Control of volume fraction

rakadit · August 8, 2011, 08:13

Dear Friends,

I am modeling two phase flow using Eulerian model.The problem is that I am getting velocity of fluid even where volume fraction is zero.

for your kind information, I am using wall shear UDF in this simulation.
Please guide ,what can be reason for this and how to set velocity of fluid zero at the place where volume fraction is zero.

Thanks,

Rakesh

leflix · August 13, 2011, 13:18

Hi Rakesh,

Is the fluid phase supposed to be incompressible? If yes which velocity-pressure coupling algorithm do you use ?

rakadit · August 19, 2011, 00:52

Dear Leflix,

Sorry for late response.

Thank you very much for your reply. yes, I am considering incompressible multiphase flow .I am using pressure based Fluent 6.3 Sover.

regards,

Rakesh

leflix · August 19, 2011, 05:15

Hi Rakesh,

first of all the volume fraction of a given cell can never be zero, since even in the case of very dense particle packing there is always small interstices of fluid.

do you know which velocity-pressure algorithm is used in Fluent to handle the volume-averaged Navier-Stokes and continuity equation?

August 8, 2011, 08:13	Control of volume fraction	#1
rakadit Member Rakesh Join Date: May 2011 Posts: 33 Rep Power: 14	Dear Friends, I am modeling two phase flow using Eulerian model.The problem is that I am getting velocity of fluid even where volume fraction is zero. for your kind information, I am using wall shear UDF in this simulation. Please guide ,what can be reason for this and how to set velocity of fluid zero at the place where volume fraction is zero. Thanks, Rakesh

August 19, 2011, 00:52	Volume fraction	#3
rakadit Member Rakesh Join Date: May 2011 Posts: 33 Rep Power: 14	Dear Leflix, Sorry for late response. Thank you very much for your reply. yes, I am considering incompressible multiphase flow .I am using pressure based Fluent 6.3 Sover. regards, Rakesh

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[blockMesh] BlockMesh FOAM warning	gaottino	OpenFOAM Meshing & Mesh Conversion	7	July 19, 2010 14:11
interDyMFoam - change in volume fraction	gopala	OpenFOAM Running, Solving & CFD	0	April 27, 2009 10:46
On the damBreak4phaseFine cases	paean	OpenFOAM Running, Solving & CFD	0	November 14, 2008 21:14
fluent add additional zones for the mesh file	SSL	FLUENT	2	January 26, 2008 11:55
[blockMesh] Axisymmetrical mesh	Rasmus Gjesing (Gjesing)	OpenFOAM Meshing & Mesh Conversion	10	April 2, 2007 14:00

August 13, 2011, 13:18		#2
leflix Senior Member Join Date: Aug 2011 Posts: 272 Rep Power: 15	Hi Rakesh, Is the fluid phase supposed to be incompressible? If yes which velocity-pressure coupling algorithm do you use ?

August 19, 2011, 05:15		#4
leflix Senior Member Join Date: Aug 2011 Posts: 272 Rep Power: 15	Hi Rakesh, first of all the volume fraction of a given cell can never be zero, since even in the case of very dense particle packing there is always small interstices of fluid. do you know which velocity-pressure algorithm is used in Fluent to handle the volume-averaged Navier-Stokes and continuity equation?