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total pressure boundary problem ==> flow from outlet to inlet!! |
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November 20, 2010, 12:41 |
total pressure boundary problem ==> flow from outlet to inlet!!
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Mohammad.R.Shetab
Join Date: Jul 2010
Posts: 49
Rep Power: 16 |
Dear Foamers
I'm modeling a centrifugal fan. It has an almost large radius half-sphere at inlet because of modeling air in the room. And also has an almost long duct at outlet. I've used these boundary conditions for inlet and outlet: Inlet P : total pressure 0 U : pressureInletVelocity; k : fixed value 1e-6; epsilon : fixed value 1e-9; outlet P : fixedvalue 0 (or fixedMeanValue 0) U : zeroGradient k : zeroGradient epsilon : zeroGradient but in my first iterations (more than 500 iterations) flow is from outlet to inlet and after that the flow will turn around and will be correct. I don't know the reason. Anyone know why this happens?!! |
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