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Problems about buoyantBoussinesqSimpleFoam solver

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Old   August 11, 2009, 09:41
Default Problems about buoyantBoussinesqSimpleFoam solver
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J. Cai
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Hi, dear foamers, I am trying to use the solver of buoyantBoussinesqSimpleFoam to calculate a simple case, however I am not sure about the boundary condition setting of p.
I consult the hotRoom case, and set it as follows.

wall:
type buoyantPressure;
rho rhok;
value uniform 0;
inlet: zeroGradient;
outlet: fixedValue;

However, the calculation results are wrong. Any comments?
Thank you in advance.

Best regards,
Chiven
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Old   August 12, 2009, 23:08
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It seems OK, have a nice day, everyone.

with best regards,
Chiven
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Old   December 20, 2009, 23:15
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Quote:
Originally Posted by chiven View Post
It seems OK, have a nice day, everyone.

with best regards,
Chiven

Hi, Chiven,
Are you doing heat transfer ? It seems that buoyantBoussinesqPisoFoam can't select LES turbulence model, it noly can use RAS model.Could you give me some suggestion what is the easise way to use LES buoyant model?
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Old   December 21, 2009, 00:24
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Hi, Jiang, this time I am struggling for the multiphase flow.
What a pity I am not good at LES model. Maybe you need revise the code referencing to the solvers with LES model, like buoyantPisoFoam, etc.
best regards,
Chiven
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Old   December 21, 2009, 21:05
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Thanks ,Chiven.
I think I should modify buoyantPisoFoam.
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Old   February 9, 2010, 01:15
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Quote:
Originally Posted by chiven View Post
Hi, Jiang, this time I am struggling for the multiphase flow.
What a pity I am not good at LES model. Maybe you need revise the code referencing to the solvers with LES model, like buoyantPisoFoam, etc.
best regards,
Chiven
Dear chiven,
because my buoyantBoussinesqSimpleFoam result is completely wrong, could you tell me the best boundary conditon for p?
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Old   February 9, 2010, 02:01
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try to use fixed value for outlet and buoyantPressure for wall.

best regards,
chiven
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Old   February 10, 2010, 10:08
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Quote:
Originally Posted by chiven View Post
try to use fixed value for outlet and buoyantPressure for wall.

best regards,
chiven
Dear chiven ,

I have used fixed value for outlet and buoyantPressure for wall, but my result is unphysical. I have struggling for buoyantBoussinesqSimpleFoam for a long time, and try a lot of boundary condition, but all the result is not right. I use version-1.6. I think this solver have some problem, If I should modify this solver ?
The following is fluent and OpenFOAM result of U_X contour , the fluent result is right , but OpenFOAM can't get this contour.

in OpenFOAM, the flow structure near outlet region always have problem.
Thank you very much.
Attached Images
File Type: jpg model.jpg (81.8 KB, 88 views)
File Type: jpg fluent.jpg (52.8 KB, 113 views)
File Type: jpg OpenFOAM.jpg (41.8 KB, 106 views)
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Old   April 9, 2014, 12:04
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Dear All,

I am fighting the same bull currently. It is the same case that panda60 asked for in other topic.

What I am trying to simulate it is flap terrain with a obstacle in the middle of the domain. I impose a stable ABL with a T and U BC at inlet based on monin-obukov theory. For p and p_rgh I have imposed bouyantPressure in all patches and the ground wall.

Could all of us summarize a set or procedure to simulate this kind of simulations?

Best Regards
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Old   October 27, 2014, 16:39
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Leonardo Oliveira
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Quote:

Dear All,

I am fighting the same bull currently. It is the same case that panda60 asked for in other topic.

What I am trying to simulate it is flap terrain with a obstacle in the middle of the domain. I impose a stable ABL with a T and U BC at inlet based on monin-obukov theory. For p and p_rgh I have imposed bouyantPressure in all patches and the ground wall.

Could all of us summarize a set or procedure to simulate this kind of simulations?

Best Regards
Hello M.Monteiro,

Did you get some advancement in your simulation?
I'm trying to test the same case of yours, a flat terrain with an obstacle in the middle and a stable atmosphere.
One huge doubt that I have is: How to set up a vertical gradient from the terrain to the top? Do I have to set it up on the BCs or on the internalField?

Best regards
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