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Cavitation problem in cavitatingFoam!!!!

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Old   April 8, 2015, 01:23
Default Cavitation problem in cavitatingFoam!!!!
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Duong Tung
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Hello all,

I am facing with some problems when I run cavitatingFoam.
Actually, my topic is prediction of the cavitation phenomena inside the injector. Therefore, I used cavitatingFoam to simulation this problem.
However, there are some different results between 2D and 3D geometry. I think that the results of 3D are absolutely fine, but the 2D case is not good (the cavitation region appears in the undesirable area).
I showed some results in some pictures below(the first picture is the result of 2D,the rest is 3D).

Could you please help me to find the reason why am I getting cavitating flow in the indicated area?

Thank you for all your help!
Duong Tung
Attached Images
File Type: jpg qeqw.jpg (20.9 KB, 67 views)
File Type: jpg qwe.jpg (22.1 KB, 50 views)
File Type: jpg qecv.jpg (21.8 KB, 48 views)

Last edited by gnut1989; April 8, 2015 at 03:22.
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Old   April 8, 2015, 07:29
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Alexander Bartel
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Hello Duong Tung,

I am currently working on the same problem, but I am not as far as you are.
But I have got one advice.
Perhaps you can try the InterPhaseChangeFoam solver too, and decide which of the solver is better.
I skipped cavitatingFoam and focused on InterPhaseChangeFoam, because the results seemed to be more feasible and the time for computation was decreased.

regards
Alex
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Old   April 9, 2015, 01:05
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Duong Tung
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Quote:
Originally Posted by alexB View Post
Hello Duong Tung,

I am currently working on the same problem, but I am not as far as you are.
But I have got one advice.
Perhaps you can try the InterPhaseChangeFoam solver too, and decide which of the solver is better.
I skipped cavitatingFoam and focused on InterPhaseChangeFoam, because the results seemed to be more feasible and the time for computation was decreased.

regards
Alex
Hello Alex,
Thank you for your quick advice!
As I know, the interPhaseChangeFoam is the solver for 2 incompressible, isothermal immiscible fluids with phase - change. However, in my topic, I need to simulate the compressible flows. Is it possible to use interPhaseChangeFoam for my case? Could you please help me to give some explaination about this solver?
Best regards,
Duong Tung
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Old   April 9, 2015, 07:14
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Alexander Bartel
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the first google result for "InterPhaseChangeFoam" is http://www.tfd.chalmers.se/~hani/kur...ChangeFoam.pdf

in this link the tutorial cavitatingBullet is described.
IPCF looks legit for cavitation... although the describtion "Solver for 2 incompressible, isothermal immiscible fluids" is a bit confusing.
I think "with phase-change (e.g. cavitation)" means that after the phase-change there is also a compressible phase.

regards
Alex
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Old   April 10, 2015, 01:07
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Duong Tung
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Quote:
Originally Posted by alexB View Post
the first google result for "InterPhaseChangeFoam" is http://www.tfd.chalmers.se/~hani/kur...ChangeFoam.pdf

in this link the tutorial cavitatingBullet is described.
IPCF looks legit for cavitation... although the describtion "Solver for 2 incompressible, isothermal immiscible fluids" is a bit confusing.
I think "with phase-change (e.g. cavitation)" means that after the phase-change there is also a compressible phase.

regards
Alex
Hi Alex,
Thank you very much for your help!
I will try to run with IPCF solver for my case. If you had already any projects which have related with cavitation problem & OpenFOAM, please share them to me to make me understand easily this problem.

Best regards,
Duong Tung
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Old   April 10, 2015, 01:43
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Duong Tung
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Quote:
Originally Posted by alexB View Post
the first google result for "InterPhaseChangeFoam" is http://www.tfd.chalmers.se/~hani/kur...ChangeFoam.pdf

in this link the tutorial cavitatingBullet is described.
IPCF looks legit for cavitation... although the describtion "Solver for 2 incompressible, isothermal immiscible fluids" is a bit confusing.
I think "with phase-change (e.g. cavitation)" means that after the phase-change there is also a compressible phase.

regards
Alex
Hi Alex,
Thank you very much for your help!
I will try to run with IPCF solver for my case. If you had already any projects which have related with cavitation problem & OpenFOAM, please share them to me to make me understand easily this problem.

Best regards,
Duong Tung
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