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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › Finding Lift force in CG motion UDF › Reply To: Finding Lift force in CG motion UDF

April 16, 2024 at 10:59 am
Rob
Forum Moderator

The CG_MOTION examples should cover the data use - basically the force will be calculated and then the motion assigned. 

Regarding vel[1] values. At present it's uncertain if they're high because the maths you're using isn't quite right or if it's because the solver is diverging and that then returns a nonsense value to the equation which in turn causes the airfoil to move too far.