CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Phoenics

Wind profile

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

LinkBack Thread Tools Search this Thread Display Modes
Old   September 21, 2005, 08:10
Default Wind profile
Posts: n/a
Hi all,

I am using the wind profile in v3.6.1 It works fine! However there is a slight problem in that the profile changes slightly as it moves through the domain (problem with all codes). Now the change isn't a whole lot and i'm being very pedantic about this but i would really like the flow to remain stable.

In the CFX forum a person suggested that: "Maintaining a constant profile can be tricky and a constant problem. Some codes allow a feedback mechanism to perpetuate the flow through the model. What happends is that you specify an inlet condition - your profile, and then at the out let you feed back the outlet flow profile back into the inlet. This constant loop ensures that the result reaches a stable profile for a given inlet condition. This can then be input into the final model for a gived roughness and there should be no change in profile conditions throughout the model."

Can I do this with Phoenics?

Thanks for any help!

  Reply With Quote

Old   September 21, 2005, 12:28
Default Re: Wind profile
Posts: n/a
It seems to me that if the boundary conditons are set up correctly, and the internal numerics are consistent, then the inlet boundary-layer profile should be replicated throughout the solution domain. Library Case T306 does a fairly good job of preserving the velocity profile from inlet to outlet in the y-z solution plane.
  Reply With Quote

Old   September 28, 2005, 10:51
Default Re: Wind profile
Posts: n/a
Yes, this sounds like an xcycle type principal. If you have a compilable version you could this up within the file ground.for group 13 and from the Q1 use a user_defined inlet condition. However to my knowledge it is not set up as a standard front end click on thing in PHOENICS.

  Reply With Quote


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
log law for wind velocity profile Tom P Main CFD Forum 17 February 13, 2016 15:30
Wind profile Anders Main CFD Forum 1 August 26, 2005 09:07
create logarithmic wind profile for inlet Murat Main CFD Forum 0 December 30, 2003 00:45
Atmospheric Wind Profile - Inlet Subroutine Roger Siemens 3 December 12, 2002 10:00
Wind profile in CFX5.5 Peter CFX 1 April 9, 2002 11:39

All times are GMT -4. The time now is 04:16.