difference between interface compression and interface reconstruction

Niru · November 20, 2013, 20:43

In CFX, the free surface model with surface tensio force used interface compression. How is this different from interface reconstruction like PLIC algorithm. Can know the pros and cons of both.
What software uses interface reconstruction and compression.

Niru · November 20, 2013, 20:45

why is interface drag not modelled in homogeneous free surface model.

ghorrocks · November 21, 2013, 05:02

CFX uses a compressive scheme for the volume fraction. It does not have a reconstruct scheme like Fluent does.

There is no interface drag in homogenous flow - both phases by definition are moving with no relative slip because they are homogeneous! That is why there is no interface drag model.

Niru · January 5, 2014, 15:01

Can you please explain me how compressive scheme for volume fraction works in CFX. Are there any related equations.

ghorrocks · January 12, 2014, 07:11

I am not sure if it is in the documentation. If you cnanot find it then ask ANSYS support. I think the ANSYS CFX multiphase training course also covers it.

Niru · January 20, 2014, 17:05

Quote:

Originally Posted by ghorrocks

I am not sure if it is in the documentation. If you cnanot find it then ask ANSYS support. I think the ANSYS CFX multiphase training course also covers it.

Ok, I got the details of the model. Thanks.

mvo · July 14, 2016, 12:29

So far as I know uses ANSYS the CICSAM method for reconstructing the free surface. but I'm not 100 percent safe

here the link:

PHP Code:


			
http://www.ptmts.org/Waclaw-Koron-2-08.pdf

ghorrocks · July 14, 2016, 20:08

No, this is not correct. ANSYS CFX uses the compressive scheme (as mentioned previously in this thread).

ANSYS Fluent has CICSAM as an available option, you might be confused with that.

mvo · July 16, 2016, 05:11

Oh sorry for my mistake. I should read before i post something.

November 20, 2013, 20:43	difference between interface compression and interface reconstruction	#1
Niru Member niru Join Date: Apr 2012 Posts: 55 Rep Power: 14	In CFX, the free surface model with surface tensio force used interface compression. How is this different from interface reconstruction like PLIC algorithm. Can know the pros and cons of both. What software uses interface reconstruction and compression.

November 20, 2013, 20:45	interface drag in homogeneous free surface model	#2
Niru Member niru Join Date: Apr 2012 Posts: 55 Rep Power: 14	why is interface drag not modelled in homogeneous free surface model.

January 5, 2014, 15:01	compresive scheme	#4
Niru Member niru Join Date: Apr 2012 Posts: 55 Rep Power: 14	Can you please explain me how compressive scheme for volume fraction works in CFX. Are there any related equations.

July 14, 2016, 12:29		#7
mvo New Member Maximilian Join Date: Feb 2016 Location: RLP, Germany Posts: 6 Rep Power: 10	So far as I know uses ANSYS the CICSAM method for reconstructing the free surface. but I'm not 100 percent safe here the link: PHP Code: `http://www.ptmts.org/Waclaw-Koron-2-08.pdf`

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November 21, 2013, 05:02		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	CFX uses a compressive scheme for the volume fraction. It does not have a reconstruct scheme like Fluent does. There is no interface drag in homogenous flow - both phases by definition are moving with no relative slip because they are homogeneous! That is why there is no interface drag model.

January 12, 2014, 07:11		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	I am not sure if it is in the documentation. If you cnanot find it then ask ANSYS support. I think the ANSYS CFX multiphase training course also covers it.

July 14, 2016, 20:08		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	No, this is not correct. ANSYS CFX uses the compressive scheme (as mentioned previously in this thread). ANSYS Fluent has CICSAM as an available option, you might be confused with that.

July 16, 2016, 05:11		#9
mvo New Member Maximilian Join Date: Feb 2016 Location: RLP, Germany Posts: 6 Rep Power: 10	Oh sorry for my mistake. I should read before i post something.