CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Pressure inlet problems

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

LinkBack Thread Tools Search this Thread Display Modes
Old   January 17, 2006, 04:53
Default Pressure inlet problems
Posts: n/a
Hi all, I have a supersonic compressible flow and am using a UDF to define the the total pressure at the inlet. I started by ignoring the Supersonic/initial gauge pressure and got a result which looked wrong. I then changed the initial(static) pressure to the same as the total pressure and get an error after a few time steps. Any ideas or experience with this sort of problem would help a great deal. Thanks.
  Reply With Quote

Old   January 18, 2006, 23:52
Default Re: Pressure inlet problems
Prabakaran M K
Posts: n/a
In case steady state, For example,give Total Pressure = 50bar/5000000pa and initial static gauge pr = 49bar/4900000pa. [Gauge pr = absolute pr - 1 ] Then, start with low underrelaxation and increase it for the convergence.

In case of transient, write udf for both Total pr and initial static gauge pr. with respect to time. and reduce the time step to very low (depending on geometry,complexity of flow, mesh )

Regards, M K P
  Reply With Quote


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
[ICEM] Problems with coedge curves and surfaces tommymoose ANSYS Meshing & Geometry 6 December 1, 2020 11:12
pressure inlet bc in fluent nikhil FLUENT 0 June 28, 2010 16:30
problems about pressure inlet majie FLUENT 2 October 6, 2006 08:30
Setting pressure and velocity in inlet Asghari FLUENT 5 September 22, 2006 13:23
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 22:02

All times are GMT -4. The time now is 18:20.