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May 28, 2013, 06:01 |
Fluent inviscid solution
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#1 |
New Member
Ashish Kumar
Join Date: May 2013
Posts: 4
Rep Power: 13 |
I am simulating a 2D cylinder under inviscid condition, but I am getting positive values of both lift and drag coefficient, while ideally both should be zero. I even did naca 0012 under inviscid condition but in this, lift coefficient is ok, but drag is still positive and is not reduced to zero. I want to know which model to be used and i what condition to to simulate ideal condition so that pressure drag becomes zero in my simulation?
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May 28, 2013, 13:21 |
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#2 |
Senior Member
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An ideal flow would give the results you expect. However, a numerically simulated inviscid flow carries all the numerical viscosity of the numerical method and it is impossible to avoid some numerical drag. For the cylinder case i expect no lift however, and it is possible that the flow field was not symmetric when you computed the lift.
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June 21, 2014, 13:43 |
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#3 |
Member
yehanyu
Join Date: Mar 2012
Location: Beijing, China
Posts: 48
Rep Power: 14 |
For the cylinder case, since there exists numerical viscosity, it is possible that the unsteady Karman vortex street occurs. If it happens, then the lift will not be zero.
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Tags |
drag coefficient, lift coefficient, naca 0012 |
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