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User defined boundary conditions on a surface

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Old   November 24, 2015, 14:23
Default User defined boundary conditions on a surface
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Hi, I am doing a 2D numerical simulation of a SBLI at a freestream Mach number of 6. A shock is created by a wedge of angle 31.0 deg which impinges on a flat plate. Separation is expected to occur on the flat plate due to the high imposed adverse pressure gradient by the wedge shock. As for the simulation in CFX, I have created a rectangular geometry (100 mm X 40 mm) having specified the boundary conditions as follows:
1. Left face: INLET from the freestream (p=p_infty, u_x=u_infty, u_y=0, T=T_infty)
2. Right face : OUTLET supersonic
3. Bottom face : No-slip wall with constant temperature at 300 K
4. Top face : User defined boundary condition defined by,
for x < x0; p=p_infty, u_x=u_infty, u_y=0, T=T_infty
else; p=p1, u_x=u_x1, u_y=u_y1, T=T_1

The variables mentioned above are the conditions before and after the wedge shock. Running this simulation the solution is crashing having a max. Mach number of 1.5E+04, which is unphysical. Am I doing the simulation right? Need help. Thanks.
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Old   November 24, 2015, 18:29
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This is related to this FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F
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2d rectangular, aspect ratio 1 meshing, hypersonic

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