Weighted Sum of Gray Gases Model (WSGGM) Absorption Emission sub-model for OpenFOAM 4.1

Implemented based on [Fluent User Guide] (http://www.afs.enea.it/project/neptunius/docs/fluent/html/th/node117.htm) and the following references:

• T. F. Smith, Z. F. Shen, and J. N. Friedman. "Evaluation of Coefficients for the Weighted Sum of Gray Gases Model". J. Heat Transfer. 104. 602608. 1982.

• R. Siegel and J. R. Howell. "Thermal Radiation Heat Transfer. Hemisphere Publishing Corporation, Washington DC. 1992.

To compile:

 cp -rf wsggmAbsorptionEmission $FOAM_SRC/src/thermophysicalModels/radiation/submodels/absorptionEmissionModel/.
 wmake

To select WSGGM model use the follwing options in radiationProperties:

  absorptionEmissionModel wsggmAbsorptionEmission;

  wsggmAbsorptionEmissionCoeffs
  {

      meanBeamPathAutoCalcMode		true;
      sector sector    [ 0  0  0  0  0  0  0] 360.0; //Degrees
      pathLength pathLength [ 0 1  0  0  0  0  0]  0.1; //m
      emissivityCoeffs 3(  0.4201 6.516 131.9 );
      fittingFactors  
          3        
          (
           4(6.508e-1 -5.551e-4 3.029e-7  -5.353e-11)
           4(-0.2504e-1  6.112e-4  -3.882e-7  6.528e-11)
           4(2.718e-1 -3.118e-4  1.221e-7  -1.612e-11)
          );

  }