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

Converging-Diverging part

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 31, 2000, 20:18
Default Converging-Diverging part
  #1
Jungyoon hahm
Guest
 
Posts: n/a
Hi all, I try to analsys fluid film between flat plate and concave plate(so it has converging and diverging part) But the result says diverging part have negative pressure. It's somewhat stange to me I want to change this to seperation or other pressure value. How can I do?

Thanks, all

  Reply With Quote

Old   November 1, 2000, 11:01
Default Re: Converging-Diverging part
  #2
Phil
Guest
 
Posts: n/a
I don't know if I understand your question but negative pressures are relativ to the operation pressure.

If this is not your problem please explain more detailed you geometry, the system (incompressible fluid properties, lam or turb. case etc.).

Regards Phil
  Reply With Quote

Old   November 1, 2000, 13:31
Default Re: Converging-Diverging part
  #3
Jungyoon hahm
Guest
 
Posts: n/a
Thanks for your message. My system is fluid film formation between plate. It's incompressible and laminar flow. There is inlet and outlet.(have different pressure) The lower plate is flat as many simple problem. But the upper plate has geometry like parablic and it's center is located above the upper plate(so that is concave and has converging diverging part consecutively). There is pressure to support this fluid film. Due to this goemetry have converging and diverging part consecutively, there is negative pressure at the diverging part. So I want to find analysis method. One of this may be considering the seperation of the fluid film. Then how can I change the pressure value into the fluent?(I want to constrain the pressure will be same as separation condition)

  Reply With Quote

Old   November 17, 2000, 12:04
Default Re: Converging-Diverging part
  #4
Max
Guest
 
Posts: n/a
Phil, is that all turbulent flow is unsteady state?

Max
  Reply With Quote

Old   December 15, 2000, 09:19
Default Re: Converging-Diverging part
  #5
Phil
Guest
 
Posts: n/a
I do not understand what you are asking for?? So if you mean that turbulent flow is unsteady you are basicly right. This is caused by fluctuating values for each mean flow property. However you can simulate it assuming a steady state. Even if this is not right you get a result which is, if converged, a result of an unsteady flow.

Regards Phil
  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
Converging Diverging Nozzle in OpenFOAM danishdude OpenFOAM Running, Solving & CFD 1 September 15, 2012 00:12
[ICEM] How to mesh part by part? rikio ANSYS Meshing & Geometry 6 February 24, 2010 20:19
How to output data from stationary part only? Aerolex FLUENT 0 November 16, 2009 23:46
Any other way of converting a multi part to a single part avoiding ANSYS Design Model LusoMundo ANSYS Meshing & Geometry 1 May 14, 2009 14:35
Converging then Diverging Residuals??? Erika Johnson FLUENT 8 September 19, 2006 10:45


All times are GMT -4. The time now is 18:35.