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How to add BrownianMotionForce in cloudProperties in OpenFOAM 10

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Old   December 19, 2023, 11:32
Default How to add BrownianMotionForce in cloudProperties in OpenFOAM 10
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W Zhang
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Hello Everyone. I would like to simulate the capture of the very small number of Lagrangian droplets mixed in the gas on the cylinder using Eulerian solver pimpleFoam for the gas. It is one-way coupled. I want to add Brownian motion force in the cloudProperties. But there are some errors. Could anyone else give me some help. Thanks in advance.cloudProperties.txt
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Old   December 20, 2023, 06:21
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Hi

I think you can't do particle tracking with just pimpleFOAM. You must be using some solver based on the pimple algorithm for the fluid phase. I have used DPMFoam long ago for my simulations to track particles in turbulent flow. I assume the cloudproperties file is similar to kinematicCloudProperties in DPMFosm. In the new version, they might call DPMFoam something else. May I ask which solver are you using?

From the couldProiperties file you shared, i see that you can include dispersion model, which gives particle some stochastic motion. So if you mean turbulent dispersion by Brownian motion force, then you can simply use dispersion models. There are mainly two options (in DPMFoam):

StochasticDispersionRAS
GradientDispersionRAS

PS: if you are interested in particle tracking in OpenFOAM then you might wanna read this publication. Things will be much clear to you
https://www.mdpi.com/2311-5521/7/10/337

Good luck
Atul
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Old   December 20, 2023, 06:54
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Hi

Thanks so much for your reply. I am using the pimpleFoam for the continuous phase gas, and the lagrangian tracer for the droplets, it is a one-way coupled and laminar flow.
I can add drag, gravity, pressureGradient in the cloudProperties. But the drag, gravity, pressureGradient are in path: a: OpenFOAM-10\src\lagrangian\parcel\submodels\Momentum\Partic leForces,BrownianMotionForce is in path:b:OpenFOAM-10\src\lagrangian\parcelTurbulence\submodels\Therm odynamic\ParticleForces.

Best regards,
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