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

ON/OFF mass flow at an inlet boundary condition

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 12, 2014, 07:12
Default ON/OFF mass flow at an inlet boundary condition
  #1
Member
 
AH
Join Date: Apr 2014
Posts: 59
Rep Power: 3
visitor is on a distinguished road
Dear sirs

Can any one help me in defining an on/off mass flow rate for a "mass flow inlet" boundary? Please.

Need to allow a mass flow rate example to pause (or off) every x seconds and then flow (or on) every x seconds.

A simple solution please.

Thanks
visitor is offline   Reply With Quote

Old   April 12, 2014, 12:07
Default
  #2
Senior Member
 
ghost82's Avatar
 
Daniele
Join Date: Oct 2010
Location: Italy
Posts: 899
Rep Power: 15
ghost82 will become famous soon enough
Hi,
I think it can be done with udf; read udf manual, section DEFINE_PROFILE; write a mass flow function of time using if sentences, for example if time >0 && time <5 than mass flow rate =10; elseif time >=5 && time <10 than mass flow rate =0; else mass flow rate=10

Or if you cannot write the udf you can simply stop the simulation and manually change mass flow rate values

Daniele
ghost82 is offline   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
Total pressure and mass flow boundary condition at inlet bscphil OpenFOAM Pre-Processing 2 April 19, 2015 07:56
Mass flow inlet Boundary condition prashantthaker208 FLUENT 1 November 2, 2013 07:19
Boudaries for bouynat driven flow with additional mass flux at inlet Charon CFX 2 April 27, 2013 08:02
Mass flow boundary condition Renato. Main CFD Forum 0 July 21, 2006 22:07
Mass flow boundary condition vivian Main CFD Forum 0 April 10, 2006 23:32


All times are GMT -4. The time now is 06:49.