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Old   February 26, 2015, 06:06
Default Simple steam ball valve
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Hello FloEFD users

I am writing in order to help. I would like to make CFD simulation of simple ball valve. The medium is a steam.

I would like to simulate flow at 100C which corresponds with the pressure +- 0.1Mpa. (according to thermomechanical tables).

Mass flow rate: m=0.001329kg/s

Could anyone help me with setting of boundary conditions and other parameters to get relevant results ? Because setting the mass flow as a inlet and static pressure as a outlet seems to be strange.

Thank you very much
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Old   February 26, 2015, 20:51
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Hi fazolex,

Can you elaborate more on what went wrong?

Is there a warning message under info when running the simulation?

Also looking at the picture you provided it seems you made "mass-flow as Outlet" and "pressure Opening"(not pressure outlet) at the other end.
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Old   February 27, 2015, 05:31
Default Steam valve
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Hello will321321,

The pictures you can see in attachment represents:

-inlet mass flow 0.001329kg/s (steam)
-pressure openings - static pressure.

Initial pressure corresponds to thermomechanic table for 100C = 101325Pa.

I am not sure obout setting of the initial velocity (for X axis). At some tutorials I found "Dependency" configuration which takes into account Re, velocity, viscosity and tube diameter. My question is: Is it needen to be set ?

Btw I ran the simulation but I got several error messages, as you can see in the pictures. I cant evaluate the result of the the Mach speed but the small space around the ball will probably cause problem.

Thank you very much for any advice.

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