Convergence problem with Spalart-Allmaras Turbulence Model using mass flow at exit -- CFD Online Discussion Forums

September 4, 2015, 05:25	Convergence problem with Spalart-Allmaras Turbulence Model using mass flow at exit	#1
sagarparikh31 New Member sagar Join Date: May 2014 Posts: 24 Rep Power: 11	Hello All, I am simulating 2 stage fan, and I am using Spalart-Allmaras (SA) turbulance model. Initially I started with giving outlet boundary condition as average static pressure and it got converged within 350 iterations (Steady State), also results are matching the experimental values. From this result I got the value of mass flow rate at outlet boundary (where I had applied average static pressure) and then tried to simulate the same model by using mass flow rate value rather than average static pressure. But then the results are not converging even after 1500 iterations. Does anyone having any idea for this kind of problem using SA turbulence model?

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