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

problems with rotatinig incompess. flow modelling

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 26, 2006, 00:35
Default problems with rotatinig incompess. flow modelling
  #1
vitmalin
Guest
 
Posts: n/a
Greetings everyone!

I've got a problem performing modeling of incompressible water flow in centrifugal pump on Fluent 6.1 (10000 rpm and 1e+5 as operational pressure). Namely, I obtain flow field with very large negative values of absolute pressures (i.e. -6e+5 Pa). May be the problem arises from unproperly defined periodic bc, which was created from non-comformal surface grids with the use of define>grid-int>make-period> then rotational periodicity and rotation angle (of course I define appropriate rotational axis). After this procedure new periodic-1 surface appears (with rotational pointer), but during the calculation I don't see periodic solution at all. In my case maximum positive and minimum negative pressures occur in the vicinity of the boundaries of periodic interfaces. Also I don't understand how negative absolute pressure could be obtained during the simulation while I define in solution>control>limits 1e+4 as minmal absolute pressure value? Could anyone tell me what is wrong with such formulation and how to solve this problem?
  Reply With Quote

Reply

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
Separation of Flow problems Simon c FLUENT 3 March 19, 2006 13:05
ask help on valve flow simulation(3D modelling) Anna FLUENT 0 July 18, 2003 17:39
Compressible Flow Modelling? yeo FLUENT 4 March 7, 2003 08:08
High speed flow problems Sawa FLUENT 3 January 14, 2003 02:10
Airpak: Problems with heat flow contour conditions Ivan de Miguel Urain FLUENT 1 November 16, 2001 10:36


All times are GMT -4. The time now is 11:34.