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

Time-dependent BC's

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

LinkBack Thread Tools Display Modes
Old   December 25, 2010, 13:59
Default Time-dependent BC's
New Member
Join Date: Oct 2009
Posts: 24
Rep Power: 10
doodek is on a distinguished road

I have a small problem with time dependent boundary conditions.
I would like to solve rotor-stator problem (periodic subsection). How to obtain change of rotational speed with time? For example: for 0-10 second rotational speed 1000 rpm, for 10-20 s rotational speed 20 000 rpm. I have the same problem with pressure in inlet boundary condition. How to simulate sudden pressure jump in inlet (for example after 5. second)?
I would be grateful for all suggestions.

doodek is offline   Reply With Quote

Old   December 25, 2010, 18:09
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 14,336
Rep Power: 110
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Use a CEL expression to define the rotational speed or pressure as functions of time. You can either use a 1D interpolation function or CEL functions. V12 or earlier you have to use the step() function, V13 you can use if/then statements.
ghorrocks is offline   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
Modeling in micron scale using icoFoam m9819348 OpenFOAM Running, Solving & CFD 7 October 27, 2007 00:36
Transient simulation not converging skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48
timestep for time dependent RANS fab Main CFD Forum 4 May 2, 2005 01:29
time dependent curve faiz rauf FLUENT 0 August 31, 2004 13:02
Time Dependent Solutions. rakib FLUENT 2 June 28, 2000 07:39

All times are GMT -4. The time now is 15:02.