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Rayleigh Taylor instability with interFoam

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Old   July 20, 2019, 02:08
Question Rayleigh Taylor instability with interFoam
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Hello everyone,

I am new to two phase flow simulation. I am doing Rayleigh Taylor simulation in OpenFoam using interFoam solver. I tried noSlip and zeroGradient for the condition of U but the result is not good. I've attached the pictures of the phase field results in order using noSlip, zeroGradient condition and also the wanted result. Maybe I did something wrong in another part. Could anyone help me with this problem?
t2noslip.png

t2zerogradient.png

t2_wanted_result.png

Thank you in advance
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Old   July 22, 2019, 04:09
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Peter Baskovich
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zeroGradient appears to be correct, have you checked the rest of your sim is good?
Is the grid resolution enough, is the timestep good etc etc?
Have you checked what the settings were from your reference image?
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Old   September 12, 2019, 15:43
Default Use cyclic boundary condition
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Yuchen Zhang
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I have the similar issue, I fixed it by
using cyclic boundary condition for U, p_rgh and alpha.water
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Old   October 11, 2019, 02:53
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Hello ninipribi,


I am also trying to solve a Rayleigh-Taylor instability problem following the work of Lopez.
I am getting result similar to your first picture. I tried using zeroGradient condition for all pressure and U. I am still getting same result as the first picture.



I would be very thankful if you explain how you got the second the result.
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Old   December 27, 2019, 07:26
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Quote:
Originally Posted by ninipribi View Post
Hello everyone,

I am new to two phase flow simulation. I am doing Rayleigh Taylor simulation in OpenFoam using interFoam solver. I tried noSlip and zeroGradient for the condition of U but the result is not good. I've attached the pictures of the phase field results in order using noSlip, zeroGradient condition and also the wanted result. Maybe I did something wrong in another part. Could anyone help me with this problem?
Attachment 71202

Attachment 71203

Attachment 71204

Thank you in advance
hi my friend
how much is the value of "sigma" in transportProperties file???
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