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what solver to model vapor supersaturation ?

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Old   April 15, 2018, 15:49
Default what solver to model vapor supersaturation ?
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Hi,

My case is a hot, vapor-saturated air stream flowing through a cooled pipe. The temperature change causes the vapor (an alcool) pressure to change.

I need to model the supersaturation, i.e. the ratio of vapor pressure to saturation vapor pressure.

I need a solver with heat and mass transfer. Are there readily available solvers in OpenFOAM, or do I have to modify one ? And which ?

Thanks,
David.
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Old   April 17, 2018, 05:27
Default OpenFoam solvers
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Hello dplamp,

a good overview while searching a suitable solver can be found here:

https://www.openfoam.com/documentati...rd-solvers.php

then search the $FOAM_TUTORIALS folder for a best matching similar case. Run it and analyze the settings and the results to see, if your particular case can be simulated by modifying the standard solver accordingly.

Add complexity step by step and check the results carefully.

If you cannot find any suitable solver, or no one of the standard solvers can be used, you have to pick that standard solver matching the fluid flow at it's best, add your particular eqquations and recompile it, but I#m also not familiar with that.

Good luck and have a nice day,

Jan
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Old   April 19, 2018, 10:42
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I picked the heatTransfer/buoyantSimpleFoam/buoyantCavity/ case :
  • My case is laminar, so, in 0/, I don't have k, epsilon, omega, alphat, nut.
  • I set the same temperature everywhere (293K).
  • I set the same velocity at inlet and outlet
BUT : I don't get a nice parabolic U profile as I used to with simpleFoam.


My geometry is a cylindrical tube ; I drew a 5 wedge, 1 cell thick. Air is flowing through.
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Old   April 19, 2018, 11:20
Default buoyantSimpleFoam boundary conditions
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With simpleFoam, I used to set the outlet U condition :
Code:
    outlet
    {
        type            zeroGradient;
    }
But with buoyantSimpleFoam, I get continuity error. So I set it just like the inlet :

Code:
    outlet
    {
        type            fixedValue;
        value           uniform (0 0 0.1169496439);        // 1/8 l/min
    }
Perhaps, it's the reason why the velocity profile is not parabolic at the outlet ?

Last edited by dplamp; April 19, 2018 at 11:21. Reason: cleanup
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