Multiphase simulation - VOF/Free surface

100tinela · May 20, 2011, 23:01

Hi everyone,

I've been simulating a multiphase flow for a while (free surface type), but I can't find anywhere further information about CFX's discretization method of volume fraction equation, only that is a "unique compressive discretization scheme for the calculation of phasic volume fractions".
I know this method is not the reconstruction and propagation type normally used in VOF formulation, but I just can't find any reference more specific about this method.
Besides, I realized the variable "interface compression level" used in CFX seems to be very similar to the "slope limiter value" used in compression scheme for VOF in FLUENT.

Anybody knows if they are just the same?

I would appreciate any help,
Willian

ghorrocks · May 21, 2011, 08:46

It is a proprietary scheme I understand so is not public described in detail. It is the same as the compressive VOF scheme in Fluent - it was ported from CFX to Fluent for the last release. The best I can suggest is it is similar to the HRIC scheme from Fluent, but my experience in Fluent confirms it is better than HRIC.

ghorrocks · May 21, 2011, 08:53

It is a proprietary scheme I understand so is not public described in detail. It is the same as the compressive VOF scheme in Fluent - it was ported from CFX to Fluent for the last release. The best I can suggest is it is similar to the HRIC scheme from Fluent, but my experience in Fluent confirms it is better than HRIC.

100tinela · May 21, 2011, 15:06

Yes, now I can understand why I can't find the following reference anywhere:

Zwart PJ, Scheurer M, Bogner M, Free surface flow modelling of an impinging
jet. In: ASTAR international workshop on advanced numerical methods for
multidimensional simulation of two-phase flow. GRS Garching, Germany; 2003

Anyway, I'll take a look on HRIC scheme.

Thanks for your help Glenn

May 20, 2011, 23:01	Multiphase simulation - VOF/Free surface	#1
100tinela New Member Willian Join Date: Jan 2010 Location: Brasil Posts: 22 Rep Power: 16	Hi everyone, I've been simulating a multiphase flow for a while (free surface type), but I can't find anywhere further information about CFX's discretization method of volume fraction equation, only that is a "unique compressive discretization scheme for the calculation of phasic volume fractions". I know this method is not the reconstruction and propagation type normally used in VOF formulation, but I just can't find any reference more specific about this method. Besides, I realized the variable "interface compression level" used in CFX seems to be very similar to the "slope limiter value" used in compression scheme for VOF in FLUENT. Anybody knows if they are just the same? I would appreciate any help, Willian

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May 21, 2011, 08:46		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	It is a proprietary scheme I understand so is not public described in detail. It is the same as the compressive VOF scheme in Fluent - it was ported from CFX to Fluent for the last release. The best I can suggest is it is similar to the HRIC scheme from Fluent, but my experience in Fluent confirms it is better than HRIC.

May 21, 2011, 08:53		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	It is a proprietary scheme I understand so is not public described in detail. It is the same as the compressive VOF scheme in Fluent - it was ported from CFX to Fluent for the last release. The best I can suggest is it is similar to the HRIC scheme from Fluent, but my experience in Fluent confirms it is better than HRIC.

May 21, 2011, 15:06		#4
100tinela New Member Willian Join Date: Jan 2010 Location: Brasil Posts: 22 Rep Power: 16	Yes, now I can understand why I can't find the following reference anywhere: Zwart PJ, Scheurer M, Bogner M, Free surface flow modelling of an impinging jet. In: ASTAR international workshop on advanced numerical methods for multidimensional simulation of two-phase flow. GRS Garching, Germany; 2003 Anyway, I'll take a look on HRIC scheme. Thanks for your help Glenn