CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Boundary condition - FFT

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

LinkBack Thread Tools Display Modes
Old   June 22, 2010, 02:55
Default Boundary condition - FFT
New Member
Join Date: Jun 2010
Location: London
Posts: 3
Rep Power: 9
cfdapprentice is on a distinguished road
Boundary condition - FFT

I am working on simulating a two-phase flow 3-D fluidized bed. It is a granular flow interacting with gas.

When I created my mesh, the bottom part was declared as a “velocity-inlet”. Mainly walls on the sides and the top part is the outlet.

My question is:

I am not sure if I should declare it as “outflow” or “pressure-outlet”.

Can somebody tell what is more appropriate and explain me the difference between them?

The reason why I am asking the above question is because I am also trying to get the
FFT (Power Spectral Estimate) x frequency graph of the vertical forces.

Thank you!
cfdapprentice is offline   Reply With Quote

Old   June 23, 2010, 00:14
New Member
Join Date: Jun 2010
Location: London
Posts: 3
Rep Power: 9
cfdapprentice is on a distinguished road
After asking some people, I got the answer to my question.
It might help others so I decided to post.

Since it is a two-phase flow, it is more apropriate to use "outflow".
"Pressure-outlet" is used mostly for gas.
cfdapprentice is offline   Reply With Quote

Old   July 9, 2010, 05:42
New Member
Join Date: Feb 2010
Posts: 9
Rep Power: 9
sri99iitm is on a distinguished road
hi ..did u completed 3d fludized bed simulation ..can u send case n data file to me plzzz.
if u dont have help me out plz..i have some doubts pertaining to udf and under relaxation factors ...
thx for telling it outflow . Its been very helpful for me
thx for replying in advance
sri99iitm is offline   Reply With Quote


boundary condition

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
Boundary Conditions Thomas P. Abraham Main CFD Forum 20 July 7, 2013 05:05
Transient outlet boundary condition problem jwillie2000 CFX 1 December 7, 2009 18:07
Axis Boundary Condition..what is it? CFDtoy FLUENT 6 February 13, 2007 06:51
How to set boundary condition in Fluent for the fo Peiyong FLUENT 1 November 10, 2006 12:44
How to resolve boundary condition problem? sam FLUENT 2 July 20, 2003 02:19

All times are GMT -4. The time now is 03:26.