BUG: Correcting psi member function return

src/thermophysicalModels/specie/equationOfState/incompressiblePerfectGas/incompressiblePerfectGasI.H

@@ -121,7 +121,7 @@ inline Foam::scalar Foam::incompressiblePerfectGas<Specie>::psi
     scalar T
 ) const
 {
-    return 1.0/(this->R()*T);
+    return 0.0;
 }
 
 
@@ -132,7 +132,7 @@ inline Foam::scalar Foam::incompressiblePerfectGas<Specie>::Z
     scalar
 ) const
 {
-    return 1.0;
+    return 0.0;
 }