Interpolate from internalField to patch -- CFD Online Discussion Forums

September 29, 2017, 11:59	Interpolate from internalField to patch	#1
mtgoncalves New Member Join Date: Aug 2016 Posts: 19 Rep Power: 9	I can obtain the normal vector of a quantity at each face center using surfaceScalarField dpdn = linearInterpolate(-(fvc::ddt(U) + fvc::div(phi, U) - fvc::laplacian(nu, U))) & (mesh.Sf()/mag(mesh.Sf())); But how do I restrict this computation to a single patch only? I tried to do this but it does not work: surfaceScalarField dpdn = linearInterpolate(-(fvc::ddt(U) + fvc::div(phi, U) - fvc::laplacian(nu, U))) & mesh.boundaryMesh()[boundary_label("numericalBoundary")].faceNormals() What am I doing wrong?

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