Recently, I am writing codes to solve velocity potential equation which is laplace equation form to solve the incompressible and inviscid airfoil field. And after solving the system, I get the potential on each nodes. Then, I use Datapostprocessor class to calculate solution's derivatives and output to tecplot format. I find the solution is continous in tecplot, but its derivative is not. And I have learned that for Q1/Q2,etc element, its derivative is not continous between adjacent cells in theory, but in engineering we usually smooth the values between adjacent cells. My question is: -* Is there any easy way to smooth the values between adjacent cells*？(I believe dealii has considered this problem, but I just didn't find any examples from tutorial.) Best [image: smooth.png] [image: cp_zoom_q1_element.png]
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