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Tangential derivatives in cylindrical coordinates

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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?

0 Replies Last Post 2018年1月11日 GMT-0500下午3:35
COMSOL Moderator

Hello Vaidehi Oruganti

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