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October 23, 2015, 07:36 |
Compressible flow boundary conditions
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#1 |
New Member
Join Date: Oct 2015
Posts: 5
Rep Power: 11 |
Hi,
I am trying to analyse the behavior of the engine exhaust gas in a structural facility, with wind conditions. For the effect I am using compressible flow, but I am having trouble in the boundary conditions in the volume of control. I was thinking about velocity inlet and pressure outlet, however that is not valid for compressible. I have tried pressure inlet and pressure outlet, and mass flow inlet and pressure outlet however nothing is working very well. Any suggestions? Thank you |
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October 24, 2015, 15:02 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,761
Rep Power: 66 |
A pressure inlet and pressure outlet pair are generally the most robust. For compressible flows you'll have to specify the inlet stagnation pressure (& stagnation temperature). If you need a particular mass-flow rate then use the target mass flow rate option on the pressure outlet. If this doesn't work, then you're probably doing something wrong.
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October 26, 2015, 08:01 |
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#3 |
New Member
Join Date: Oct 2015
Posts: 5
Rep Power: 11 |
This issue is - I do have convergence, but the problem is symmetrical and I am obtaining asymmetric results for the airflow. That only happens in 2nd order. I am using pressure standard and the results are getting better, but I don't understand the reason behind it.
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October 28, 2015, 10:09 |
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#4 |
Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 27 |
Can you post some pictures?
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Tags |
boundary conditions, compressible |
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