CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Are NS equations valid at very low pressure ??

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

LinkBack Thread Tools Display Modes
Old   August 1, 2007, 10:59
Default Are NS equations valid at very low pressure ??
Jiri Novak
Posts: n/a
What is the bottom pressure limit for NS to be valid in Fluent? I already know the theory of Knudsen Number and mean free path as mentioned in other discusion here... just want to know realistic pressure value above which Fluent calculates continuum flow correctly.

Anyway, does anyone have any experience with compresible gas flow at nearly vacuum conditions (1 - 200 Pa)? From my simulations, it seems that standard Fluent NS equations underpredict the flow field which is much slower than in experiment.

Thanks Jiri

  Reply With Quote


Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pressure enigma. Sara Main CFD Forum 22 July 30, 2009 04:46
Pressure calculation in Navier-Stokes equations Hadian Main CFD Forum 1 November 10, 2008 03:47
How to read pressure at discrete points paka OpenFOAM 15 July 21, 2008 05:03
Does star cd takes reference pressure? monica CD-adapco 1 April 19, 2007 11:26
regarding low pressure handling subodh kumar Main CFD Forum 1 November 20, 1999 23:23

All times are GMT -4. The time now is 05:20.