|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: 68Rep Power: 8
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 ??
|Thread||Thread Starter||Forum||Replies||Last Post|
|a problem with convergence in buoyantSimpleFoam||skuznet||OpenFOAM Running, Solving & CFD||5||February 19, 2014 05:30|
|Micro Scale Pore, icoFoam||gooya_kabir||OpenFOAM Running, Solving & CFD||2||November 2, 2013 14:58|
|pimpleFoam: turbulence->correct(); is not executed when using residualControl||hfs||OpenFOAM Running, Solving & CFD||3||October 29, 2013 09:35|
|How to write k and epsilon before the abnormal end||xiuying||OpenFOAM Running, Solving & CFD||8||August 27, 2013 15:33|
|SLTS+rhoPisoFoam: what is rDeltaT???||nileshjrane||OpenFOAM Running, Solving & CFD||4||February 25, 2013 05:13|