CFD Online URL
[Sponsors]
Home > Forums > FLUENT

Pressure loss prediction

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 12, 2007, 09:04
Default Pressure loss prediction
  #1
Arata Ivan
Guest
 
Posts: n/a
Hallo..

I have a case of pressure loss prediction of a control valve (3d problem).

4 boundary areas: -Inlet section (condition: pressure inlet) -Outlet section (condition: ????) -Pipe wall (condition: wall) -Valve disc wall (condition: wall)

My input are: -Geometry -Inlet flow data (p,T,W..)

I want to obtain the valve outlet pressure using K-Epsilon.

What's the best way for you? What conditition can I set (best way) for the outlet section?

Thanks a lot...
  Reply With Quote

Old   June 12, 2007, 16:02
Default Re: Pressure loss prediction
  #2
AJ
Guest
 
Posts: n/a
See if this demo helps you.. although this is in CFX but could help you...

http://www-harwell.ansys.com/demoroo...ls.php?id=8,31

In your case you could use:

Inlet velcity BC Outlet pressure BC (0 value)

Pressure drop will be pressure developed at inlet.

Thanks, AJ
  Reply With Quote

Old   June 13, 2007, 10:41
Default Re: Pressure loss prediction
  #3
Arata Ivan
Guest
 
Posts: n/a
Well,

The "inverse" medology (inlet velocity-outlet pressure) is very nice, I will try it now for the CV prediction....

The CFX demo is nice too, but I think it's very simple because the input data are the inlet total pressure and the outlet staic pressure:

INLET: Total pressure = 12psi OUTLET: Average static pressure (0Pa)

Thank you Kind Regards Ivan
  Reply With Quote

Old   June 14, 2007, 11:55
Default Re: Pressure loss prediction
  #4
Arata Ivan
Guest
 
Posts: n/a
Ok,

case with inlet velocity and outlet pressure: I tried a inviscid test and the results are great!

Of course, I can't evaluate the pressure drop by inviscid calculation bat I think the guideline is ok.

Now I have K-Epsilon convergence problems, but i hope it's a grid problem.....

We'll see...

Thank you
  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
UDF to define or adjust pressure??? engahmed FLUENT 0 July 6, 2010 18:19
Pressure loss due to sudden expansion in pipe flow Ahmed FLUENT 0 January 2, 2006 11:01
using pressure varaition data for noise prediction Deosharan Roy CFX 2 July 13, 2005 02:30
pressure loss Babu FLUENT 1 March 21, 2005 12:05
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 23:02


All times are GMT -4. The time now is 14:48.