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

oscillating flow

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 21, 2006, 05:02
Default oscillating flow
  #1
bb
Guest
 
Posts: n/a
hello!

I would like to simulate oscillating flow through a nozzle, and the frequency is very high (approximately 1000-2000Hz).

I dont have any experience with that kind of simulations so I would like to know what is the best approach.

For instance how do I define velocity inlet with oscillating flow?

thanx for, I am sure I will have further questions!

BB
  Reply With Quote

Old   February 21, 2006, 05:33
Default Re: oscillating flow
  #2
mAx
Guest
 
Posts: n/a
hi, you have to describe you velocity inlet with a UDF, just like this example (UDF MANUAL) /************************************************** ********************

unsteady.c

UDF for specifying a transient velocity profile boundary condition ************************************************** *********************/

#include "udf.h"

DEFINE_PROFILE(unsteady_velocity, thread, position) { face_t f; real t = CURRENT_TIME;

begin_f_loop(f, thread)

{

F_PROFILE(f, thread, position) = 20. + 5.0*sin(10.*t);

} end_f_loop(f, thread) }

  Reply With Quote

Old   February 22, 2006, 02:24
Default Re: oscillating flow
  #3
Kharicha
Guest
 
Posts: n/a
With so high frequency, it is better to use a turbulence model...set the mean velocity, and through the amplitude of oscillations you can fix the turbulence intensity....
  Reply With Quote

Reply


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
transform navier-stokes eq. to euler-eq. pxyz Main CFD Forum 37 July 7, 2006 09:42
Flow oscillating device, FLUID141/FLUID142... BV Main CFD Forum 0 February 24, 2006 13:57
Can 'shock waves' occur in viscous fluid flows? diaw Main CFD Forum 104 February 16, 2006 06:44
oscillating flow Glenn FLUENT 0 July 11, 2002 11:33
mass flow inlet Denis Tschumperle FLUENT 7 August 9, 2000 03:19


All times are GMT -4. The time now is 22:36.