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

Inlet and Outlet conditions for a nozzle

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 23, 2018, 11:56
Default Inlet and Outlet conditions for a nozzle
  #1
New Member
 
Karnataka
Join Date: Feb 2018
Posts: 2
Rep Power: 0
shastry123 is on a distinguished road
I chose velocity inlet condition(inlet velocity being 13.95 m/sec) for subsonic incompressible flow through a nozzle, and outflow condition at the outlet but the solution gives me a very high value(3e5 pascal) at the inlet and a very low value at the outlet (-23000 pascal). Can u suggest me any changes that I have to make to this?
shastry123 is offline   Reply With Quote

Old   February 28, 2018, 19:23
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,758
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
If your setup is incompressible then there is no meaning to subsonic. So is your working fluid compressible or no?

Check your mass-flow rate. Try a pressure outlet. Do your velocities make sense so far? What types of values are you expecting for the pressure difference? Maybe you have completely messed up a BC somewhere.
LuckyTran is online now   Reply With Quote

Old   March 1, 2018, 01:04
Default Need help with the boundary conditions
  #3
New Member
 
Karnataka
Join Date: Feb 2018
Posts: 2
Rep Power: 0
shastry123 is on a distinguished road
The fluid is incompressible, it is liquefied wax. The velocity of it should be less than 6m/sec.

[URL="https://drive.google.com/open?id=1wO2K0VXAwBIB7mfvBsvr3eQtPzZ1D_uq"]
I am posting the url(only which is inside the quotations) of the image.

I have named the inlet, outlet for the nozzle as shown in the image file. The plate is subjected to transient force because of which the liquid that is entering through the inlet is forced to the outlet. This is my idea which I want to simulate.

The outlet is exposed to the atmosphere. As I want the liquid to come out of the nozzle, the pressure at outlet should be slightly higher than that of the atmospheric pressure.
shastry123 is offline   Reply With Quote

Reply

Tags
high pressure at inlet, inlet, low pressures at outlet, nozzle, outlet

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
Wrong flow in ratating domain problem Sanyo CFX 17 August 15, 2015 07:20
Boundary conditions for flow in nozzle kgevers FLUENT 0 July 26, 2015 13:46
Setting both inlet and outlet with pressure boundary conditions ahmadbakri CFX 0 July 1, 2015 05:06
inlet and outlet for convergent nozzle josh99 FLUENT 1 December 25, 2011 14:24
Inlet and Outlet Boundary conditions for LES Jan Ramboer Main CFD Forum 12 August 6, 1999 23:00


All times are GMT -4. The time now is 12:31.