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How to evaluate the force of particles to the fluid in Lagrangian method

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Old   November 8, 2018, 05:09
Default How to evaluate the force of particles to the fluid in Lagrangian method
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Maria
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Dear all,

I'm using a Eulerian-Lagrangian solver to simulate gas-solid flow. And in the UEqn.H file of the solver, there is a term of parcels.SU(U). I know that this term is used to expand the momentum equation for two-way coupling. But how to evaluate this term?

Thanks in advance.

Maria
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Old   November 8, 2018, 11:41
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Hi, maria, regarding your thread, seems what I do is similar to your issue.
How is your case going now?
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Old   November 8, 2018, 12:04
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Hi, I just read the source code of kinematicCloudI.H which has the implementation of SU(volVectorField& U).
In the implementation of SU(), a switch named coupled determines the two-way coupling works indeed.
What does Vdt() mean in this function?
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Old   November 8, 2018, 22:48
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Quote:
Originally Posted by NewKid View Post
Hi, I just read the source code of kinematicCloudI.H which has the implementation of SU(volVectorField& U).
In the implementation of SU(), a switch named coupled determines the two-way coupling works indeed.
What does Vdt() mean in this function?
I also have the same findings, the equation for SU is shown in the attached figure. But I don't know the meaning of each term, do you have any clue?

About Vdt, I think it is related to the time step, but don't know the specific meaning either...
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Old   November 9, 2018, 01:50
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Hi, maria, nice to see your response.
I have no clue to the terms in the implementation of SU() in kinematicCloudI.H, in fact I don't know how the coupling works.
But I have a model to describe the interactions between the gas and the liquid, what I need to do is to write a new function/routine in kinematicCloudI.H to implement my model, and replace the parcels.SU(U) with my new function.
I do hope it's a successful attempt.
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Old   November 13, 2018, 22:46
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Hi, Maria, do you understand dimensionedField and 'dimForce' in KinematicCloudI.H?
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Old   November 13, 2018, 23:28
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fvOptions seems another option to hold the source?
https://openfoam.org/release/2-2-0/fv-options/
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