reverse flow
 

hi guys, I am doing flow analysis in a conical diffuser, for large angles, the iterations doesn't converge, of course reverse flow occurs in few faces, in such cases can i take the results, i am unable to decide what to do.. when iterations doesn't converge and reverse flow occurs, shall i leave the analysis of large angle normal conical diffuser ?? or anyway out to get exact solutions when iterations doesn't converge, i will be grateful to u all, can ask me again if i wasn't clear..thnx in advance.

somu

Re: reverse flow
 

If the reveresed flow is next to the area where you want to know the flowresults then you should increase your calculation area. Sometimes you can´t avoid backflow. If the convergence is still bad try to controll your results with points in the area your interested in. There you can monitor velocity for example.

Re: reverse flow
 

typical. get the under relaxation factors lower than the current ones. specially the momentum factor.

Re: reverse flow
 

hi i have done engine plume amalysis (free jet turbulence), and problem got converged, but after convergence also reversed flow is appearing i have tested the convergence for 1e-6 and also ie-8 of residuals but then also reversed flow is not going can any body give suggestion