Untersuchungen zur Dynamik von Wirbelschleppen in der atmosphaerischen Grenzschicht
Germany
3D fluid simulations of tokamak edge turbulence
Germany
Computation of the three-dimensional viscid flow in rows of turbine cascades Final report / Berechnung der dreidimension...
The target of the project was a computer code for the simulation of threedimensional, turbulent, compressible, transonic flows in cascade rows. With such a computational method it is possible to improve the conventional quasi threedimensional simulation considerably. First the generation of threedimensinal, structured, boundary fitted, orthogonal m...
Meridional flow calculation for multiple stage turbines Final report / Meridianstroemungsverfahren fuer mehrstufige Turb...
The design and analysis of multiple stage turbines demand modern calculation methods providing a detailed view of the flow through the turbine. Two-dimensional calculations which are under development since the seventies are nowadays well established. Despite the availability of three-dimensional calculation methods they are still a main part of th...
Experimentelle und theoretische Untersuchungen an ein- und zweikanaligen Ringdiffusoren hinter einem offenen Ringraum un...
Germany
Gravity-wave drag in 3-dimensional atmospheric models of mars
Stochastic backscatter of turbulence energy and scalar variance by random subgrid-scale fluxes
For large-eddy simulation with a finite-difference scheme, a simple stochastic subgrid-scale (SGS) model is introduced which describes the effects of random SGS motions on the resolved (filtered) scales of incompressible turbulent motions. The model extends the Smagorinsky-Lilly model by adding realizable random stresses and fluxes which are constr...
On the propagation of thermonuclear flames in type Ia supernovae
The following topics were dealt with: Type Ia supernovae problems, physicalproperties and subsonic burning fronts, piecewise scale-invariant burning regimes, shear instability of laminar flames, modelling of turbulent flame fronts, turbulent front propagation in white dwarfs, numerical method, implementation of the supergrid model / Available from ...
Broadening of convective cells
The turbulent convection of a dry Boussinesq fluid above a heated surfrace is investigated in a domain of a large aspect ratio (16:1) and for long times (100 convective time units). Our study investigates the influence of the dynamical character of the lower boundary and the effect of cooling at the top of the domain on the growth of convective cel...
Influence of aerodynamics on the heat absorption of convection cooled turbine blades Final report / Einfluss der Aerodyn...
Ziel des Vorhabens ist daher die Zusammenfuehrung der aerodynamischen und thermischen Auslegung am Beispiel konvektionsgekuehlter Turbinenschaufeln. Dazu soll in einem ersten Teil des Vorhabens ein Grenzschichtrechenverfahren weiterentwickelt werden, das die Berechnung des Waermeuebergangs und der stroemungsmechanischen Verluste konvektionsgekuehlt...
