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Incorrect lift force in simpleFoam airfoil simulation |
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May 14, 2019, 17:11 |
Incorrect lift force in simpleFoam airfoil simulation
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#1 |
New Member
Olov Danielson
Join Date: May 2019
Posts: 2
Rep Power: 0 |
Hi!
I'm trying to simulate a symmetric NACA-0015 airfoil in 3d using simpleFoam in order to derive forces acting on it. At 18 degree angle towards wind the results look about right (+25% for drag force and -25% for lift force) compared to tabular values. But at 0 degree angle I get roughly equal lift and drag force (lift is Y and drag Z) while I expected to have no lift force at all. """ SIMPLE solution converged in 6.95 iterations forces forces_on_object write: sum of forces: pressure : (-0.00244928 -10.9063 -9.32257) viscous : (1.46895e-05 -0.00138044 -3.18357) porous : (0 0 0) """ Pressure and velocity seem to be equal above and below the profile (see attached images). Any pointer to what I might have missed is much appreciated! Thanks, Olov |
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May 18, 2019, 06:47 |
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#2 |
Member
Join Date: Nov 2014
Posts: 92
Rep Power: 12 |
Hi Olov, your mesh is not good enough. First, mesh needs to much finer. Second, boundary layer mesh is needed. Finally, you better use hex-dominate mesh. Also what turbulence model are you using?
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May 18, 2019, 07:51 |
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#3 |
New Member
Olov Danielson
Join Date: May 2019
Posts: 2
Rep Power: 0 |
Hi Hokhay!
Thanks for your reply, I'm using kEpsilon RAS and I use snappyHexmesh to generate the mesh. I'll try your suggestions and get back with the results. """ simulationType RAS; RAS { RASModel kEpsilon; turbulence on; printCoeffs on; } """ |
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Tags |
airfoil 3d, force, incorrect, lift and drag calculation, simplefoam |
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