Direct simulations of wallbounded compressible turbulence
Abstract
A study has been initiated on the effects of compressibility (Mach number) on turbulent boundary layers. An understanding of both qualitative (turbulence structures, physical processes) and quantitative (turbulence statistics) effects are desired. This understanding should lead to better turbulence models for applications involving supersonic wallbounded flows. Direct numerical simulations of an idealized problem will be used to accomplish these objectives. Among several possibilities we chose plane Couette flow with constanttemperature walls as the first problem to be studied. The lack of mean streamwise pressure gradient plus isothermal walls implies that both horizontal directions can be assumed to be homogeneous and that the flow can reach a statistically steady state. Together, these features greatly simplify the calculations and analyses of the results. To date, an algorithm has been developed and implemented (but not yet fully tested) for the accurate solution of the NavierStokes equations with the assumptions noted above.
 Publication:

Annual Research Briefs, 1989
 Pub Date:
 February 1990
 Bibcode:
 1990arb..nasa..169B
 Keywords:

 Compressibility;
 Computerized Simulation;
 Supersonic Flow;
 Turbulence;
 Turbulence Effects;
 Turbulence Models;
 Turbulent Boundary Layer;
 Algorithms;
 Couette Flow;
 Mach Number;
 NavierStokes Equation;
 Pressure Gradients;
 Reynolds Number;
 Wall Flow;
 Fluid Mechanics and Heat Transfer