about degassing BC

jihyeong · March 30, 2011, 22:08

Hi all
I'm doing simulation by using VOF and DM with FLUENT
There are two phases like air, water in square .
then both air and water are compressed from bottom surface like piston moving.
all BCs are wall
but i want to make onlly air out at the top of the wall.
So Plz give me the UDF for degassing example.
I don't have any degassing UDF examples.
Plz email to me
rjhlbs@hotmail.com
plz

peaker007 · April 19, 2011, 00:51

I have the same question as you.I want to define a free surface which gas can vent out freely but liquid can not get out.But i don't know how to define such a boundary condition in a udf file.Can anyone help me and give me a example udf about it.

March 30, 2011, 22:08	about degassing BC	#1
jihyeong New Member jihyeong Join Date: Nov 2010 Posts: 5 Rep Power: 15	Hi all I'm doing simulation by using VOF and DM with FLUENT There are two phases like air, water in square . then both air and water are compressed from bottom surface like piston moving. all BCs are wall but i want to make onlly air out at the top of the wall. So Plz give me the UDF for degassing example. I don't have any degassing UDF examples. Plz email to me rjhlbs@hotmail.com plz Last edited by jihyeong; March 31, 2011 at 02:53.

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April 19, 2011, 00:51		#2
peaker007 New Member Join Date: Apr 2011 Posts: 9 Rep Power: 15	I have the same question as you.I want to define a free surface which gas can vent out freely but liquid can not get out.But i don't know how to define such a boundary condition in a udf file.Can anyone help me and give me a example udf about it.