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- - **Viscous rhopSonicFoam**
(*http://www.cfd-online.com/Forums/openfoam-solving/60331-viscous-rhopsonicfoam.html*)

Hi everybody,
I have tried tHi everybody,
I have tried to manage a viscous version of rhopSonicFoam to solve high-Mach number flows. Since the equations are written in conservative form, the viscous terms have to be formulated in an explicit manner (as far as I know): fvVectorMatrix rhoUEqn ( fvm::ddt(rhoU) +fv::gaussConvectionScheme<vector>(mesh, phiv, rhoUScheme).fvmDiv(phiv, rhoU) ); solve(rhoUEqn == - fvc::grad(p) + fvc::div(mu*dev2(fvc::grad(U)().T())) + fvc::laplacian(mu, U) ); fvScalarMatrix rhoEEqn ( fvm::ddt(rhoE) + mvConvection.fvmDiv(phiv, rhoE) ); solve(rhoEEqn == - mvConvection.fvcDiv(phiv, p) + fvc::laplacian(mu * Cp / Pr, T) ); Question #1: is this the only way to include them in a conservative form of N-S equations? The computation of a bluff body at Mach 15 is performed easily, and a grid-independent solution is reached. On the other hand, a flat-plate parallel to the flow (Mach 9.9) shows instabilities at the first cells as soon as the grid is refined (gradients are sharper). I have also tried to increase the nOuterCorrectors and nCorrectors but the solution diverges within the timestep! Question #2: any idea (or reference) about how to solve the problem? Question #3: have you references where I can get a description of the multivariateGaussConvectionScheme? I would like to know how it works and why it is used in this solver... Thanks Max |

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