What farfield settings for komegaSST with o-mesh?
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Hello,
I've changed the mesh and AOA setting approach of a case and can't reproduce the results. Changes: 1: The mesh was changed from a rectangular mesh created with snappyHexMesh and a tool which helped to get the y+ = 1 right to an o-mesh with y+ = 1. - the rectangular mesh had the following boundary patches: inlet, outlet, top, bottom, front, back, airfoil - the o-mesh has front, back, airfoil, farfield 2: The AOA (6.24°) was initially set in the mesh, it's now set by setting the x,z components of the velocity in the U (14.6 m/s) file. The mesh was/is in the x,z plane. The directions in the forceCoeffs file to calculate x,z were adjusted accordingly. Results: Expected: cl = 1.14 cd = 0.0225 Current result: cl = 1.6 cd = -0.025 (negative!) Strange U/p results visible in paraFoam (see attachment farfield_error) U file: FoamFile { version 2.0; format ascii; class volVectorField; location "0"; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (14.513 0 1.587); // angle of attack = 6,24° vx=v*cos(6,24°), vy=v*sin(6,24°) boundaryField { front { type empty; } back { type empty; } airfoil { type fixedValue; value uniform (0 0 0); } farfield { type freestream; freestreamValue uniform (14.513 0 1.587); } } forceCoeffs file: forces { type forces; functionObjectLibs ("libforces.so"); outputControl timeStep; outputInterval 1; patches ("airfoil"); pName p; UName U; rhoName rhoInf; log true; CofR (0.25 0 0); rhoInf 1.225; } forceCoeffs { type forceCoeffs; functionObjectLibs ("libforces.so"); outputControl timeStep; outputInterval 1; patches ("airfoil"); pName p; UName U; rhoName rhoInf; log true; liftDir (-0.108653 0 0.994075); dragDir (0.994075 0 0.108653); CofR (0.25 0 0); pitchAxis (0 1 0); magUInf 14.6; rhoInf 1.225; lRef 1; Aref 0.1; } boundary file: 4 ( front //auto1 { type empty; nFaces 40800; startFace 81300; } back //auto2 { type empty; nFaces 40800; startFace 122100; } airfoil //auto3 { type wall; nFaces 300; startFace 162900; } farfield //auto4 { type patch; nFaces 300; startFace 163200; } ) What's wrong with the farfield settings? What's wrong with the AOA settings? Klaus |
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