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

[ICEM] Edge bunshing law and growth rate

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 23, 2016, 11:39
Default Edge bunshing law and growth rate
  #1
New Member
 
Johannes Hall
Join Date: Sep 2016
Posts: 21
Rep Power: 9
yonpanman is on a distinguished road
Hello everyone,

I am trying to set a specific growth rate for a boundary layer. I want a growth rate of 1.1 with the exponential function. The first layer is 6.2e-6 and I want to set the last layer to 0.1. I am using the biexponential option. When I add more nodes the only thing that differs is the growth ratio that is free so that seems to be all good. On to the questions!

It says that for the biexponential option the growth rate is changing at the midpoint at the edge. My first question is if this the physical midpoint or when half of the nodes are reached?

Secondly, when I add more nodes the distance between nodes is changing over the whole edge, but not the growth ratio that is set to 1.1. I'm struggling to understand how the growth ratio can be constant when the distances changes but i have my suspicions. It seems that the distance of the first and second layer is constant. In that case the growth ratio isn't necessarily constant until the midpoint of the edge. But this would kind of take away the whole thing with the the growing rate function.

The reason I am asking this is if I can be sure that I have enough nodes (like half the edge) with a growth ratio of 1.1. Anyone has an idea of the details of how this works?

Thanks and best regards!
Attached Images
File Type: png 30 close up.png (101.9 KB, 11 views)
File Type: png 40 close up.png (101.9 KB, 8 views)
File Type: png 30.png (114.6 KB, 6 views)
File Type: png 40.png (114.6 KB, 8 views)
yonpanman is offline   Reply With Quote

Old   October 25, 2016, 04:02
Default
  #2
New Member
 
Johannes Hall
Join Date: Sep 2016
Posts: 21
Rep Power: 9
yonpanman is on a distinguished road
No one????
yonpanman is offline   Reply With Quote

Old   October 27, 2016, 12:44
Default
  #3
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,553
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
just think what is happening in reality. it will respect the first cell height, no of nodes and also it will have one cell at the second end of geometry. ratio and height of cell at second end will change accordingly
Far is offline   Reply With Quote

Reply

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
UDF growth rate, unsteady state roca Fluent UDF and Scheme Programming 2 May 18, 2011 23:33


All times are GMT -4. The time now is 18:01.