdthesis{Junk, author = {Junk, Markus}, title = {Numerische Untersuchung der Stabilit{\"a}t der Str{\"o}mung im weiten Kugelspalt}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttngen}, isbn = {3-86537-345-3}, language = {de} } @phdthesis{Futterer, author = {Futterer, Birgit}, title = {Experimentelle und numerische Untersuchungen von Kugelspaltstr{\"o}mungen}, publisher = {VDI-Verl.}, address = {D{\"u}sseldorf}, isbn = {3-18-348507-9}, language = {de} } @phdthesis{Larcher, author = {Larcher, Thomas von}, title = {Zur Stabilit{\"a}t barokliner Wellen im starr rotierenden Zylinderspalt}, publisher = {VDI-Verl.}, address = {D{\"u}sseldorf}, isbn = {3-18-348607-6}, language = {de} } @phdthesis{Smieszek, author = {Smieszek, Marlene}, title = {Structures and stability of Newtonian and non-Newtonian fluids in Taylor-Couette system}, publisher = {D{\"u}sseldorf : VDI-Verl}, isbn = {978-3-18-349107-0}, language = {en} } @phdthesis{Butt, author = {Butt, Usman}, title = {Experimental investigation of the flow over macroscopic hexagonal structured surfaces}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-30555}, language = {en} } @phdthesis{Dahley, author = {Dahley, Norman}, title = {Dielectrophoretic flow control of thermal convection in cylindrical geometries}, publisher = {Cuvillier}, address = {G{\"o}ttingen}, isbn = {978-3-95404-863-2}, pages = {IX, 171}, language = {en} } @phdthesis{Seelig, author = {Seelig, Torsten}, title = {Inertial wave propagation, focusing and mean flow excitation : theory and experiments}, publisher = {Cuvillier}, address = {G{\"o}ttingen}, isbn = {978-3-95404-793-2}, pages = {XIII, 113}, language = {en} } @phdthesis{Motuz, author = {Motuz, Vasyl}, title = {Gleichm{\"a}ßiges Mikro-Ausblasen zur Beeinflussung einer turbulenten Grenzschicht}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-31242}, pages = {137}, language = {de} } @phdthesis{Christl, author = {Christl, Andreas}, title = {3D-CFD-Simulation der exzentrischen Taylor-Couette Str{\"o}mung mit Bezug auf das hydrodynamische Gleitlager}, publisher = {Cuvillier}, address = {G{\"o}ttingen}, isbn = {978-3-73699-081-4}, pages = {II, 109}, language = {de} } @phdthesis{Koenig, author = {K{\"o}nig, Franziska}, title = {Investigation of High Reynolds Number Pipe Flow}, publisher = {Cuvillier}, address = {G{\"o}ttingen}, isbn = {978-3-73699-049-4}, language = {en} } @phdthesis{Dahley, author = {Dahley, Sandy}, title = {Laboratory experiments and numerical simulations of inertial waves in a rotating spherical shell}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-73699-198-9}, language = {en} } @phdthesis{Hoff, author = {Hoff, Michael}, title = {Stewartson layers, inertial waves and wave instabilities in a spherical-gap flow: Laboratory experiments with full optical acces}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-7369-9644-1}, language = {en} } @phdthesis{Oenguener, author = {{\"O}ng{\"u}ner, Emir}, title = {Experiments in Pipe Flows at Transitional and Very High Reynolds Numbers}, publisher = {G{\"o}ttingen}, address = {Cuvillier Verlag}, isbn = {978-3-73699-783-7}, pages = {xxix, 128}, language = {en} } @phdthesis{Merbold, author = {Merbold, Sebastian}, title = {Experimental investigation on turbulent transport in Taylor-Couette flow}, edition = {1. Auflage}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-7369-7068-7}, pages = {xxviii, 173}, language = {en} } @phdthesis{Froitzheim, author = {Froitzheim, Andreas}, title = {Angular momentum transport and pattern formation in medium- and wide-gap turbulent Taylor-Couette flow : an experimental study}, edition = {1. Auflage}, publisher = {Cuvilier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-7369-7073-1}, pages = {xxiii, 144}, language = {en} } @phdthesis{Neben, author = {Neben, Matthias}, title = {3D-CFD der Gas-Partikel-Str{\"o}mung in einer Laval-D{\"u}se zur Vorhersage mechanischer Erosion}, address = {Cottbus}, pages = {138}, language = {de} } @phdthesis{Jongmanns, author = {Jongmanns, Marcel}, title = {Flow control of thermal convection using thermo electro hydrodynamic forces in a cylindrical annulus}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-7369-7044-1}, pages = {x, 160}, language = {en} } @phdthesis{MalteseMelettideOliveira, author = {Maltese Meletti de Oliveira, Gabriel}, title = {High-performance computing and laboratory experiments on strato-rotational instabilities}, address = {Cottbus}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-54408}, pages = {155}, language = {en} } @phdthesis{Xu, author = {Xu, Wenchao}, title = {Experiments on nonlinear waves in homogeneous flows with free upper surface and time-dependent forcing}, address = {Cottbus}, doi = {10.26127/BTUOpen-5386}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-53860}, pages = {148}, language = {en} } @phdthesis{Hallol, author = {Hallol, Zeinab}, title = {Behaviour of energetic coherent structures in turbulent pipe flow at high Reynolds numbers}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-7369-7501-9}, pages = {146}, language = {en} } @phdthesis{Hasanuzzaman, author = {Hasanuzzaman, Gazi}, title = {Experimental investigation of turbulent boundary layer with uniform blowing at moderate and high Reynolds numbers}, publisher = {BTU}, address = {Cottbus-Senftenberg}, doi = {10.26127/BTUOpen-5566}, pages = {XXIII, 152}, abstract = {Experimental investigation in turbulent boundary layer flows represents one of the canonical geometries of wall bounded shear flows. Utmost relevance of such experiments, however, is applied in the engineering applications in aerospace and marine industries. In particular, continuous effort is being imparted to explore the underlying physics of the flow in order to develop models for numerical tools and to achieve flow control. Within the scope of this Ph. D. topic, application of active control method such as micro-blowing effect in the incompressible, zero pressure gradient turbulent boundary layer was investigated. Turbulent boundary layer flow is particularly interesting as well as challenging due to the presence of different interacting scales which are increasingly becoming significant as the flow inertial conditions keeps growing. Therefore, energy content of the coherent structures in outer layer becomes stronger and necessitates measurements in relatively large Reynolds number. Present control experiments in turbulent boundary layer can be split into two different work segments, where one is objected towards the data measurements in turbulent boundary layer over smooth surface with and without any external perturbation. Here, perturbation is applied in the form of wall normal blowing while keeping the magnitude of blowing very low compared to the free stream velocity. For the subsequent results reported here, magnitude of blowing ratio was varied between 0\%~6\%. In the first part of the present thesis e.g. 0.415×10e+3≤Reτ≤1.160×10e+3, measurements were performed at the Brandenburg University of Technology wind tunnel. Non-intrusive Laser Doppler Anemometry was applied to carry out a series of measurements on a zero pressure gradient flat plate turbulent boundary layer. Blowing ratio through the perforated surface was varied between 0.17\%~1.52\% of the free stream velocity. To a maximum of 50\% reduction in friction drag was achieved. For the measurements on the upper range of the stated Reynolds number, were conducted at the boundary layer wind tunnel. This boundary layer wind tunnel offers a spatially developed turbulent boundary layer over a flat plate within 2.2×10e+3≤Reτ≤5.5×10e+3 with an excellent spatial resolution. With the help of Stereo Particle Image Velocimetry technique, measurement of the velocity components were obtained covering entire boundary layer in streamwise wall normal plane. In addition, time resolved measurements were also obtained in spanwise and wall-normal plane in order to look into the morphology of turbulent structures immediately above the blowing area.}, language = {en} } @phdthesis{Rodda, author = {Rodda, Costanza}, title = {Gravity wave emission from jet systems in the differentially heated rotating annulus experiment}, edition = {1. Auflage}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-7369-7110-3}, pages = {xvi, 180}, language = {en} } @phdthesis{Hamede, author = {Hamede, Mohammed Hussein Haytham}, title = {The turbulent very wide-gap Taylor-Couette flow : experimental investigation}, doi = {10.26127/BTUOpen-6445}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-64456}, language = {en} } @phdthesis{Shahirpour, author = {Shahirpour, Amir}, title = {A characteristic dynamic mode decomposition to detect transport-dominated large-scale coherent structures in turbulent wall-bounded flows}, doi = {10.26127/BTUOpen-6958}, pages = {xxxv, 157}, language = {en} } @phdthesis{Schoen, author = {Sch{\"o}n, Franz-Theo}, title = {Transport and waves in parametrically excited fluid layers}, publisher = {Brandenburgische Technische Universit{\"a}t}, address = {Cottbus ; Senftenberg}, doi = {10.26127/BTUOpen-6995}, pages = {xvi, 133}, abstract = {The transport and waves in parametrically excited fluid layers play a significant role in an understanding of non-linear surface wave phenomena and tidal resonances. In this thesis, we study resonant waves occurring in a circular channel with various obstacles under external oscillatory excitation. Typically, such sloshing experiments are conducted in rectangular, straight channels. The external excitation is implemented using a rotating table on which the entire experiment, including measurement equipment, is mounted. The excitation is either sinusoidal or ratched motion. The obstacles include a fully blocking barrier and a symmetric or asymmetric hill. The channel circumference is 4.76 m, with water depths ranging from 2 cm to 6 cm. Wave displacements within the channel are measured using 17 ultrasonic sensors equidistantly distributed along half of the channel. Particle Image Velocimetry (PIV) is employed to measure the flow. We also consider a simplified numerical model capable of reproducing the experimental results. This model is based on a long-wave approximation and vertical integration using a profile function (K{\´a}rm{\´a}n-Pohlhausen approach). Additionally, we use a wave attractor model to quantitatively explain the development of resonances. These resonances are distributed in bands of the excitation frequency around the linear eigenfrequency. The experimental wave attractor and numerical results are consistent with each other. The waves observed within these resonant frequency bands appear as undular bores or solitary waves. In the fully blocking case, bands of constructive and destructive interference are observed, while in the presence of hills, all eigenfrequencies exhibit resonances of varying intensity. These non-linear wave phenomena are characterized by strong transport properties, which can be studied here due to the fact that the circular channel is not fully blocked. The ratched excitation generated asymmetric wave fields, which also induced asymmetric transport in the channel, leading to the emergence of a mean flow in the channel. A similar mean channel flow is observed for the asymmetric hill; however, wave-induced transport played a lesser role in this case. This is attributed to a large separation vortex on the steep side of the hill, which created a valve effect that rectified part of the oscillatory flow. These results are of interest not only for engineering applications but also for the understanding of tidal flows over seabed topography.}, language = {en} } @phdthesis{Haun, author = {Haun, Peter}, title = {Modelling of thermo-electro hydrodynamic (TEHD) convection}, edition = {1st edition}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-689-52666-5}, doi = {10.61061/ISBN_9783689526665}, pages = {XXIV, 369}, abstract = {In Thermo-Electro Hydrodynamics (TEHD), an electric field is applied to a fluid within a heated domain to induce thermal convection. The fluid and the electric field must meet specific conditions to establish a dielectrophoretic force that acts as a buoyancy force on the fluid. This buoyancy force is utilised in experiments to replicate gravitational buoyancy, explore resulting flow structures, or develop heat transfer systems without moving parts. In this study, the electric force field acting on a dielectric fluid in a capacitor is derived from the Maxwell equations and coupled with the Navier-Stokes equation for fluid motion. Furthermore, an Open Source Field Operation and Manipulation (OpenFOAM) solver is extended to incorporate TEHD momentum and energy-contributing terms. In a dimensional analysis, dimensionless parameters are derived and tested. Therefore, parameter studies in 2D approximations of planar and cylindrical geometries are done. Additionally, the 2D investigations are utilised to study the behaviour of heat transfer and boundary layer properties, and some scaling laws are derived. Finally, 3D spherical shell microgravity experiments are analysed and linked to the results of 3D numerical analysis. The results verify the derived methods, which are expanded and applied to the upcoming space experiment, AtmoFlow.}, language = {en} }