airplane with MA 0.05

yujiajia13 · April 11, 2017, 22:42

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.

yujiajia13 · April 17, 2017, 10:00

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.

April 11, 2017, 22:42	airplane with MA 0.05	#1
yujiajia13 New Member Jenna Yu Join Date: Sep 2014 Posts: 6 Rep Power: 13	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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April 17, 2017, 10:00		#2
yujiajia13 New Member Jenna Yu Join Date: Sep 2014 Posts: 6 Rep Power: 13	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.