Tangential derivatives in cylindrical coordinates

Vaidehi Oruganti

The below post is related to an archived discussion


I am trying to write the surface gradient (i.e. tangential derivative) of test function in cylindrical co-ordinates.

I wrote : (test(uTr)+test(vTphi)+test(wTz)) and got the error: "undefined variable vTphi.

I know that the formulation is (test(uTr)+test(vTy)+test(wTz)) in cartesian co-ordinates. I am trying to write the analogue of the expression in cylindrical co-ordinates.

Could someone help me with this?


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