STYLE: Updated solver header comments

applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/buoyantBoussinesqPimpleFoam.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -40,7 +40,7 @@ Description
 
     Valid when:
     \f[
-        rho_{k} << 1
+        \frac{beta(T - T_{ref})}{rho_{ref}} << 1
     \f]
 
 \*---------------------------------------------------------------------------*/

applications/solvers/heatTransfer/buoyantBoussinesqSimpleFoam/buoyantBoussinesqSimpleFoam.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -29,18 +29,18 @@ Description
 
     Uses the Boussinesq approximation:
     \f[
-        rho_{eff} = 1 - beta(T - T_{ref})
+        rho_{k} = 1 - beta(T - T_{ref})
     \f]
 
     where:
-        \f$ rho_{eff} \f$ = the effective (driving) density
+        \f$ rho_{k} \f$ = the effective (driving) density
         beta = thermal expansion coefficient [1/K]
         T = temperature [K]
         \f$ T_{ref} \f$ = reference temperature [K]
 
     Valid when:
     \f[
-        rho_{eff} << 1
+        \frac{beta(T - T_{ref})}{rho_{ref}} << 1
     \f]
 
 \*---------------------------------------------------------------------------*/