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May 13, 2020, 16:47 |
False diffusion in Lid driven cavity
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#1 |
New Member
Mudit Mehta
Join Date: Mar 2020
Posts: 15
Rep Power: 6 |
Please Help!!! Hello, Can someone please explain how a false diffusion will look like in Lid driven cavity problem. (Reynolds number = 100)
I am using first order upwind scheme for the discretization of convective terms in steady state navier stokes equation and using SIMPLE method. |
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May 13, 2020, 17:32 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,839
Rep Power: 73 |
Quote:
You are working on a test-case that has no analytical solution. we already discussed such issue. The numerical diffusion can act as if you are solving the lid-driven cavity at a smaller Re. But that is locally determined by the cfl value. For the steady case you need to consider the grid size. However, your question is not well stated. |
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May 13, 2020, 17:38 |
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#3 |
New Member
Mudit Mehta
Join Date: Jun 2019
Posts: 3
Rep Power: 7 |
The grid size i have taken is 65x65 and 21x21. I have generated u, v, p countours, streamlines, u velocity along vertical geometric centre of cavity and v velocity along horizontal centre of cavity. Can we look at false diffusion from here?
I have values to compare from ghia et. al. of u velocity along vertical line and v velocity along horizontal line. |
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May 13, 2020, 17:41 |
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#4 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,839
Rep Power: 73 |
Quote:
You can only perform a grid refinement study and report the velocity profiles at each grid. |
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May 13, 2020, 17:42 |
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#5 |
New Member
Mudit Mehta
Join Date: Jun 2019
Posts: 3
Rep Power: 7 |
Okay. Thank you so much
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Tags |
false diffusion, lid driven cavity, python script, simple algorithm |
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