CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Can fluent incorporate a pulsating wall motion?

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

LinkBack Thread Tools Display Modes
Old   January 15, 2006, 12:32
Default Can fluent incorporate a pulsating wall motion?
Himanshu Paliwal
Posts: n/a
If the wall shows a pulsating motion i.e. expansion and contraction and this propogates as a wave i.e if the boundary coordinates of wall are r = A(1 + cos ( 2*pi *(Z-ct)/ λ )) where A is the amplitude Z is the length of the track and c is the wave speed. This can happen if the wall is elastic in nature something like blood vessels or the food pipe i.e. oesophagus.
  Reply With Quote

Old   January 18, 2006, 05:10
Default Re: Can fluent incorporate a pulsating wall motion
Posts: n/a
If the oscillations amplitude A is small compared to the radius of the cylinder, it is possible...(A/R~0.01) You can model this effect by using not a WALL Boundary condition, but an inlet velocity boundary condition. You have to write an UDF for the velocity =dr/dt (function of time), and put this UDF into the velocity inlet at the normal velocity.

But be careffull on the grid size and time step that you have to use, which depends on c and lambda....
  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
Fluent Mesh to OpenFoam: Internal Surface has to be a wall sebastian OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 6 October 21, 2010 04:36
define wall in fluent when hooking grid motion iman_1844 FLUENT 0 August 6, 2010 13:56
Problem in IMPORT of ICEM input file in FLUENT csvirume FLUENT 2 September 9, 2009 01:08
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug unoder OpenFOAM Installation 11 January 30, 2008 21:30
Wall function problem in Fluent mefpz FLUENT 1 October 10, 2007 13:43

All times are GMT -4. The time now is 11:25.