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September 20, 2017, 11:02
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Problem on LES of incompressible free jet
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#1 |
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New Member
Bo Kong
Join Date: Oct 2016
Location: China
Posts: 22
Rep Power: 9  |
I am doing a LES of incompressible free jet with the Re=70000. The computation domain extents 15D in streamwise and 10D in radial direction. Max co is adjusted to less 0.6.
When the flow developed to the outlet, backflow appeared, k exploded then case crashed. boundary conditions at the outlet I set as below: U:zeroGradient; p:fixedValue; k:inletOutlet; nuSgs:zeroGradient I have simulated a similar jet with lower Re(30000), and not encountered this problem. So I am confused with this and have no idea on this issue. Could anyone give me some advise how to solve this problem? Thanks! |
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September 25, 2017, 20:58
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#2 |
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New Member
Bo Kong
Join Date: Oct 2016
Location: China
Posts: 22
Rep Power: 9 |
Report:
Using fixedMeanValue for p at outlet,flow can leave the domain naturally. |
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September 25, 2017, 21:08
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#3 |
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Member
Robert Ong
Join Date: Aug 2010
Posts: 86
Rep Power: 15 |
Hi Huang,
What is your BC at the top domain for velocity? Regards Robert |
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September 25, 2017, 21:19
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#4 | |
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New Member
Bo Kong
Join Date: Oct 2016
Location: China
Posts: 22
Rep Power: 9 |
Quote:
zeroGradient Sent from my iPhone using CFD Online Forum mobile app |
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| Tags |
| backflow, jet, les |
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