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Sanity check: different nMoles in thermophysicalProperties similar results for 2 runs

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Old   May 5, 2014, 17:50
Default Sanity check: different nMoles in thermophysicalProperties similar results for 2 runs
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Andrew Somorjai
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So I have this for my thermophsicalProperties for steam and I'm running it with the buoyantPimpleFoam hotRoom (slightly altered) case with nMoles 10 and another run with nMoles 100 and I get the same results?

Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      thermophysicalProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

thermoType      hRhoThermo<pureMixture<constTransport<specieThermo<hConstThermo<perfectGas>>>>>;

pRef            101325;

mixture
{
    specie
    {
        nMoles          10;
        molWeight       18.02;
    }
    thermodynamics
    {
        Cp              2.26;
        Hf              333700;
    }
    transport
    {
        mu              .000000001;
        Pr              .000000001;
    }
}


// ************************************************************************* //
Shouldn't the nMoles 100 case have a lower pressure and temperature at the same endTime? I figure having more of something would take more heat to heat up no?

I did change my 0/T file to this

Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0";
    object      T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 0 0 1 0 0 0];

internalField   uniform 273;

boundaryField
{    
    wall
    {
        type            zeroGradient;
    }   
    bottom
    {                
        type            compressible::turbulentHeatFluxTemperature;
        heatSource      power;// or flux
        q               uniform 20000;
        alphaEff        kappaEff;
        K               basicThermo;
        Cp              uniform 897;// steam
        value           uniform 673.5;
        KName             K;
    }
}
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Old   May 6, 2014, 17:51
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Andrew Somorjai
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Nevermind, I think I figured it out. I had too many moles to begin with. After changing one of the systems (with less moles) to nMoles .01 there was definitely a big difference.
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