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-   -   how to setup sub/super sonic mixed boundaries (http://www.cfd-online.com/Forums/cfx/23482-how-setup-sub-super-sonic-mixed-boundaries.html)

steven January 3, 2007 12:26

how to setup sub/super sonic mixed boundaries
 
hi,

We are running a turbine simulation. The inlet local Mach number is 0.15 while the outlet is 1.1. All other conditions are available (inlet pressure, outlet pressure, inlet velocity, outlet velocity etc). What is the best way to set boundary conditions? and what is the best model to simulate in CFX-10?

Thanks a lot

HekLeR January 9, 2007 00:35

Re: how to setup sub/super sonic mixed boundaries
 
for this kind of case usually inlet total pressure & temperature with flow direction are used.

outlet... is that mach no. in the absolute or relative frame?

relative frame? you can use outlet static pressure or mass flow rate.

absolute frame? then probably a supersonic outlet and hope you can get the right pressure rise...


HekLeR January 9, 2007 00:36

Re: how to setup sub/super sonic mixed boundaries
 
it's a turbine...

of course i mean pressure drop not rise.


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