basic.H

XiModel.H
SCOPELaminarFlameSpeed.H
basicXiSubXiEq.H
basicXiSubG.H
Doxyfile (include PATH to OpenCFD Macros)
doxyFilt (include class documentation in /src)

applications/solvers/combustion/PDRFoam/PDRModels/dragModels/basic/basic.H

@@ -29,6 +29,45 @@ Description
     Basic sub-grid obstacle drag model.
     Details supplied by J Puttock 2/7/06.
 
+	Sub-grid drag term
+
+    The resistance term (force per unit of volume) is given by:
+
+	\f[
+     R = -\frac{1}{2} \rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.D
+    \f]
+
+    where:
+
+		 \f$ D \f$ is the tensor field "CR" in \f$ m^{-1} \f$
+
+	This is term is treated implicitly in UEqn.H
+
+	Sub-grid turbulence generation
+
+	The turbulence source term \f$ G_{R} \f$ occurring in the
+	\f$ \kappa-\epsilon \f$ equations for the generation of turbulence due to interaction with unresolved obstacles :
+
+	\f$	G_{R} = C_{s}\beta_{\nu} \mu_{eff} A_{w}^{2}(\dwea{\vec{U}}-\dwea{\vec{U}_{s}})^2 + \frac{1}{2}
+	\rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.T.\dwea{\vec{U}}  \f$
+
+	where:
+
+		  \f$ C_{s} \f$ = 1
+
+          \f$ \beta_{\nu} \f$ is the volume porosity (file "betav").
+
+          \f$ \mu_{eff} \f$ is the effective viscosity.
+
+          \f$ A_{w}^{2}\f$ is the obstacle surface area per unit of volume (file "Aw").
+
+		  \f$ \dwea{\vec{U}_{s}} \f$ is the slip velocity and is considered \f$ \frac{1}{2}. \dwea{\vec{U}} \f$.
+
+		  \f$ T \f$ is a tensor in the file CT.
+
+	The term \f$ G_{R} \f$ is treated explicitly in the \f$ \kappa-\epsilon \f$ Eqs in the	PDRkEpsilon.C file.
+
+
 SourceFiles
     basic.C
 
@@ -40,7 +79,6 @@ SourceFiles
 #include "PDRDragModel.H"
 #include "XiEqModel.H"
 
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 namespace Foam
 {