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Fluids list in multiphase flow problem

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Old   January 29, 2009, 12:58
Default Fluids list in multiphase flow problem
  #1
Piti
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I read ANSYS guidelines and I'm a bit confused. I would like to have water droplets flowing in saturated steam. The geometry is simple; vertical pipe and upward flow. I tried to choose steam5l and steam5v in Fluids list, but never get it to solve. When I chose only steam5vl, it's solved. Is the latter multiphase flow?

In the former situation, how can I get it solved? There are some error messages:

1st error message: While evaluating Steam5l.Local Speed of Sound, Static Pressure went outside of its upper limit. Its maximum value was 7.1391E+07. The bounds error was handled by clipping. If this situation persists, consider increasing the table range.

I tried to check "extrapolation" boxed for both temperature and pressure, but it didn't help; the error message is still there.

2nd error message: A wall has been placed at portion(s) of an OUTLET boundary condition (at 21.4% of the faces, 16.0% of the area) to prevent fluid from flowing into the domain. The boundary condition name is: Out. The fluid name is: Steam5v. If this situation persists, consider switching to an Opening type boundary condition instead

I tried to change "outlet" to "opening", but got this error message:

ERROR #001100279 has occurred in subroutine ErrAction. Message: The solver does not support combining Opening Pressure with Static Temperature or vice versa on openings for real gases

Thanks,
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Old   February 4, 2009, 10:33
Default Re: Fluids list in multiphase flow problem
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Rajee Assudani
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Yes, it is multiphase flow. Ignore the 2nd message (it's not an error) and use the outlet bc.
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