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Is it suitable to use Weller's scheme in this case?

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Old   June 17, 2011, 16:16
Default Is it suitable to use Weller's scheme in this case?
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Kai
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Hi Foamers,

In order to strictly restrict alpha in [0,0.52], I am now considering to use MULES in case of bubbly flow. I have a question here since in Weller's scheme, there is a compression term (eqn 4.13, Rusche). And it is said "The arti ficial term is only active in the thin interface region because of the multiplication term gamma(1-gamma)". It is true in case of liquid-vapor with clear interface which only exists somewhere. However in bubbly flow, the interface could be everywhere. I dont know if it is appropriate to use this scheme in my case. Thanks.

// Kai
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Old   June 21, 2011, 16:56
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Quote:
Originally Posted by kaifu View Post
Hi Foamers,

However in bubbly flow, the interface could be everywhere.

// Kai
Are you considering the bubbles interface as a dispersed interface or tracking each bubble's shape?

Regards.
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Old   June 21, 2011, 18:03
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Quote:
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Are you considering the bubbles interface as a dispersed interface or tracking each bubble's shape?
I do not track bubbles interface. As you said, the bubbles interface is treated as a dispersed interface.
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Old   June 21, 2011, 18:08
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Hi, MULES and interfaceCompression are intended for VOF problems in which surface is completely described and tracked. Maybe you can explain your case a little bit in order to see if it is possible to use these techniques in your case.

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Old   June 22, 2011, 05:43
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It is a two-phase Euler-Euler case. And I think the the way you define the compression term is different between the interface-tracking and dispersed interface (eqn 3.58 and eqn 4.13, Rusche). In my case, there are two velocity fields: Ua and Ub, instead of the single velocity field in the interface-tracking case.
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Old   June 22, 2011, 08:09
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Just run simple benchmarks to compare with analytic solutions and see what happens. I feel you will be happy with your results.

Quote:
Originally Posted by kaifu View Post
Hi Foamers,

In order to strictly restrict alpha in [0,0.52], I am now considering to use MULES in case of bubbly flow. I have a question here since in Weller's scheme, there is a compression term (eqn 4.13, Rusche). And it is said "The arti ficial term is only active in the thin interface region because of the multiplication term gamma(1-gamma)". It is true in case of liquid-vapor with clear interface which only exists somewhere. However in bubbly flow, the interface could be everywhere. I dont know if it is appropriate to use this scheme in my case. Thanks.

// Kai
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