CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens

compressible subsonic flow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 23, 2003, 11:20
Default compressible subsonic flow
  #1
Joel
Guest
 
Posts: n/a
Hi I am dealing in a medium that is compressible at subsonic speeds using the dubroutine densit. The compressibility is dictated purely by pressure and not by temperature denisty=logarithmic function of pressure plus reference density if you know what i mean. I have programmed DENP as the above relationship and DENS as DENREF+DENP, is this right? i am getting an error at the begining of my simulation that densit is activated but not used, is this because the flow is subsonic or is my programming wrong, also it says that DENP is not defined but this is after the initial error and i pressume is due to the densit not being used. Any ideas? Cheers Joel
  Reply With Quote

Old   April 23, 2003, 11:34
Default Re: compressible subsonic flow
  #2
jetset
Guest
 
Posts: n/a
Hi Joel,

If it says a subroutine is activated but not used, it generally means that you haven't linked the coding in. Check that in your working directory there is a subdirectory called "ufile", that your coding is in there and stored as a file called densit.f.

Next, run starlink and answer "yes" to the question relating to user coding. starlink should then tell you that it has compiled densit.f.

Then run it again. Seeya.
  Reply With Quote

Old   April 24, 2003, 09:18
Default Re: compressible subsonic flow
  #3
Joel
Guest
 
Posts: n/a
cheers, for that it was just me being stupid in the end and not flicking the right switch as it were. Having got the subroutine itself working i am having trouble with the simulation. I think there is a problem with dendp i am not entirely sure what Dendp and den should be. As i said before my density is directly related to pressure alone by logathmic relationship. Is this relationship Den and if so what is DENP supposed to be
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
subsonic flow anitha Main CFD Forum 4 March 16, 2006 10:59
Turbulent compressible and subsonic gas flow Rasmus Gjesing (Gjesing) OpenFOAM Running, Solving & CFD 42 May 30, 2005 14:38
bench mark for subsonic compressible turbulent fl javadi Main CFD Forum 0 June 14, 2004 09:40
need tubulence compressible subsonic benchmark javadi Main CFD Forum 1 June 14, 2004 09:36
Sphere in a subsonic flow Rameez Main CFD Forum 0 September 15, 1999 21:51


All times are GMT -4. The time now is 02:05.