|September 2, 2014, 16:11||
Residual fluctuation, cylinder internal flow
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
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;
|September 3, 2014, 07:05||
Join Date: Nov 2009
Posts: 70Rep Power: 9
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.
|September 3, 2014, 07:18||
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 ??
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