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April 27, 2010, 23:22 |
Wall pressure interpolation for buoyant flow
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#1 |
New Member
KaySee
Join Date: Apr 2010
Posts: 5
Rep Power: 15 |
Dear CFD experts:
I am developing an unstructured code and encounter a problem whereby the flow vector is pointing in/out near the wall when buoyancy model is on. I read from FLUENT manual that we can't set the normal pressure gradient at the wall = 0 when buoyant flow is simulated. Can anyone please guide me on the proper method to interpolate the wall pressure? Any references to share? I need the wall pressure in order for me to evaluate the cell pressure gradient near the wall. Please help. Thanks a lot. |
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April 28, 2010, 11:34 |
wall pressure
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#2 | |
Senior Member
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Mirroring is not a good method when you have grav forces. Interpolation is the best way to achieve the pressure at the boundaries. Given this, use a second order gradient interpolation to connect Pcell with Pb - gives you second order accuracy.
/CFDtoy Quote:
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CFDtoy |
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April 28, 2010, 21:04 |
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#3 |
New Member
KaySee
Join Date: Apr 2010
Posts: 5
Rep Power: 15 |
Dear CFD Toy:
Thanks for your prompt reply. I tried to use the gradient projection method to interpolate the wall pressure, i.e. p_wall = p_cell + grad(p_cell) * d; where d is vector pointing from the near-wall cell to the wall face. For the evaluation of grad(p_cell), I use Grauss divergence theorem. Is it the method that you have suggested in your previous reply? In fact, I still see some velocities pointing in/out near the wall. |
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