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Old   February 26, 2016, 18:15
Default Weird reversed flow problem
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Hi guys,

I have a project about CFD analysis of a Wells turbine.. I work to get five points at five different rpm values about it. I have finished the calculations of first rpm value.. I got reversed flow sometimes but generrally i had no problem.. Then i have started the calculations for second rpm value and i have started to get reversed flow along 700-800 iterations nearly.. Weird point is that i did not change anything but frame motion rpm value.. Solver, boundry and cell zone conditions, trubulence model etc.. Nothing has been changed but rpm.. Maybe second weird thing is that solution does not diverge.. Pressure gradient on the outlet does not change even 1 pascal between two iterations.. It seems there is no divergence.. But there is a general problem that's certain..

Question 1) Does this issue affect my calculation? (Though we do not see any divergence when we look at the residuals and pressure gradient)

Q2) Why have i got regular reversed flow? (As i said i have changed only frame motion rpm value)

Thx..

Last edited by Kimican; February 27, 2016 at 07:30.
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