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

How to input transient pressure data as BC in pre?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 3, 2006, 03:38
Default How to input transient pressure data as BC in pre?
  #1
User
Guest
 
Posts: n/a
Hi.. I have two column of experimental data: time t & transient static pressure P(t) stored in a csv file. I wish to use P(t) as my outlet boundary condition in transient simulation.

However, I failed to initialise these data in Pre V.10.

I get an error message when I use "initialise profile data":

Invalid format .... ....unrecognised heading ....expected to read.... [spatial fields] section headings

Can anyone give me some ideas how to input the transient pressure data to Pre so that I can specify P(t) at the outlet BC.

Thank you for your help.

  Reply With Quote

Old   February 3, 2006, 07:42
Default Re: How to input transient pressure data as BC in
  #2
Camilo Costa
Guest
 
Posts: n/a
Exist in CFX help one tutorial that explain this, but i fogive was that!!

forgive my bad english!
  Reply With Quote

Old   February 3, 2006, 10:00
Default Re: How to input transient pressure data as BC in
  #3
User
Guest
 
Posts: n/a
Hi Camilo,

I found 5 (CFX 10) tutorials that talk about transient simulation.

Tutorial 4:Flow from a circular vent

Tutorial 6:Buoyant Flow in a partitioned cavity

Tutorial 12:Flow in an axial rotor/stator

Tutorial 17:Air Conditioning simulation

Tutorial 20:Fluid Structure Interaction and Mesh deformation

Tutorial 4 use formula ExpFunction to express transient term and do not use data imported from a text/csv file.

Tutorial 6 seems to use a fixed value for BC.

can't find any relavant info in Tutorial 12 as well.

Tutorial 17 uses the user subroutines ect but I can't find any methods to input t & P(t) from a csv file and use them for boundary condition.

I can't find any relavant info in Tutorial 20 either.

Did I miss out anything in tutorial? Would you mind to tell me which tutorial has the information I need? I have already spend hours to hunt for it.

Thank you very much.
  Reply With Quote

Old   February 3, 2006, 12:33
Default Re: How to input transient pressure data as BC in
  #4
Camilo Costa
Guest
 
Posts: n/a
I will sugest this!!

go in expressions anda set this example:

"2*sin((t/1[s]))[Pa] + 415[Pa]" ---> (CALL THIS VP)

clic in plot and define of 0 at 10s.

The pressure varable with time.

Go to bonduary condition that have inlet or outlet and clic in "Enter Expression" and put the name "VP"

forgive my bad english
  Reply With Quote

Old   February 6, 2006, 02:15
Default Re: How to input transient pressure data as BC in
  #5
Chirag Jayswal
Guest
 
Posts: n/a
Check following thread replying to similar query.

http://www.cfd-online.com/Forum/cfx_...cgi?read=12825

Hope this helps.

Kind regards,

Chirag
  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
Transient simulation (Problem with massflow and Pressure) ChristianF CFX 4 August 22, 2011 21:42
how to give pressure as an input in spray modeling satish CD-adapco 3 March 7, 2008 21:33
how to handel transient data with less file space steven CFX 2 October 27, 2006 17:01
How to update polyPatchbs localPoints liu OpenFOAM Running, Solving & CFD 6 December 30, 2005 18:27
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 16:00


All times are GMT -4. The time now is 13:07.