# Axis B.C in multiphase problem

 Register Blogs Members List Search Today's Posts Mark Forums Read

 December 22, 2011, 10:58 Axis B.C in multiphase problem #1 Member   Soroush Join Date: Mar 2010 Posts: 52 Rep Power: 9 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...

 December 22, 2011, 19:46 hi #2 Senior Member   shoeb khan Join Date: Nov 2011 Posts: 179 Rep Power: 8 Try to patch the region with the liquid instead of giving the udf. SHK SH_P likes this.

December 23, 2011, 02:50
#3
Member

Soroush
Join Date: Mar 2010
Posts: 52
Rep Power: 9
Quote:
 Originally Posted by shk12345 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...

December 23, 2011, 06:16
#4
Member

Soroush
Join Date: Mar 2010
Posts: 52
Rep Power: 9
Quote:
 Originally Posted by shk12345 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...

 December 23, 2011, 09:28 #5 Senior Member   shoeb khan Join Date: Nov 2011 Posts: 179 Rep Power: 8 take axis as a single axis and then try it.Dont divide it into zones.

December 23, 2011, 10:03
#6
Member

Soroush
Join Date: Mar 2010
Posts: 52
Rep Power: 9
Quote:
 Originally Posted by shk12345 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?

 December 23, 2011, 12:27 #7 Member   Soroush Join Date: Mar 2010 Posts: 52 Rep Power: 9 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.

 December 23, 2011, 12:32 #8 Member   Soroush Join Date: Mar 2010 Posts: 52 Rep Power: 9 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.

 December 24, 2011, 13:54 #9 Senior Member   shoeb khan Join Date: Nov 2011 Posts: 179 Rep Power: 8 hi try to the simulation with complete bubble in the center with walls on both the side. SHK

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post maysmech OpenFOAM 20 March 14, 2011 11:28 delaneyluke CFX 3 April 21, 2010 18:54 Amir Khodabandeh FLUENT 1 March 13, 2009 09:43 Yoo Main CFD Forum 0 February 19, 2006 10:49 Manoj Padmakarrao Raut Siemens 0 March 17, 2005 01:01

All times are GMT -4. The time now is 08:56.