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Old   October 18, 2011, 10:35
Default Multiphase and MHD
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Dear CFD users,
can anyone tell me if the free surface model (VOF) is compatible with magnetohydro dynamics module (MHD) in CFX?
Has anyone of you experiences with MHD+VOF?

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Old   October 18, 2011, 16:58
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Glenn Horrocks
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I cannot see why it would not work. Have you checked the CFX product physics compatibility chart? You can get that from the ANSYS homepage.
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Old   October 19, 2011, 14:48
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Hi Glenn,
the problem is that I simulate a very easy case (a cube!) in which 2 fluids are in a domain (separated because of their density difference) and electricity pass through them. In case that I start the simulation with both VOF and MHD active, I get directly in the solver setting the famous error message. The problem can be solved if I use only one fluid and deactivate VOF.
I think the program can not calculate the electromagnetic field with volume fraction terminology. What do you think? Have you ever heard of a simulation with both models running at the same time?

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Old   October 19, 2011, 14:51
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in Ansys website I could not find anything stating if both models can be used at the same time. They only say that these models are available in CFX!
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Old   October 19, 2011, 17:44
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Glenn Horrocks
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"Famous error message" is not very useful. What error message?
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Old   October 20, 2011, 08:58
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Julio Mendez
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I think you can not use it, As far as I read about it.
The point is that those magnetic field will affect the motion withing domain.
Sometimes those changes effects are taking into consideration through the source terms, I have red about multiphase model and I have not read about those (MHD) terms on the source terms for multiphase models.
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Old   October 21, 2011, 09:53
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this is the error message:

+--------------------------------------------------------------------+
| Job Information |
+--------------------------------------------------------------------+


Run mode: serial run

Host computer: EMEIS261 (PID:4840)
Job started: Tue Oct 11 13:37:20 2011

Details of error:-
----------------
Error detected by routine PSHDIR
CDRNAM = ../../BPOT
CRESLT = NONE

Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/EQUATIONS/BPOT_FL2/TERM1

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine MEMERR |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+


End of solution stage.

This run of the ANSYS CFX Solver has finished.
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Old   October 22, 2011, 02:10
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Mauricio Labarca
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Hello aria, apparently the ansys documentation points that those subroutines (PSHDI, CDRNAM) are folder creation and most likely memory allocation (The MEMERR routine does sound like that) ; do try changing the solver parameters for allocating up to 1.4-1.5 memory. It does make sense it should happen when you have 2 fluids since you're adding complexity to the problem. See also if there are any changes when you change the mesh.
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Old   October 30, 2012, 10:23
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HI,I meet the same question as yours for a long time. But as i really read a paper about the multiphase with electric. i can not find the error in my program.
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