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Numerical diffusion between TVD and NVD schemes

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Old   November 21, 2016, 08:14
Default Numerical diffusion between TVD and NVD schemes
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Wenkun Zhao
Join Date: Mar 2015
Location: Nanjing, China
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Eric Brant is on a distinguished road
Hi all formers,

I recently calculated a compressible flow using rhoCentralFoam and I found quite difference between the results when using different interpolationSchemes in fvSchemes file.
The default interpolationSchemes for "reconstruct()" is VanLeer(V):
    default                linear;
    reconstruct(rho)    vanLeer;
    reconstruct(U)      vanLeerV;
    reconstruct(T)      vanLeer;
I found the result is sort of over dissipation, but when I use Gamma
    default                linear;
    reconstruct(rho)    Gamma    0.2;
    reconstruct(U)      GammaV  0.2;
    reconstruct(T)      Gamma    0.2;
the results are better. I don't know why they are different since they are all second order schemes. It means that VanLeer is more numerical diffusive?
Any suggestions?
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