VOF and gravity effect

sirpolar · July 31, 2015, 11:20

Hi every one

I ma using VOF for two phase flow, but when I enable gravity effect it has no effect at all. I was wondering if somebody could help me

For example consider a column filled with water, and another fluid is entering from the bottom of column, I expect that with enabling gravity I can see the hydrostatic pressure of water in the column, but it seems that the gravity has no effect on the pressure distribution at all.

Regards
sirpolar

FJSJ · August 3, 2015, 07:15

Hi Ebrahim,

I suppose that you are defining the lightest phase density as Specified Operating Density at the same time you define the gravity. In case yo have a compressible flow you need to specify 0 as value for that field.

July 31, 2015, 11:20	VOF and gravity effect	#1
sirpolar Member Ebrahim Join Date: Feb 2014 Posts: 57 Rep Power: 12	Hi every one I ma using VOF for two phase flow, but when I enable gravity effect it has no effect at all. I was wondering if somebody could help me For example consider a column filled with water, and another fluid is entering from the bottom of column, I expect that with enabling gravity I can see the hydrostatic pressure of water in the column, but it seems that the gravity has no effect on the pressure distribution at all. Regards sirpolar

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
coupling vof with single phase flow and gravity term	alame005	Main CFD Forum	7	August 6, 2013 11:02
coupling vof with single phase flow and gravity term	alame005	Main CFD Forum	0	August 2, 2013 14:37
Vof oulet bc with gravity	ktsai2003	OpenFOAM Running, Solving & CFD	2	June 30, 2009 05:38
VOF & gravity	azmir	Siemens	2	April 18, 2007 20:03
VOF gravity flow BC	Alexander Ladino	CFX	1	March 28, 2007 14:45

August 3, 2015, 07:15		#2
FJSJ Senior Member Javi Join Date: Jan 2013 Posts: 276 Rep Power: 16	Hi Ebrahim, I suppose that you are defining the lightest phase density as Specified Operating Density at the same time you define the gravity. In case yo have a compressible flow you need to specify 0 as value for that field.