Corresponding model for VOF

yaseen wsu · November 6, 2015, 12:19

What is the corresponding model for VOF ( in FLUENT) in ANSYS CFX, in CFX only there is a multi phase - check box for homogeneous.

ghorrocks · November 8, 2015, 06:00

That's right, the corresponding model is multiphase with homogeneous velocity fields.

yaseen wsu · November 8, 2015, 06:18

Glenn Horrocks thanks a lot but what about homogeneous velocity field, if velocity in non homogeneous in x-y-z directions?

ghorrocks · November 8, 2015, 06:20

Then don't select the homogeneous model - and you will be using a eularian-eularian model with interphase slip.

But I suspect I misunderstand you. Can you explain what the flow you are trying to model is?

yaseen wsu · November 9, 2015, 12:44

OK, flow of water in side channel spillway as shown in fig. water from reservoir in three side with high velocity enter a channel (called spatially varied flow) shown in fig. If the check box of homogeneous is unchecked this is eularian-eularian model??
http://www.cfd-online.com/Forums/att...1&d=1447087300
http://www.cfd-online.com/Forums/att...1&d=1447087427

ghorrocks · November 9, 2015, 17:10

Correct. Make sure you read the CFX documentation on these models so you know what the options mean.

yaseen wsu · November 10, 2015, 14:50

I read some document about CFX, can you say more specific? did you agree with using homogeneous model and SST turbulent model? thanks.

ghorrocks · November 10, 2015, 20:48

The documentation explains the things to consider when deciding between homogeneous and non-homogeneous. The main thing is whether a single resolvable interface between air and water exists or whether there is significant small features (foam, bubbles, spray etc).

If you are going to do multiphase simulation in CFX I strongly recommend you spend the time to read ALL the multiphase section in all the CFX manuals. They have many recommendations for model implementation, meshing and many other factors.

November 6, 2015, 12:19	Corresponding model for VOF	#1
yaseen wsu Senior Member yaseen Join Date: Oct 2015 Location: Hawler Posts: 174 Rep Power: 12	What is the corresponding model for VOF ( in FLUENT) in ANSYS CFX, in CFX only there is a multi phase - check box for homogeneous.

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November 8, 2015, 06:00		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	That's right, the corresponding model is multiphase with homogeneous velocity fields.

November 8, 2015, 06:18		#3
yaseen wsu Senior Member yaseen Join Date: Oct 2015 Location: Hawler Posts: 174 Rep Power: 12	Glenn Horrocks thanks a lot but what about homogeneous velocity field, if velocity in non homogeneous in x-y-z directions?

November 8, 2015, 06:20		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	Then don't select the homogeneous model - and you will be using a eularian-eularian model with interphase slip. But I suspect I misunderstand you. Can you explain what the flow you are trying to model is?

November 9, 2015, 12:44		#5
yaseen wsu Senior Member yaseen Join Date: Oct 2015 Location: Hawler Posts: 174 Rep Power: 12	OK, flow of water in side channel spillway as shown in fig. water from reservoir in three side with high velocity enter a channel (called spatially varied flow) shown in fig. If the check box of homogeneous is unchecked this is eularian-eularian model?? http://www.cfd-online.com/Forums/att...1&d=1447087300 http://www.cfd-online.com/Forums/att...1&d=1447087427

November 9, 2015, 17:10		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	Correct. Make sure you read the CFX documentation on these models so you know what the options mean.

November 10, 2015, 14:50		#7
yaseen wsu Senior Member yaseen Join Date: Oct 2015 Location: Hawler Posts: 174 Rep Power: 12	I read some document about CFX, can you say more specific? did you agree with using homogeneous model and SST turbulent model? thanks.

November 10, 2015, 20:48		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	The documentation explains the things to consider when deciding between homogeneous and non-homogeneous. The main thing is whether a single resolvable interface between air and water exists or whether there is significant small features (foam, bubbles, spray etc). If you are going to do multiphase simulation in CFX I strongly recommend you spend the time to read ALL the multiphase section in all the CFX manuals. They have many recommendations for model implementation, meshing and many other factors.