CFD Online Discussion Forums - chtmultiregionsimplefoam: different pressure values in openFoam and Fluent

I have made a fluid a fluid heating case in openFoam and Fluent using same boundary conditions. All the results including velocity and heat distribution match nicely. However the highers pressure value in fluent is about 200000 Pascals and in openFoam it is as high as 9^17 Pa.

Sorry but I can not post any other results or pictures here.

But It would be a great help if someone can explain how pressure is calculated in chtmultiregionsimplefoam solver. Should I multiply or divide by some other parameter to make the range of the pressure equivalent to that of Fluent?

Here is my inlet and outlet velocity boundary conditions:

Code:

    inlet

    {

        type            zeroGradient;



    }

    outlet

    {

        type            flowRateInletVelocity;

        massFlowRate    constant -0.742;//(kg/s) Target mass flow through outlet

        value           uniform (0 0 0);

    }

I have tried following for p_rgh:

Code:

    inlet

    {

        type            fixedValue;

        value           uniform 0;//$internalField;

    }

    outlet

    {

        type            zeroGradient;

        value           uniform 0;//$internalField;

    }

And following for p:

Code:

    inlet

    {

        type            calculated;

        value           uniform 0;//$internalField;

    }

    outlet

    {

        type            calculated;

        value           uniform 0;//$internalField;

    }

Also changing uniform 0; to $internalField; does not help.