# Selecting numerical schemes for temperature equation

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 May 21, 2006, 13:35 I'm solving a case with transi #1 Senior Member   Maka Mohu Join Date: Mar 2009 Posts: 305 Rep Power: 11 Sponsored Links I'm solving a case with transient coupled (trough buoyancy term) momentum and energy equation (temperature eq, boussinesq assumption). I need some comment on my selection of fvSchemes. I need to apply central difference for convective and viscous terms together with Crank Nicholson for time. I read: http://www.opencfd.co.uk/openfoam/do...#x20-1050004.4 but I have two questions: a) how does fluxRequired dictionary in fvSchemes affect the calculation? Should I put T there also? Note: I'm familiar with PISO except for the part of interpolation to surface. b) Should I put a limiter on T? you are welcome to give any comments on the following selections: // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default CrankNicholson 1; } gradSchemes { default none; //Gauss linear; grad(p) Gauss linear; grad(U) Gauss linear; } divSchemes { default none; div(phi,U) Gauss linear; div(phi,T) Gauss linear; // energy equation. Gauss limitedLinear 1 } laplacianSchemes { default none; laplacian(nu,U) Gauss linear corrected; laplacian(1|A(U),p) Gauss linear corrected; laplacian(alpha,T) Gauss linear corrected; // energy equation. //alpha: thermal diffussivity. } interpolationSchemes { default linear; interpolate(U) linear; } snGradSchemes { default corrected; } fluxRequired { default no; p; T; } // ************************************************** *********************** // best regards, Maka.

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