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May 5, 2013, 17:28 |
Back flow in axial comperssor
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#1 |
New Member
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DEAR SIRS
I NEED TO KNOW THE BEST BOUNDARY CONDITIONS USED IN MODELING OF AXIAL FLOW COMPRESSOR IN ANSYS CFX . IF I USED INLET PRESSURE 1 Pa AND MASS FLOW RATE AT OUTLET =20KG/S THE SOLUTION NOT CONVERGE ???I DO NOT KNOW WHY ?? THE PRESSURE RATIO =2.105 |
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May 5, 2013, 18:52 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria
And also read the best practises guide for turbomachinery in the CFX documentation. |
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May 26, 2013, 08:36 |
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#3 | |
New Member
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Quote:
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May 26, 2013, 09:00 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Usually a mass flow inlet with a pressure outlet is best.
But this is all discussed in the documentation. You really should read it so you know the answers to these questions yourself. |
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May 27, 2013, 06:42 |
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#5 | |
Senior Member
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Quote:
You can also give the following boundary conditions: Inlet: massflowrate @ 20 kg/s Outlet: Static Pressure Try to put Y+ value correctly as found by the formula. Apply SST turbulence model, if you are not having much experience in CFD. I hope this will improve your convergence. |
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