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

How to determine number of prism layers and total height

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 12, 2016, 16:15
Default How to determine number of prism layers and total height
  #1
New Member
 
Edward Kraft
Join Date: Dec 2014
Posts: 11
Rep Power: 11
ekraft is on a distinguished road
Like the title says, how do you know how many prism layers to use and total height of the prism layers? I was able to calculate my near wall length in order to get my y+ value to be less than 1 at the wall, but I'm not sure how to determine the total length. Attached are two images of my inlet face and a zoomed in picture of a prism layer transition. The cells of the last prism layer are much smaller than the first layer of tetras. Is that concerning? Thank you!
Attached Images
File Type: png Inlet.PNG (26.8 KB, 4 views)
File Type: png Prism Layer Zoom.PNG (4.8 KB, 5 views)
ekraft is offline   Reply With Quote

Old   July 13, 2016, 02:33
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,676
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
After you have satisfied your first cell height to achieve whatever y+ criteria you need, choose as small a growth ratio that you can afford.

Then, you want a smooth and gradual transition between cell sizes. So choose the number of layers and total thickness such that the last prism layer is ~ the same size as the first tet.
LuckyTran is offline   Reply With Quote

Reply

Tags
prism layers

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
Prism Layers not generated ms42 STAR-CCM+ 3 September 14, 2015 22:01
[ICEM] Cannot see Prism layers hasanifte ANSYS Meshing & Geometry 0 February 18, 2015 00:01
[ICEM] Element sizing question siw ANSYS Meshing & Geometry 4 January 22, 2015 09:11
Prism layers and grid dependence study jcamilleri STAR-CCM+ 4 July 7, 2014 13:47
Getting prism to inflate into mixed tet-hex meshes Joe CFX 16 October 10, 2011 07:06


All times are GMT -4. The time now is 17:19.