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airplane with MA 0.05

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Old   April 11, 2017, 21:42
Default airplane with MA 0.05
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Jenna Yu
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dear all, I have a problem in simulation of airplane with low velocity, the Ma number is only 0.05. I used pressure based, kwsst, velocity inlet, pressure outlet boundaries, incompressible ideal gas, and it diverge. When I use incompressible ideal gas, pressure based, pressure far field boundaries, it point out I should use ideal gas. When the Ma number is 0.3, it goes well. So, could anyone help me solve this? Which model and boundary conditions should I use?

Thank you very much.
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Old   April 17, 2017, 09:00
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Jenna Yu
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I used velocity inlet and pressure outlet boundaries, and SA model, however, the drag is very low when attack angle is zero, this leads to the high lift/drag which is quite different from usual numerical results. Anyone could help me with this problem? Thanks a lot.
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airplane, divergence, fluent, incompressible, ma 0.5

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