Filling tank

MissCFD · November 6, 2019, 15:41

Hi,

I would like to simulate the filling of this closed tank. But I am wondering what is the condition that I need to put at the top of the tank (on the black line), a wall or an opening ? But if it’s an opening it’s not true that the air or the water can go out of this surface …

Thank you for your help !

Gert-Jan · November 7, 2019, 03:19

You should set an outlet with Degassing condition for the gasphase. Then only gas will leave the domain.

evcelica · November 7, 2019, 12:17

If it is a closed tank it will be closed, so a wall. You will be compressing the air inside then, so compressibility will have to be included for the gas. Does this pressure matter for your results of interest? If it does not do anything, then it will be much simpler to just use the outlet condition described by Gert-Jan.

MissCFD · November 15, 2019, 12:14

Thank you both for your reply.

I just want to see how the reservoir will fill.

I read the degassing condition is for a dispersed phase. In my case, I simulate water and air as a continuous phase ...

November 6, 2019, 15:41	Filling tank	#1
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 11	Hi, I would like to simulate the filling of this closed tank. But I am wondering what is the condition that I need to put at the top of the tank (on the black line), a wall or an opening ? But if it’s an opening it’s not true that the air or the water can go out of this surface … Thank you for your help ! Last edited by MissCFD; November 20, 2019 at 11:27.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ANSYS Fluent Sloshing in baffled tank simulation	Fisya	CFD Freelancers	2	August 27, 2019 17:55
Simple compressed air tank filling	abduly85	FLUENT	2	August 27, 2018 00:41
Filling Tank with Water	leff	CFX	7	August 21, 2017 07:47
BCs to the outlet patch (filling a simple tank)	Ternox	OpenFOAM Pre-Processing	4	August 21, 2017 07:19
Air tank filling	gsr_132	FLUENT	1	June 10, 2016 03:16

November 7, 2019, 03:19		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	You should set an outlet with Degassing condition for the gasphase. Then only gas will leave the domain.

November 7, 2019, 12:17		#3
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	If it is a closed tank it will be closed, so a wall. You will be compressing the air inside then, so compressibility will have to be included for the gas. Does this pressure matter for your results of interest? If it does not do anything, then it will be much simpler to just use the outlet condition described by Gert-Jan.

November 15, 2019, 12:14		#4
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 11	Thank you both for your reply. I just want to see how the reservoir will fill. I read the degassing condition is for a dispersed phase. In my case, I simulate water and air as a continuous phase ...