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Lattice Boltzmann method for multiphase flow?

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Old   December 3, 2013, 05:43
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Rams Manu
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Hello,

I have been trying to simulate the motion of a water droplet on an oil surface through VOF in Fluent. But the complexities in modelling the dynamic contact angle (between oil-water-oil) reached a point beyond which I lost trust in VOF method.

I came to know that Lattice Boltzmann can be used for moving contact line on solid-liquid-gas. But, I would like to know if Lattice Boltzmann method will also be able to capture the dynamic contact angle between oil-water-air ! ie., can LBM method take care of the moving contact line(oil-water-air) problem ?

Experts in LBM please help me out. Also, are there any other means of solving the dynamic contact angle between oil-water-air ?

My original case is a water droplet moving over an oil surface (the water droplet does not touch the solid surface). The movement of water droplet is brought out by a body force in x-direction.

Thanks.
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Old   December 3, 2013, 07:26
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There exist some LBM models for this purpose.
See for example these two publications:

Yan, Zu: A lattice Boltzmann method for incompressible two-phase flows on partial wetting surface with large density ratio. Journal of Computational Physics 227 (2007) 763–775

Yoshino, Mizutani: Lattice Boltzmann simulation of liquid–gas flows through solid bodies in a square duct. Mathematics and Computers in Simulation 72 (2006) 264–269
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Old   December 3, 2013, 07:32
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Quote:
Originally Posted by flotus1 View Post
There exist some LBM models for this purpose.
See for example these two publications:

Yan, Zu: A lattice Boltzmann method for incompressible two-phase flows on partial wetting surface with large density ratio. Journal of Computational Physics 227 (2007) 763–775

Yoshino, Mizutani: Lattice Boltzmann simulation of liquid–gas flows through solid bodies in a square duct. Mathematics and Computers in Simulation 72 (2006) 264–269

Hi Alex,

These two papers relate to dynamic contact angle in liquid-gas-solid medium. But I want to figure out the dynamic contact angle in liquid-liquid-gas medium. Are these still applicable for a case like oil-water-air contact line in a water droplet moving over oil ?
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Old   December 3, 2013, 07:48
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I did not investigate if these models can be applied when 2 liquid phases are involved, but I would be surprised if there were no extensions for this kind of flow.
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Old   December 4, 2013, 14:56
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You could check out www.palabos.org
The gallery showcase some nice multiphase examples. I am not sure it it is better than Fluent, but you will at least have much more flexibility in incorporating your own physics into the model.

Also to me it seems that multiphase flows that are unsteady (i.e. most VOF simulations) could fit quite well to the explicit approach of the LBM.
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