On 4/9/19 10:01 AM, Muhammad Mashhood wrote:
> I want to apply the heat flux BC on one of the edge instead i.e. *dU(t, x, 
> y=1)/dy* at top. For this so far I could only find a method to make a heat 
> source using the already present function as follows:

I don't know how you use the class you implement, but I would try to avoid all 
confusion by naming the class RightHandSide: This is the name we generally use 
for forcing terms of the differential equation, and not for the right hand 
side of boundary conditions.

Just like for your previous question, it is not correct to "convert" the right 
hand side of a boundary condition into a right hand side of the equation. This 
is mathematically not correct and will not lead to the correct solution.

Have you looked at step-7? This program deals with Neumann boundary conditions 
and may have exactly what you are looking for.

Best
  W.

-- 
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Wolfgang Bangerth          email:                 [email protected]
                            www: http://www.math.colostate.edu/~bangerth/

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