CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Intermittent inlet feed based on pressure/time

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 27, 2017, 21:42
Post Intermittent inlet feed based on pressure/time
  #1
New Member
 
Michael
Join Date: Jul 2017
Posts: 7
Rep Power: 5
Aeromidd is on a distinguished road
Is it possible to make a mass flow inlet (or any other kind of inlet) something that intermittently opens and shuts off flow based on either local pressure gradients or a timestep?
How might I do that?

I'm trying to see if I can simulate the behaviour of a clapper valve / pulse jet combustion process.
Aeromidd is offline   Reply With Quote

Old   July 28, 2017, 02:36
Default
  #2
Senior Member
 
Ashok Chaudhari
Join Date: Aug 2016
Location: Pune, India
Posts: 243
Rep Power: 7
ashokac7 is on a distinguished road
Send a message via Skype™ to ashokac7
Yes. I didn't try it. But we can use Stagnation inlet to define pressure as your inlet condition. If pees sure n region goes above the stagnation inlet then flow should stop. But it may give reverse flow. To avoid reverse flow you can define stagnation inlet pressure as a field function such that it is constant when local pressure is less and it is equal to local pressure when local pressure crosses stagnation boundary condition pressure value. Hope this helps. 😊🤗

Sent from my Redmi Note 3 using CFD Online Forum mobile app
ashokac7 is offline   Reply With Quote

Old   July 28, 2017, 13:24
Default
  #3
New Member
 
Michael
Join Date: Jul 2017
Posts: 7
Rep Power: 5
Aeromidd is on a distinguished road
Cool, thanks very much! Follow up newbie question... how exactly do I implement that in the field function code? How do I describe pressure at the local region? I can't find anything on the list of functions available that defines local pressure. Or do I have to augment a pressure scalar via the position variable somehow?

Thanks
Aeromidd is offline   Reply With Quote

Reply

Tags
inlet, intermittent

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
intermittent inlet condition for channel flow simulation waku2005 OpenFOAM Running, Solving & CFD 1 August 1, 2014 01:14
UDF profile: Fluent method for coupling inlet and outlet I-mech Fluent UDF and Scheme Programming 0 May 10, 2014 11:36
How can I fix a local coordinate system to the inlet phys-zephyr STAR-CCM+ 3 May 8, 2014 06:46
Species mass flow inlet lorenz FLUENT 3 March 15, 2012 08:26
Validation 12.1 vs 6.3, Difference in Reported Inlet Total Pressure jola FLUENT 1 May 5, 2011 15:33


All times are GMT -4. The time now is 10:42.