# how to develope a solver

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 May 5, 2013, 04:01 how to develope a solver #1 Member   Arjang Behnoud Join Date: Oct 2012 Posts: 61 Rep Power: 6 Sponsored Links Hi everyone, i want to develop a solver by adding energy equation to momentum equation(like adding temperature to icoFoam solver) but the difference is that the variables are coupled in these two equations for instance, viscosity in momentum equation varies with temperature in energy equation. what should i do? any help is appreciated. Arjang
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 May 5, 2013, 05:13 new volScalarField nu #2 Senior Member   Fabian Roesler Join Date: Mar 2009 Location: Germany Posts: 210 Rep Power: 11 Hi stick to this howTo: HTML Code: `http://openfoamwiki.net/index.php/How_to_add_temperature_to_icoFoam` 1. You can add a new scalarField nu for the kinematic viscosity to the createFields.H like this: Code: ```volScalarField nu ( IOobject ( "nu", runTime.timeName(), mesh, IOobject::NO_READ, IOobject::AUTO_WRITE ), nu0*(scalar(1)-nuk*(T-T0) ); ``` 2. Read the constants of your viscosity function. For example nu0, nuk and T0 for a linear function Code: `nu = nu0*(scalar(1)-nuk*(T-T0));` Code: ```dimensionedScalar nu0 ( transportProperties.lookup("nu0") ); dimensionedScalar nuk ( transportProperties.lookup("nuk") ); ... ``` 3. Update your viscosity function after you solved for temperature in the TEqn.H Code: `nu = nu0*(scalar(1)-nuk*(T-T0));` This should be all. Regards Fabian

 May 6, 2013, 02:57 appreciation #3 Member   Arjang Behnoud Join Date: Oct 2012 Posts: 61 Rep Power: 6 Hallo Fabian Vielen Dank.

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