# Boundary Condition for rotating mesh w/ polynomial inlet profile

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 January 13, 2023, 14:17 Boundary Condition for rotating mesh w/ polynomial inlet profile #1 New Member   Patrick Join Date: Jan 2023 Posts: 2 Rep Power: 0 OF7 (no groovyBC) What I have: 1.png - Curved mesh that rotates around a fixed point outside of the mesh (via dynamicMesh) - Inlet boundary condition is a polynomial profile, which means that the inlet flow varies across one axis (in the picture the red vertices depict the highest velocities). I have integrated the profile like this: inlet { type fixedProfile; profile polynomial ( ((-1.9 0 -1.0) (1 0 1)) ); direction (1 0 0); origin 0; } The numbers in the double brackets determine the angle and the velocity of the inlet flow. The Problem: 2.png I have a transient simulation and the angle of the flow stays the same while the angle of the inlet changes during the rotation of the mesh. What I would like to have: I would like for the inlet flow to always be perpendicular to the inlet surface during rotation. I couldn`t find a suitable boundary condition that covers a mesh/inlet rotation plus a polynomial profile. I guess a fixedProfile type is the only one that allows polynomial profiles to be created?! Thanks in advance.

 January 24, 2023, 06:31 #2 New Member   Patrick Join Date: Jan 2023 Posts: 2 Rep Power: 0 I tried going down the "codedFixedValue" route. I use the following code: code #{ const fvPatch& boundaryPatch = patch(); const vectorField& Cf = boundaryPatch.Cf(); const vectorField& n = boundaryPatch.nf(); vectorField& field = *this; const scalar vmin = 25.597; const scalar vmax = 35; const scalar dmin = 24.5; const scalar h = 9; forAll(Cf, faceI) { const scalar x = Cf[faceI].x(); const scalar z = Cf[faceI].z()-33.5; const scalar distance = pow(x*x+z*z,0.5); const scalar faceVel = vmin + (distance - dmin) * (vmax - vmin)/h; field[faceI] = faceVel*n; } #} Apart from the last line of code everything seems to work, at least run through. But the last line (57) messes up the whole thing. The displayed errors are: processor0/0/U/boundaryField/inlet:57:17: no match for »operator=« (operand types are »Foam::Vector« and »Foam::tmp > >«) - processor0/0/U/boundaryField/inlet:57:17: candidates are: In file included from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/vector.H:39:0, from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/point.H:35, from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/pointField.H:35, from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/edge.H:40, from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/edgeList.H:32, from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/PrimitivePatch.H:56, from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/primitivePatch.H:35, from /opt/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude/polyPatch.H:43, from /opt/OpenFOAM/OpenFOAM-8/src/finiteVolume/lnInclude/fvPatch.H:39, from /opt/OpenFOAM/OpenFOAM-8/src/finiteVolume/lnInclude/fvPatchField.H:47, from /opt/OpenFOAM/OpenFOAM-8/src/finiteVolume/lnInclude/fixedValueFvPatchField.H:54, from /opt/OpenFOAM/OpenFOAM-8/src/finiteVolume/lnInclude/fixedValueFvPatchFields.H:29, from fixedValueFvPatchFieldTemplate.H:37, from fixedValueFvPatchFieldTemplate.C:25: I guess OpenFOAM wants me to use a vector or anything. But by choosing a vector I determine a direction which I don't want since I rotate the whole mesh (including the inlet). Maybe someone can make something of this. I'm thankful for the tiniest of responses.

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