Problem with definition of normal gradient to a surface

batta31 · October 23, 2012, 03:53

Hi guys!

I'm experiencing some troubles with the definition of the normal gradient of the velocity to a patch. What I need to obtain is the normal gradient to the patch of the normal component of the velocity and the tangential component of the velocity separately.

So I've tried so implement this piece of code:

word patchName1 = "foil";
label patchID1 = mesh.boundary().findPatchID(patchName1);
vectorField UN((mesh.boundary()[patchID1].nf() & U.boundaryField()[patchID1]) * mesh.boundary()[patchID1].nf());
vectorField UT(U.boundaryField()[patchID1] - UN);
vectorField gradUT(fvc::snGrad(UT));

But it doesn't work. Do you have any ideas? I really don't know what to do.

Cheers
Simone

batta31 · October 26, 2012, 08:48

There isn't anyone who can give me a suggestion?

October 23, 2012, 03:53	Problem with definition of normal gradient to a surface	#1
batta31 Member Simone Join Date: Sep 2012 Posts: 95 Rep Power: 13	Hi guys! I'm experiencing some troubles with the definition of the normal gradient of the velocity to a patch. What I need to obtain is the normal gradient to the patch of the normal component of the velocity and the tangential component of the velocity separately. So I've tried so implement this piece of code: word patchName1 = "foil"; label patchID1 = mesh.boundary().findPatchID(patchName1); vectorField UN((mesh.boundary()[patchID1].nf() & U.boundaryField()[patchID1]) * mesh.boundary()[patchID1].nf()); vectorField UT(U.boundaryField()[patchID1] - UN); vectorField gradUT(fvc::snGrad(UT)); But it doesn't work. Do you have any ideas? I really don't know what to do. Cheers Simone Last edited by batta31; October 24, 2012 at 09:36.

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October 26, 2012, 08:48		#2
batta31 Member Simone Join Date: Sep 2012 Posts: 95 Rep Power: 13	There isn't anyone who can give me a suggestion?