CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

I am surprised by a CFD program

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 15, 2008, 17:24
Default I am surprised by a CFD program
  #1
Jimmy
Guest
 
Posts: n/a
It takes within a minute only for a cfd program to complete the plenum simulation of a data center. How can it be so fast?
  Reply With Quote

Old   August 15, 2008, 18:28
Default Re: I am surprised by a CFD program
  #2
Robin
Guest
 
Posts: n/a
What was the cfd program called?
  Reply With Quote

Old   August 15, 2008, 18:48
Default Tileflow
  #3
Jimmy
Guest
 
Posts: n/a
do u think it can have a converged result in one minute? or does this program really do a decent mesh?
  Reply With Quote

Old   August 15, 2008, 23:24
Default Re: I am surprised by a CFD program
  #4
Ahmed
Guest
 
Posts: n/a
That should not surprise you, solving air problems at the conditions described by you does not require the solution of the compressible Navier Stokes equations, just the incompressible ones, and if you add to that a Cartesian mesh generator then the mystery is out. You need to compare apples with apples, have you tried to solve the same problems using AirPak, just to mention one competing programme
  Reply With Quote

Old   August 16, 2008, 00:29
Default Re: I am surprised by a CFD program
  #5
Humm
Guest
 
Posts: n/a
and here i am spending hours for solving incompressible flow problems using fluent. Silly me.
  Reply With Quote

Old   August 17, 2008, 00:17
Default one more question
  #6
Jimmy
Guest
 
Posts: n/a
are there any options like setting the problem as compressible or incompressible in the commercial CFD codes?
  Reply With Quote

Old   August 19, 2008, 20:40
Default Re: one more question
  #7
Ahmed
Guest
 
Posts: n/a
When I read your first posting, the impression I got is that you are a new sales engineer trying to call the attention of this forum's readers to your product ( do not worry about that, others try to do the same), but when I read your last posting and the one that precedes it, I realize that you have an utterly serious defficiency in your academic preparation (sorry to say that on a public forum) The difference between compressible and incompressible flows is very well explained in all texts and references about fluid mechanics. Once you know the difference, you will find out that all codes provide mechanisms for all flow situations. As you see, implementing the condition for constant density is straightforward, so check the documents of your particular code or give your support engineer a phone call.
  Reply With Quote

Old   August 19, 2008, 22:40
Default Re: one more question
  #8
nose poker
Guest
 
Posts: n/a
I realize that you have an utterly serious defficiency in your academic preparation (sorry to say that on a public forum) The difference between compressible and incompressible flows is very well explained in all texts and references about fluid mechanics.

I am sorry to poke my nose in here but it seems that the only person who has deficiency in academics is you.

Could you point me to any article that says that if the flow is incompressible and if one is using Cartesian grid, flow problem could be solved in a minute, no matter how large the size of problem.

Even if navier stokes is written in incompressible form (which makes it harder to solve by the way), you can not write analytical solution to it. So the way to solve is to use iterative solution. This is why Fluent, starCCM+, CFX take hours to converge to some solution. If you have magic formula than you could make millions. Go ahead.

And yes, do not insult people if you do not understand question. It kinda shows your intelligence (or lack of it).

So you have anything useful to add, then please write.

  Reply With Quote

Old   August 19, 2008, 23:15
Default Re: I am surprised by a CFD program
  #9
nose poker
Guest
 
Posts: n/a
Jimmy by looking at one of the papers in technical paper section downloads. It seems they are using some formula to approaximate pressure drop. So the flow domain is devided into tiles or cartesian block. Then based on air flow coming into it, they calculate the pressure drop (by some formula) then move to next tile and so on. This way by the time they finished all the tiles, they have flow distribution and pressure drops. Giving you velocity and pressure distribution.

(this is what i gathered from my 5 minutes look at tileflow's site). _May be more to it, but i do not have much time to look at it now.

  Reply With Quote

Old   August 20, 2008, 11:57
Default Thanks much for your comments *NM*
  #10
Jimmy
Guest
 
Posts: n/a
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Simulation Program for CFD Jon Inouye Main CFD Forum 5 October 10, 2003 13:23
Where do we go from here? CFD in 2001 John C. Chien Main CFD Forum 36 January 24, 2001 22:10
CFD JOBS and Expected Salary.... Noel Harrison Main CFD Forum 11 November 22, 2000 08:15
CFD Salary CFD Main CFD Forum 15 September 4, 1999 14:04
public CFD Code development Heinz Wilkening Main CFD Forum 38 March 5, 1999 12:44


All times are GMT -4. The time now is 08:20.