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[Sponsors] |
September 2, 2014, 16:11 |
Residual fluctuation, cylinder internal flow
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#1 |
Senior Member
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Hello everyone,
I am doing simulation for internal laminar flow in a cylinder and I am using simple foam. I got the required results that match with analytical solution. But I have a problem in my residual curve. I get some fluctuation in residual curve (figure is attached), although my results are fine. I want to ask, does this fluctuation matters or not as I get in my case. I mean, the residual curve should be smooth or not. Thank you My fvScheme is as follows divSchemes { default none; div(phi,U) Gauss upwind; div(phi,k) Gauss upwind; div(phi,epsilon) Gauss upwind; div(phi,R) Gauss upwind; div(R) Gauss upwind; div(phi,nuTilda) Gauss upwind; div((nuEff*dev(T(grad(U))))) Gauss linear; } |
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September 3, 2014, 07:05 |
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#2 |
Senior Member
joegi
Join Date: Nov 2009
Location: genoa
Posts: 103
Rep Power: 16 |
Residuals are not your solution. Your solution is the quantity of interest.
Did you get a good agreement with the analytical solution using this numerical scheme? Because you are using a first order scheme, and they are highly diffusive. From your residuals I can see that maybe you were changing some parameter in the numerical scheme, and that is reflected in the jumps in the residuals. jg |
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September 3, 2014, 07:18 |
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#3 |
Senior Member
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hello Joegi
Yes I am getting good agreement with analytical solution and I didn't change any parameter while solution was running. But I was getting these peaks in residual. What other fcScheme I can try ?? Thank you |
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