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Wrong results for lift force every simulation

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Old   June 16, 2019, 12:37
Question Wrong results for lift force every simulation
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Henrique Carneiro
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Hello guys.

I am simulating a steady-state water flow past a bare hull underwater vehicle in ANSYS Fluent for validating purposes based on an article. The problem is that for every velocity and angle of attack the drag coefficient is correct but the lift coefficient is off by up to 50%. I have performed mesh dependency tests, tried several turbulence models, increased/decreased inflation layer size and y+, but still failing to understand the cause.

I've also turned up the gravity effect but I got no difference in the results whatsoever. Could this be because the weight is being balanced by the buoyant force? Or it is not balanced and there is no weight because the geometry is defined as hollow (I only have surfaces defining the hull body because I have used a subtract boolean feature).

Any help is appreciated. Thank you in advance!
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Old   March 19, 2021, 15:23
Default Same problem
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Jaydev Dave
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I am simulating a fuselage, and had used every combination of models possible. But still drag is expected and correct as well while lift is totally wrong.
Hey did you get any solution?
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Old   March 21, 2021, 08:58
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moh
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tray to check the reference value or use UDF such as " excute at end" to calculate lift
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