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How to find normal derivative of c

–2 votes

I am using CBC.PDEsys to compute u, p, c
u-velocity
p-pressure
c-temperature
n- is the cylinder surface normal direction
1) How to compute the derivative dc/dn (partial derivative) and
2) I want to integrate over the cylinder surface. is there a way to plot int(dC/dn )ds over the surface?

Because I want to compute Nusselt number on Circular cylinder surface.

closed with the note: no thanks
asked Dec 18, 2014 by palraj j FEniCS Novice (190 points)
reshown Jan 10, 2015 by palraj j
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