CFX import velocity

hamednadi · May 3, 2013, 05:03

i am modeling a domain with 2 phases (air-water)
for defining model, i selected continues fluid for air and water.i export water.superficial velocity(x,y,z) to a new file and import it to a new domain with sediment and put it on the sediment but sediment volume fraction dosn't have any change. can you help me?

ghorrocks · May 3, 2013, 07:00

Do you mean your sediment volume fraction initial condition is ignored? Can you post the CCL?

hamednadi · May 4, 2013, 00:09

my sediment topography dosnt have any change
it behave such a rigid bed without any change (without any erosion)
i import the velocity bc-profile from water-Air modeling but i increase y-axis height of profile to putting it on the sediment.
can i send .def file to your e-mail?

hamednadi · May 4, 2013, 00:24

it is ccl file of modeling

ghorrocks · May 5, 2013, 08:10

I am not sure, but I suspect CFX needs the velocity variable to initialise the velocity in the porous region, not the superficial velocity variable. I think the superficial velocity variable is calculated from the velocity variable, not the other way around.

hamednadi · May 5, 2013, 09:56

do you have proposal to modeling this problem.
my model have 3 phases (air water sediment). sediment phase is assumed as dispersed solid and water is flowing on it. sediment topography changes is required.

ghorrocks · May 5, 2013, 18:48

CFX can model many applications of this, but some it cannot. For instance CFX does not have a sedimentation/scouring model.

May 3, 2013, 05:03	CFX import velocity	#1
hamednadi New Member Join Date: May 2013 Posts: 4 Rep Power: 12	i am modeling a domain with 2 phases (air-water) for defining model, i selected continues fluid for air and water.i export water.superficial velocity(x,y,z) to a new file and import it to a new domain with sediment and put it on the sediment but sediment volume fraction dosn't have any change. can you help me?

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May 3, 2013, 07:00		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,701 Rep Power: 143	Do you mean your sediment volume fraction initial condition is ignored? Can you post the CCL?

May 4, 2013, 00:09		#3
hamednadi New Member Join Date: May 2013 Posts: 4 Rep Power: 12	my sediment topography dosnt have any change it behave such a rigid bed without any change (without any erosion) i import the velocity bc-profile from water-Air modeling but i increase y-axis height of profile to putting it on the sediment. can i send .def file to your e-mail?

May 5, 2013, 08:10		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,701 Rep Power: 143	I am not sure, but I suspect CFX needs the velocity variable to initialise the velocity in the porous region, not the superficial velocity variable. I think the superficial velocity variable is calculated from the velocity variable, not the other way around.

May 5, 2013, 09:56		#6
hamednadi New Member Join Date: May 2013 Posts: 4 Rep Power: 12	do you have proposal to modeling this problem. my model have 3 phases (air water sediment). sediment phase is assumed as dispersed solid and water is flowing on it. sediment topography changes is required.

May 5, 2013, 18:48		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,701 Rep Power: 143	CFX can model many applications of this, but some it cannot. For instance CFX does not have a sedimentation/scouring model.