Second order spatial derivatives
Does anyone know of recent references for approximating second order derivatives of velocity on unstructured finite volume meshes.
I am interested in obtaining the viscous diffusion term of the Navier-Stokes solution on a post-processing basis in order to calculate the acceleration. I have already used a simple method of creating shape functions at each volume node and differentiating the derivative a second time... but I am concerned about the accuracy of this method, especially near walls.
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