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Less dispersion from very small sized gas inlet using rhoReactingBuoyantFoam

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Old   December 27, 2018, 01:25
Question Less dispersion from very small sized gas inlet using rhoReactingBuoyantFoam
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Meher
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Dear All,

I am trying to simulate dispersion of a gas(C2H4) from a very small square shaped inlet (0.0018m X 0.0018m) using rhoReactingBuoyantFoam solver.

Strangely, dispersion of C2H4 stops after initial few iterations.

I tried changing parameters of fvSchemes and fvSolution but nothing worked.

Later, I tried changing the mesh - from coarser to finer and later from ICEMCFD mesh to snappyHexMesh as well but even that did not work.

If I use a larger sized gas inlet, I do not see such behaviour. Dispersion takes place smoothly.

I know it cannot be like this but can't help to ask this question. Is there any limitation w.r.t the size of inlet to be taken in rhoReactingBuoyantFoam solver ?

Any help would be highly appreciated.

Thank you.

Meher.
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Old   January 7, 2022, 05:16
Default Variables related to turbulence models
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Akshay
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Quote:
Originally Posted by ssmeherk View Post
Dear All,

I am trying to simulate dispersion of a gas(C2H4) from a very small square shaped inlet (0.0018m X 0.0018m) using rhoReactingBuoyantFoam solver.

Strangely, dispersion of C2H4 stops after initial few iterations.

I tried changing parameters of fvSchemes and fvSolution but nothing worked.

Later, I tried changing the mesh - from coarser to finer and later from ICEMCFD mesh to snappyHexMesh as well but even that did not work.

If I use a larger sized gas inlet, I do not see such behaviour. Dispersion takes place smoothly.

I know it cannot be like this but can't help to ask this question. Is there any limitation w.r.t the size of inlet to be taken in rhoReactingBuoyantFoam solver ?

Any help would be highly appreciated.

Thank you.

Meher.
I am guessing you are using same k and epsilon/omega values for your turbulence models. These values must be taken care of when you are changing the diameter of the inlet.
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