twoPhaseMixture: Allow construction without providing name and dimensions for rho and nu

src/transportModels/incompressible/incompressibleTwoPhaseMixture/twoPhaseMixture.C

@@ -83,8 +83,8 @@ Foam::twoPhaseMixture::twoPhaseMixture
         )
     ),
 
-    rho1_(nuModel1_->viscosityProperties().lookup("rho")),
-    rho2_(nuModel2_->viscosityProperties().lookup("rho")),
+    rho1_("rho", dimDensity, nuModel1_->viscosityProperties().lookup("rho")),
+    rho2_("rho", dimDensity, nuModel2_->viscosityProperties().lookup("rho")),
 
     U_(U),
     phi_(phi),

src/transportModels/incompressible/viscosityModels/Newtonian/Newtonian.C

@@ -50,7 +50,7 @@ Foam::viscosityModels::Newtonian::Newtonian
 )
 :
     viscosityModel(name, viscosityProperties, U, phi),
-    nu0_(viscosityProperties_.lookup("nu")),
+    nu0_("nu", dimensionSet(0, 2, -1, 0, 0), viscosityProperties_.lookup("nu")),
     nu_
     (
         IOobject