Residuals decreasing in the beginning and then increasing --MRFSimpleFoam -- CFD Online Discussion Forums

February 10, 2014, 10:22	Residuals decreasing in the beginning and then increasing --MRFSimpleFoam	#1
kingmaker New Member Aditya Join Date: May 2013 Location: Munich Germany Posts: 29 Rep Power: 13	Hello My experience with Foam is limited. I am trying to simulate a case with MRFSimpleFoam. My mesh has about 2.5Million Cells and checkMesh shows 12 faces with skewness of ~5.5 as an error. I am using K-w SST turbulence model. Inlet velocity is approximately 15m/s ... I am giving K = 2.75e-2 and w = 180 as calculated from the formulae given in foam wiki. my problem is ... The residual values decrease very smoothly in the beginning. But then at about 350 Iterations they start diverging and go up up and up ... !! The simulation does not crash ... but the residuals stay at 0.1 or so ... !! I am unable to explain my self why this is happening. Any help is very much welcome. I am attaching a snapshot of the residuals and my case files. residualsDiverge.jpg fvSchemes.txt fvSolution.txt

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