Langley Research Center Turbulence Modeling Resource

2D Zero Pressure Gradient Flat Plate Verification Case - Intro Page

The purpose here is to provide a large sequence of nested grids of the same family, along with results from existing CFD codes that employ specific forms of particular turbulence models, in order to help programmers verify their implementations of these same models. On a given grid, there may be differences between the results from different codes, but presumably as the grid is refined the results should approach the same answer (if the flow conditions and boundary conditions are the same). With verification, the purpose is not to establish the "goodness" of a model compared to experiment, but rather to establish that a model has been implemented correctly, as intended according to the equations and boundary conditions. (It is through validation that a model's "goodness" is established.) Because the purpose here is primarily verification, experiment is not specifically looked at, although law-of-the-wall theory is included for the sake of reference.

The turbulent flat plate case was run at essentially incompressible conditions: M = 0.2, at a Reynolds number of Re = 5 million based on length "1" of the grid. Because the solid wall of the grid extended from x = 0 to x = 2, this means that the Re_x at x=1 was 5 million, and Re_x at x=2 (the downstream end of the plate) was 10 million. The following plot shows the layout of the simple flat plate grids used for this study, along with the boundary conditions. (Note that particular variations of the BCs at the inflow, top wall, and outflow may also work and yield similar results for this problem.)

• GRIDS
• SA EXPECTED RESULTS
• SST-V EXPECTED RESULTS