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homogeneous turbulence model for inhomogeneous multiphase flow simulations?

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Old   March 4, 2018, 20:51
Default homogeneous turbulence model for inhomogeneous multiphase flow simulations?
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Terry
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Hi friends!

Why cfx will recommend me to select homogeneous turbulence model for inhomogeneous multiphase flow simulations?

It said"It is recommended that a homogeneouos turbulence model is used for inhomogeneous multiphase simulations with more than one continuous phase"
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Old   March 5, 2018, 04:33
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Glenn Horrocks
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Where does it say that?
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Old   March 6, 2018, 00:32
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Where does it say that?
In CFX help-Modeling Guide-Multiphase Flow Modeling-Modeling Advice for Multiphase Flow

It said: For flows in which the phases tend to separate (for example, inhomogeneous free surface flows and oil-water separators), the homogeneous turbulence model is recommended.

Obviously, oil and water are not two mutually soluble liquids, why homogeneous turbulence model is recommened?

Thanks
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Old   March 6, 2018, 04:24
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Homogeneous means that CFX will apply the same turbulence model in each phase. So laminar, k-e, SST, RSM, whatsoever: in both phases the same turbulence model. For a case where oil and water are separated (inhomogeneous), it is safe to use this.

You can overrule this if you want. If you have good reasons to do so,
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Old   March 6, 2018, 23:22
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Quote:
Originally Posted by Gert-Jan View Post
Homogeneous means that CFX will apply the same turbulence model in each phase. So laminar, k-e, SST, RSM, whatsoever: in both phases the same turbulence model. For a case where oil and water are separated (inhomogeneous), it is safe to use this.

You can overrule this if you want. If you have good reasons to do so,

Oh I see now. That means each phase will obey the same turbulence model, isn't it?
Thanks for your detailed explaination!
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Old   March 6, 2018, 23:52
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It means more than sharing the same turbulence model. It means all phases will share the same turbulence field as well. So if one phase has k=10 at some location then all phases have k=10 at that location.
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Old   March 7, 2018, 01:00
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Originally Posted by ghorrocks View Post
It means more than sharing the same turbulence model. It means all phases will share the same turbulence field as well. So if one phase has k=10 at some location then all phases have k=10 at that location.
Thank you very much!
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