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

How to force swirl motion in converge

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

Like Tree1Likes
  • 1 Post By nitesh.attal

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 4, 2021, 14:07
Question How to force swirl motion in converge
  #1
New Member
 
Usama Bin Khalid
Join Date: Aug 2019
Location: CMT, Motores Termicos, Valencia, Spain
Posts: 13
Rep Power: 3
usamaubk is on a distinguished road
Hello,
I am simulating a simple geometry including only piston, liner and head. I am simulating it from IVC-EVO with no combustion (only air). The rpm is around 1250. The swirl setting are default. but when I visualize it in paraview, strangely there is no swirl motion and all the vectors are pointing in the up direction (towards TDC). Like there is no direction change too and no swirl. So any idea how can i force swirl motion into the converge.
Attached Images
File Type: jpg g.22.jpg (43.1 KB, 15 views)
usamaubk is offline   Reply With Quote

Old   March 4, 2021, 15:25
Default
  #2
Member
 
nitesh.attal's Avatar
 
Nitesh Attal
Join Date: Sep 2017
Location: Convergent Science, Northville MI
Posts: 99
Rep Power: 5
nitesh.attal is on a distinguished road
Quote:
Originally Posted by usamaubk View Post
Hello,
I am simulating a simple geometry including only piston, liner and head. I am simulating it from IVC-EVO with no combustion (only air). The rpm is around 1250. The swirl setting are default. but when I visualize it in paraview, strangely there is no swirl motion and all the vectors are pointing in the up direction (towards TDC). Like there is no direction change too and no swirl. So any idea how can i force swirl motion into the converge.



Hello,


Please make sure you have used non-zero value for swirl ratio in engine.in file.



Let me know if that worked.


Best,
Nitesh
usamaubk likes this.
__________________
Nitesh Attal
Sr. Research Engineer | Applications
CONVERGECFD
nitesh.attal is offline   Reply With Quote

Old   March 8, 2021, 16:58
Default
  #3
New Member
 
Usama Bin Khalid
Join Date: Aug 2019
Location: CMT, Motores Termicos, Valencia, Spain
Posts: 13
Rep Power: 3
usamaubk is on a distinguished road
Quote:
Originally Posted by nitesh.attal View Post
Hello,


Please make sure you have used non-zero value for swirl ratio in engine.in file.



Let me know if that worked.


Best,
Nitesh
Hello,
Thanks. yes putting the swirl ratio as non zero worked and I was able to generate swirl. But:
Actually, I am trying to match the experimental heat transfer rate. previously there was no swirl so the HT rate was low. As per your suggestion, I increased the swirl ratio to like 40 and I was able to match exp. data but that's doesn't look realistic. I plotted vectors in paraform and turns out the swirl, in the beginning, like at IVC is too much that seems unrealistic and after IVC it starts to disappear.
Any other suggestions to increase the HT rate. I also tried running the simulation for more cycles and then mapped that data to the IVC but still, HT rate is same infact decreased.. So any suggestion will be helpful..
usamaubk is offline   Reply With Quote

Reply

Tags
converge cfd, swirl, swirl flow

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
viscous Force in UDF-File force_95 FLUENT 0 September 26, 2019 04:16
Quantifying the swirl in CFX, Swirl Number/Swirl Angle tauqirnawaz CFX 23 July 24, 2016 22:28
motion due to waves force using 6DoF glazejimmy FLUENT 0 September 10, 2015 12:06
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
DEFINE_CG_MOTION and pressure force Teo Fumagalli FLUENT 0 April 11, 2008 10:25


All times are GMT -4. The time now is 15:24.