I tried to go through this tutorial. things went well just before solving. this is the error I got: --> FOAM FATAL ERROR: Unknown TurbulenceModel type RASModel Valid TurbulenceModel types: 3 ( LES RAS laminar ) From function static Foam::autoPtr<Foam::TurbulenceModel<Alpha, Rho, BasicTu rbulenceModel, TransportModel> > Foam::TurbulenceModel<Alpha, Rho, BasicTurbulen ceModel, TransportModel>::New(const alphaField&, const rhoField&, const volVecto rField&, const surfaceScalarField&, const surfaceScalarField&, const transportMo del&, const Foam::word&) [with Alpha = Foam::geometricOneField; Rho = Foam::geom etricOneField; BasicTurbulenceModel = Foam::incompressibleTurbulenceModel; Trans portModel = Foam::transportModel; Foam::TurbulenceModel<Alpha, Rho, BasicTurbule nceModel, TransportModel>::alphaField = Foam::geometricOneField; Foam::Turbulenc eModel<Alpha, Rho, BasicTurbulenceModel, TransportModel>::rhoField = Foam::geome tricOneField; Foam::volVectorField = Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh>; Foam::surfaceScalarField = Foam::GeometricFi eld<double, Foam::fvsPatchField, Foam::surfaceMesh>; Foam::TurbulenceModel<Alpha , Rho, BasicTurbulenceModel, TransportModel>::transportModel = Foam::transportMo del] in file /opt/CFDSupportFOAM4.0/beta/OpenFOAM-dev/src/TurbulenceModels/turbul enceModels/lnInclude/TurbulenceModel.C at line 113.