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-   -   VOF & Variable Surface Tension in FLUENT (http://www.cfd-online.com/Forums/fluent/62656-vof-variable-surface-tension-fluent.html)

SeamusTCD March 16, 2009 12:05

VOF & Variable Surface Tension in FLUENT
 
Hi all,

I have been reading through many posts on the forum about the VOF model used in FLUENT and it's capabilities. I am however still slightly confused about one matter:

Is it possible to use the VOF model while also incorporating a surface tension that varies with temperature along and interface?

If so, how is this accomplished? Perhaps through a UDF or define/phases/interaction...?

I would like to model Marangoni or thermocapillary flow as air bubble grows in a liquid silicone oil layer.

Any help anybody can offer will be greatly appreciated.

P.S. I am using FLUENT 6.2.16 and also have access to 6.3 if necessary!

Jane March 18, 2009 22:22

Quote:

Originally Posted by SeamusTCD (Post 209641)
Hi all,

I have been reading through many posts on the forum about the VOF model used in FLUENT and it's capabilities. I am however still slightly confused about one matter:

Is it possible to use the VOF model while also incorporating a surface tension that varies with temperature along and interface?

If so, how is this accomplished? Perhaps through a UDF or define/phases/interaction...?

i haven't try this before but i thought the UDF able work with the surface tension varies with temperature

Apiano July 5, 2016 10:00

Through udf
 
This indeed is quite simple and it is posted in the fluent UDF manual.
You may modify this

/************************************************** *************
Surface Tension Coefficient UDF for the VOF Multiphase Model
************************************************** *************/

#include "udf.h"
DEFINE_PROPERTY(sfc, c, t)
{
real T = C_T(c,t);
return 1.35 - 0.004*T + 5.0e-6*T*T;
}


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