45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
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//- write force displacement to file
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label topPatchID = mesh.boundaryMesh().findPatchID("top");
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if(topPatchID == -1)
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{
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Warning << "Cannot find patch top for calculating force" << nl
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<< "Not writing to force file" << endl;
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}
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else
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{
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//- calculate force in specified direction on topClamp patch
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vector direction(0, 1, 0);
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//- for small strain or moving mesh
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// scalar topForce = gSum(
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// direction &
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// (mesh.boundary()[topPatchID].Sf() & sigma.boundaryField()[topPatchID])
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// );
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//- for large strain total lagrangian
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tensorField F = I + gradU.boundaryField()[topPatchID];
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vectorField totalForce = mesh.Sf().boundaryField()[topPatchID] & (sigma.boundaryField()[topPatchID] & F);
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vector force = sum( totalForce );
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scalar topForce = force[vector::Y];;
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//- patchIntegrate utility integrates it this way but this is worng because the sigma tensor should
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//- be dotted with the surface normal to give the actual traction/force
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//- you cannot just take the component of the sigma tensor
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//scalar topForcePatchIntegrateMethod = gSum(
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// mesh.magSf().boundaryField()[topPatchID]
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// *sigma.boundaryField()[topPatchID].component(symmTensor::XY)
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// );
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scalar disp = max(U.boundaryField()[topPatchID].component(vector::Y));
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//- write to file
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if(Pstream::master())
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{
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OFstream& forceDispFile = *filePtr;
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forceDispFile << disp << "\t" << topForce << endl;
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}
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}
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