Sloshing using VOF at High Loads

rsslnt · November 29, 2012, 05:17

Dear Community,

Please offer help if you have exposure to simulating sloshing process at high pressure gradients.

I have a fuel tank with 100 psi pressure inside. I have to simulate the sloshing during the loading of 11g downward and 7g horizontal.I have provided acceleration in the operating conditions. Two questions are there:
1. Solution diverging even with small time step (0.0005)
2. Should I provide 100 psi in operating condition and initialize with 100 psi.

I think solution diverging due to adverse pressure gradient due to the high acceleration. How to overcome this problem?

Thank you,
rss

sicfred · November 29, 2012, 12:13

I don't think the pressure is the problem.
Did you check the courant number? did you use the variable time step? maybe you should decrease, even more the time step.
Any way, 11g and 7g are VERY high loads, are they constant or time-depend?
I'm curius, under what conditions do you have these loads?

November 29, 2012, 05:17	Sloshing using VOF at High Loads	#1
rsslnt New Member Odakkattuvalasu Join Date: Jan 2012 Posts: 17 Rep Power: 14	Dear Community, Please offer help if you have exposure to simulating sloshing process at high pressure gradients. I have a fuel tank with 100 psi pressure inside. I have to simulate the sloshing during the loading of 11g downward and 7g horizontal.I have provided acceleration in the operating conditions. Two questions are there: 1. Solution diverging even with small time step (0.0005) 2. Should I provide 100 psi in operating condition and initialize with 100 psi. I think solution diverging due to adverse pressure gradient due to the high acceleration. How to overcome this problem? Thank you, rss

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November 29, 2012, 12:13		#2
sicfred New Member Elias Paez Join Date: Nov 2011 Location: Madrid Posts: 25 Rep Power: 14	I don't think the pressure is the problem. Did you check the courant number? did you use the variable time step? maybe you should decrease, even more the time step. Any way, 11g and 7g are VERY high loads, are they constant or time-depend? I'm curius, under what conditions do you have these loads?