Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"turbulent effects"”.
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Numerische Simulation des Wärmeübergangs in einer kryogenen Raketenbrennkammer
… regenerative cooled wall. The heat transfer in turbulent flow is a result of turbulent vortices and the heat conductivity of the fluid. The turbulent effects were represented by the q-omega Low-Reynolds turbulence model, while the gas mixture and real gas effects werde considered in the gas …
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A theoretical investigation of an averaged-structure eddy viscosity model applied to turbulent shear flows
… of turbulence is described by averaging the effects of the eddies of various scales over the whole volume of flow. The model assumes that the turbulent stresses can be presented in a way analogous to the laminar stresses and the correlations between the point in question with those at other …
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On the stability of rotor bearing systems based on Hopf bifurcation theory
… of rotor-bearing systems with consideration of turbulent effects are evaluated by applying the Hopf bifurcation theory (HBT) to the equations of motion. A method is developed for predicting the stability envelope of rotor-bearing systems using HBT. Results are compared with published literature …
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Unstructured mesh - finite volume algorithms for swirling, turbulent, reacting flows
… code which is capable of solving swirling, turbulent fluid flow and reactive, radiative heat transfer on highly complex geometries. Specifically the techniques are applied to the simulation of processes occurring in the direct smelting of iron. The use of the Finite Volume method makes it …
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The Effect of Anomalous Resistivity on the Electrothermal Instability
… is an avenue by which these collision-less micro-turbulent effects can be incorporated into a collisional resistivity. AR directly changes the resistivity which will directly modify the linear growth rate of ETI, so a new linear growth rate is derived which includes AR's added dependency on …
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MRI Studies of Gas Hydrodynamics in Automotive Particulate Filters
… filters. The first measurements of laminar and turbulent flows at the filter entrance and exit are made. These show the features expected from literature simulations but also additional turbulent effects not previously predicted. Possible challenges facing future CFD comparisons with this work …
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Experimental analysis of flow and turbulence characteristics in oscillatory boundary layers from LDV measurements
… of the laminar regime and the lower limit of the turbulent regime (3x104 < Rew < 9x105). A 3D laser Doppler velocimetry (LDV) system was used to measure instantaneous flow velocities with high spatial and temporal resolution, which allowed capturing flow features with great detail inside the …
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An experimental test for the existence of the Euler wake velocity, validating Eulerlet theory by using a bluff body in a low-speed wind tunnel
… large Reynolds number such that the flow is not turbulent, and the boundary layer is negligibly small and the impermeability boundary condition holds. Instead of using standard techniques and theory for describing the problem, a new method is employed based upon the concept of matching two …
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Geometry mediated drag reduction using riblets and wrinkled surface textures
… of the flow in the grooves (both laminar and turbulent) and the displacement of vortical structures away from the wall in turbulent flows. Due to their effectiveness in altering the boundary layer structure and reducing the viscous drag force, use of riblets have been banned in various …