[ICEM] Ahmed body Hexa mesh (with legs)

Far · October 29, 2012, 13:42

Previously I showed the Ahmed's body mesh without legs. This time legs are also included. First o-grid is made around main body and then around two legs up to the road surface (bottom)

Far · October 29, 2012, 23:07

Video clip (50 minutes and voice is also included) and other necessary files are also available.

PSYMN · November 5, 2012, 14:11

Available where?

diamondx · November 5, 2012, 14:22

Far's channel : http://www.youtube.com/user/turboeng.../videos?view=0

PSYMN · November 5, 2012, 14:28

I figured I would ask just to get the link up on this thread

Far · November 5, 2012, 21:04

Quote:

Originally Posted by PSYMN

I figured I would ask just to get the link up on this thread

Thankyou Simon. Here are the links to four videos on Ahmed body meshing and simulation.

http://www.youtube.com/watch?v=2baEa...4&feature=plcp

http://www.youtube.com/watch?v=A-xZx...FFBEC4&index=4

http://www.youtube.com/watch?v=0t2jh...FFBEC4&index=3

http://www.youtube.com/watch?v=oyfKS...FFBEC4&index=2

Link to youtube channel:

http://www.youtube.com/my_videos

Sixkillers · November 6, 2012, 02:04

Quote:

Link to youtube channel:
http://www.youtube.com/my_videos

I think the link might not be working

Far · November 6, 2012, 03:48

Quote:

Originally Posted by PSYMN

Available where?

The video for that particular case (with legs) is available in my PC

but it is too big for the YouTube (600 mb). I can share it through dropbox or may be I try to get the low quality video and then upload it on the YouTube.

PSYMN · November 6, 2012, 04:38

The Links worked for me.

Also, I see that ANSYS inc's Tech page has "liked" Far's videos, so they are visible from there as well.

http://www.youtube.com/user/ANSYSTechTips

Thanks Far for contributing over 6 hours of video!

cfd seeker · November 6, 2012, 11:58

Far has contributed so much to this forum, he deserves to be the ADMIN of the page really

PSYMN · November 6, 2012, 12:06

Quote:

Originally Posted by cfd seeker

Far has contributed so much to this forum, he deserves to be the ADMIN of the page really

Find him on Linked in and give him a recommendation that may pay off outside this forum...

I was about to provide a link, but that is not my place...

Instead, just do a google search for his email address and look for the linked in options... You will find his contact etc.

Anna Tian · February 2, 2014, 07:06

Quote:

Originally Posted by Far

Previously I showed the Ahmed's body mesh without legs. This time legs are also included. First o-grid is made around main body and then around two legs up to the road surface (bottom)

Your fourth grids figure shows very large grids expansion ratio (volume of change) near the pillar? It looks like it is above 10. Usually the criteria for expansion ratio is below 5 or 6. Any justification of using large expansion ratio? It also shows up in the other regions in your other pictures. You have fine mesh to model the BL. Then you have a very sudden size change with very large grids expansion ratio to the neighboring grids.

Far · February 2, 2014, 07:23

Quote:

Originally Posted by Anna Tian

Your fourth grids figure shows very large grids expansion ratio (volume of change) near the pillar? It looks like it is above 10. Usually the criteria for expansion ratio is below 5 or 6. Any justification of using large expansion ratio? It also shows up in the other regions in your other pictures. You have fine mesh to model the BL. Then you have a very sudden size change with very large grids expansion ratio to the neighboring grids.

That was a very quick mesh and not meant for simulation. The purpose only is to show the blocking strategy in ICEM CFD.

Anna Tian · February 2, 2014, 07:32

Quote:

Originally Posted by Far

That was a very quick mesh and not meant for simulation. The purpose only is to show the blocking strategy in ICEM CFD.

Ok. Thank you a lot for your posts on Ahmed body simulation. You show a good practice for the vehicle aerodynamics modeling. These information are very helpful to me.

We know that CFD could reach very good correspondence with experimental data for Ahmed body. I'm wondering is this good match kind of coincidence or we can say nowadays generally CFD with RANS model is already able to well model the blunt body drag like for other vehicle geometries?

Far · February 2, 2014, 07:49

Due to high power of computer speed and memory, we can now run fine meshes on routine which was previously only possible at big institute/laboratories. In addition to that solver algorithms and flow schemes are also improving at rapid rate. So now a days we can resolve the mean flow features within reasonable accuracy with RANS...

Anna Tian · February 5, 2014, 04:25

Hi,

I'm looking for Cl and Cd experimental data for Ahmed body. Could anyone kindly provide me that data? I looked for it online but didn't find it. I also asked this question in the main forum. But people tell me that they also don't have Cd or Cl data.

October 29, 2012, 13:42	Ahmed body Hexa mesh (with legs)	#1
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Previously I showed the Ahmed's body mesh without legs. This time legs are also included. First o-grid is made around main body and then around two legs up to the road surface (bottom) energy382, Sixkillers, nitinbansal184 and 2 others like this. Last edited by Far; October 29, 2012 at 14:11.

November 5, 2012, 14:11		#3
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	Available where? __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

November 5, 2012, 14:22		#4
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	Far's channel : http://www.youtube.com/user/turboeng.../videos?view=0 __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

November 5, 2012, 14:28		#5
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	I figured I would ask just to get the link up on this thread __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

November 6, 2012, 04:38		#9
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	The Links worked for me. Also, I see that ANSYS inc's Tech page has "liked" Far's videos, so they are visible from there as well. http://www.youtube.com/user/ANSYSTechTips Thanks Far for contributing over 6 hours of video! __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

October 29, 2012, 23:07		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Video clip (50 minutes and voice is also included) and other necessary files are also available.

November 6, 2012, 11:58		#10
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	Far has contributed so much to this forum, he deserves to be the ADMIN of the page really

February 2, 2014, 07:49		#15
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Due to high power of computer speed and memory, we can now run fine meshes on routine which was previously only possible at big institute/laboratories. In addition to that solver algorithms and flow schemes are also improving at rapid rate. So now a days we can resolve the mean flow features within reasonable accuracy with RANS...

February 5, 2014, 04:25	Looking for experimental data for Ahmed body	#16
Anna Tian Senior Member Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 15	Hi, I'm looking for Cl and Cd experimental data for Ahmed body. Could anyone kindly provide me that data? I looked for it online but didn't find it. I also asked this question in the main forum. But people tell me that they also don't have Cd or Cl data. __________________ Best regards, Meimei

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