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

CFdesign accuracy...

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 14, 2005, 11:22
Default CFdesign accuracy...
  #1
PAD
Guest
 
Posts: n/a
Hi,

Has anyone had any experience with a software package called CFdesign v7.0?

I'm trying to run simulations on small water coolers but see a lot of inaccuracies in the simulations with regards to the temperature increase of the water. Even though the solution is regarded as converged the energy balance simply does not compute correctly, i.e. the water temperature increase is too high compared to the heat going into the water.

Just wanted to know if I was the only one having trouble with the software package - seems to have a lot of bugs in it.

Regards, PAD
  Reply With Quote

Old   February 15, 2005, 06:11
Default Re: CFdesign accuracy...
  #2
A.S.
Guest
 
Posts: n/a
Hi

My advice is based on general experience

Which turbulence model you are using. K-epsilon and k-omega gives different result. Also the grid size will also matter. Please read your manual and give make grid adapt or remesh the grid to get y+. Typically for two layer k-epsilon turbulence model the value for wall y+ is < 1. Hope it would help.

A.S.
  Reply With Quote

Old   February 15, 2005, 07:06
Default Re: CFdesign accuracy...
  #3
PAD
Guest
 
Posts: n/a
Thanks for the reply.

I'm actually running the simulation as laminar - if convergence is achieved shouldn't the energy balance be OK no matter if the solution actually represents the real flow?

/PAD
  Reply With Quote

Old   February 15, 2005, 10:01
Default Re: CFdesign accuracy...
  #4
A.S.
Guest
 
Posts: n/a
Yes, It should be
  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
Pros and Cons for CFX, CFdesign, COMSOL Val Main CFD Forum 3 June 10, 2011 03:20
CFDesign V10 and Solidworks 2010 sonodelirii Autodesk Simulation CFD 1 August 25, 2010 21:11
CFdesign problems gaussist Autodesk Simulation CFD 3 July 8, 2009 11:41
Temporal accuracy ganesh Main CFD Forum 0 February 29, 2008 06:32
accuracy of Discontinuous Galerkin Qu Kun Main CFD Forum 0 September 6, 2004 10:19


All times are GMT -4. The time now is 13:09.