# calculated type of primitive boundary field

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 February 19, 2010, 01:35 calculated type of primitive boundary field #1 New Member   sunil Join Date: Jan 2010 Posts: 8 Rep Power: 7 hi . what is the syntax of calculated type of primitive boundary field.my case has three coupled equation with 3 variables. i have a relation between two variables (fields) at a particular patch , say x=constant *y. so how to give boundary condition for x and y at that patch. please help me. Last edited by suniljain; March 10, 2010 at 04:37.

 February 19, 2010, 17:19 #2 Senior Member   Ben K Join Date: Feb 2010 Location: Ottawa, Canada Posts: 140 Rep Power: 10 If I understand your question, you have 2 equations coupled via a fixedValue boundary condition. Something like this should work for your boundary condition (although I'd be interested to know if there's a better way): Code: ```label wall2 = mesh.boundaryMesh().findPatchID("boundaryWall2"); fixedValueFvPatchScalarField& bufferT = refCast(T.boundaryField()[wall2]); scalarField& valT = bufferT; forAll (valT, faceI) { valT[faceI] = c.boundaryField()[wall2][faceI]; }``` This code will set the boundary condition for T equal to c at the boundary labeled "boundaryWall2". For a gradient boundary condition, it's similar (described here: help with basic coupled system)

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