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Axis B.C in multiphase problem

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Old   December 22, 2011, 10:58
Default Axis B.C in multiphase problem
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Soroush
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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...

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Old   December 22, 2011, 19:46
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shoeb khan
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Try to patch the region with the liquid instead of giving the udf.

SHK
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Old   December 23, 2011, 02:50
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Quote:
Originally Posted by shk12345 View Post
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...
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Old   December 23, 2011, 06:16
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Quote:
Originally Posted by shk12345 View Post
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...
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Old   December 23, 2011, 09:28
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take axis as a single axis and then try it.Dont divide it into zones.
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Old   December 23, 2011, 10:03
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Quote:
Originally Posted by shk12345 View Post
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?
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Old   December 23, 2011, 12:27
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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.
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Old   December 23, 2011, 12:32
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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.
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Old   December 24, 2011, 13:54
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hi
try to the simulation with complete bubble in the center with walls on both the side.
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