Implement Navier-Stokes regularizations for Euler eq
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Continuation of !71 (closed)
Implements the Navier-Stokes from J.-L. Guermond and B. Popov, “Viscous regularization of the euler equations and entropy principles,” SIAM Journal on Applied Mathematics, vol. 74, no. 2, pp. 284–305, 2014.
PR also contains some other fixes:
IntegrationTests; in particular, we now report the Inf norm of differences together with the grid point where the comparison failedSmoothedArtificialViscosity
examples for sod shock tube problem and isentropic flow