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-   -   Axis B.C in multiphase problem (http://www.cfd-online.com/Forums/fluent/95571-axis-b-c-multiphase-problem.html)

 SH_P December 22, 2011 10:58

Axis B.C in multiphase problem

Hi,
I am going to simulate a drop in a tank (2 phases), using VOF model. my geometery is 2D with a axis, as shown in the figure and I impose the initial position of the drop using UDF, but I'm getting error when I try to solve the problem in Fluent. I think the problem arise from the axis BC. and its portion with different phase.
Does anybody have any idea how to fix it...?
Thanks...

http://s2.picofile.com/file/7221308381/Untitled_1.jpg

 shk12345 December 22, 2011 19:46

hi

Try to patch the region with the liquid instead of giving the udf.

SHK

 SH_P December 23, 2011 02:50

Quote:
 Originally Posted by shk12345 (Post 336815) Try to patch the region with the liquid instead of giving the udf. SHK
Thanks for your answer, but could you please explain in more detail what is the meaning of patching a region. I am somewhat new to Fluent...

 SH_P December 23, 2011 06:16

Quote:
 Originally Posted by shk12345 (Post 336815) Try to patch the region with the liquid instead of giving the udf. SHK
I tried patching, but I still get AMG Solver error in Fluent solver.I thinks there is a problem with my mesh and the way I define faces in it. my mesh consists of two faces (drop and surrounding) with axis composed of 3 segments. Do you have any idea how to resolve the problem?
Thanks...

 shk12345 December 23, 2011 09:28

take axis as a single axis and then try it.Dont divide it into zones.

 SH_P December 23, 2011 10:03

Quote:
 Originally Posted by shk12345 (Post 336855) take axis as a single axis and then try it.Dont divide it into zones.
How can I make to different faces without separating axis?

 SH_P December 23, 2011 12:27

I defined a region in adopt window in Fluent and patched it, also my axis is composed of only one segment. but I still get the AMG Sokver Error.

 SH_P December 23, 2011 12:32

I think the problem is originated from axis BC itself because I get the same error even without any drop defined in the domain (with only one phase in VOF), whereas I have no problem when I change the axis into wall.

 shk12345 December 24, 2011 13:54

hi
try to the simulation with complete bubble in the center with walls on both the side.
SHK

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