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Old   November 2, 2010, 13:58
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  #41
Edy
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Hi,

Woaw, that s a quick reply !

Well, i have two terms :
- one due to evaporation at a heated wall, which is calculated using Kurul and Podowski model, and it is absolutely independent on the phase fraction
- one due to condensation in the bulk, which is directly proportional to the void fraction.

Best,

/Edouard
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Old   November 2, 2010, 16:13
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Alberto Passalacqua
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I would start not including them in the pEqn, and treating them as they appear in the momentum equation. If you notice this destabilizes the solution, you can easily move them to the pEqn.

Best,
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Old   November 3, 2010, 06:42
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Hi,

Ok, thank you very much for your help! I'll try that.

Best,

/Edouard
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Old   November 3, 2010, 21:21
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J. Cai
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Quote:
Originally Posted by alberto View Post
The buoyantPressure BC is exactly a zeroGradient BC if p is not p_rgh. You might want to take a look at the code.

Best,
Hi, alberto, have a good day. Do you think it is possible to use the buoyantPressure BC in the twoPhaseEulerFoam solver through revising the code, like p_rgh substitute p, etc. I am wondering why OF1.7 doesn't do it like other multiphase flow solvers. Thank you in advance.

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Old   November 3, 2010, 22:06
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Alberto Passalacqua
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It has been done by Oliveira and Issa in one of their papers:

Numerical aspects of an algorithm for the Eulerian simulation of two-phase flows, Numerical aspects of an algorithm for the Eulerian simulation of two-phase flows, Vol. 43, Issue 10--11, pp. 1177 -- 1198, 2003

I tried it some time ago when I started working on the multi-fluid code, and abandoned it, since it did not lead to significant improvements for what I need.

If your problem is specifying appropriate wall boundary conditions, you can do that either using p or p_rgh.

Best,
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Old   November 3, 2010, 22:39
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Thank you for the information. I am going to read it. Chiven
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Old   December 5, 2011, 15:52
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Dear People,

I have a small doubt over the boundary and initial conditions.
I am not quite sure about why do we need to specify both Ub and p at both inlet and outlet and the walls. My understanding is , we would not quite need pressure at the walls. at all.

I hope this makes sense

Best wishes
Prashant
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Old   December 6, 2011, 11:58
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Quote:
Originally Posted by Prash View Post
Dear People,

I have a small doubt over the boundary and initial conditions.
I am not quite sure about why do we need to specify both Ub and p at both inlet and outlet and the walls. My understanding is , we would not quite need pressure at the walls. at all.

I hope this makes sense

Best wishes
Prashant
You do not specify a value of Ub and p at the same boundary. Typically if you specify Ub, you use a zeroGradient condition for p, and viceversa. At walls a condition for p is typically zeroGradient.

You need a condition on each variable, or you would not be able to define the value of the variable on the boundary itself (in some cases you could actually extrapolate, but still you need to specify you want that).

Best,
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Old   January 24, 2012, 10:29
Default Multiphase solid-gas
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hi,

I would like to simulate circulating fertilized bed in OpenFoam...I am new in it.Could somebody tell me which solvers are available for this.

thanks in advance

Recep
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