Rayleigh Taylor instability with interFoam

ninipribi · July 20, 2019, 03:08

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

pete20r2 · July 22, 2019, 05:09

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?

joytonight · September 12, 2019, 16:43

I have the similar issue, I fixed it by
using cyclic boundary condition for U, p_rgh and alpha.water

kk415 · October 11, 2019, 03:53

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.

MMNCH · December 27, 2019, 08:26

Quote:

Originally Posted by ninipribi

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???

July 20, 2019, 03:08	Rayleigh Taylor instability with interFoam	#1
ninipribi New Member Join Date: Jul 2019 Posts: 1 Rep Power: 0	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

September 12, 2019, 16:43	Use cyclic boundary condition	#3
joytonight New Member Yuchen Zhang Join Date: Apr 2018 Posts: 3 Rep Power: 8	I have the similar issue, I fixed it by using cyclic boundary condition for U, p_rgh and alpha.water

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July 22, 2019, 05:09		#2
pete20r2 Senior Member Peter Baskovich Join Date: Jul 2014 Posts: 127 Rep Power: 12	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?

October 11, 2019, 03:53		#4
kk415 Senior Member krishna kant Join Date: Feb 2016 Location: Hyderabad, India Posts: 133 Rep Power: 10	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.