CFD Online Logo CFD Online URL
Home > Forums > FLUENT

3-D Water Flow in Fluent to Evaluate Pressures

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

Sponsored Links

LinkBack Thread Tools Display Modes
Old   September 1, 2009, 15:16
Default 3-D Water Flow in Fluent to Evaluate Pressures
New Member
Allen Hammack
Join Date: Sep 2009
Posts: 7
Rep Power: 9
ahammack is on a distinguished road
I am trying to simulate a water flow, and there are some problems with the pressures and velocity magnitudes. I have one inflow boundary and one outflow boundary. All other surfaces have wall boundary conditions with a specified shear stress of zero in all directions. I am trying to get my reference pressures correct. Therefore, I am running no flow through the model (by specifying zero velocity through my inflow boundary), and the pressures in the flow domain should be hydrostatic. When I look at my results, I am getting velocity magnitudes up to 5 m/s and pressure that are hydrostatic but do not have the correct magnitudes for the given z-location. What can I check to find out what is wrong with my solution? Does my boundary condition setup sound wrong? Any ideas why the velocity magnitudes are so far from the prescribed inflow velocities? Are there any solver options/tolerances I need to be sure to check?
ahammack is offline   Reply With Quote
Sponsored Links

Old   September 1, 2009, 19:37
Senior Member
Join Date: Jul 2009
Location: Ohio, USA
Posts: 169
Rep Power: 10
Chris D is on a distinguished road
Have you tried to change your "inflow" and "outflow" boundary conditions to "wall" so that you, essentially, have a tank filled with water (i.e., no flow)? Also, I think you need to turn gravity on if you want to solve a hydrostatic problem (it's off by default.)
Chris D is offline   Reply With Quote

Old   September 1, 2009, 22:41
Default 3-D Water Flow in Fluent to Evaluate Pressures
New Member
Allen Hammack
Join Date: Sep 2009
Posts: 7
Rep Power: 9
ahammack is on a distinguished road
Chris D,

Thanks for your reply! Yes, I have tried running a simulation with "wall" boundary conditions for all surfaces. I also have gravity turned on.

Another interesting thing I'm finding with my solution is that not only are the pressures not the hydrostatic values that I calculate analytically for the bottom of my flow domain (although I am getting a hydrostatic pressure distribution) the pressures are not constant for the same depths. This leads me to believe that the solver is not converging, but I can't seem to get any better solution behavior with the options I have changed so far.

Any suggestions?
ahammack is offline   Reply With Quote


3-d, fluent, pressure, water

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
3D-Simulation of Water Flow From Nozzle into Air Navin Sampath FLOW-3D 2 February 26, 2009 11:46
How to model suction flow in an airfoil in Fluent Davy FLUENT 4 October 23, 2006 03:56
Guage vs. Absolute pressures in Fluent. Riaan FLUENT 1 January 21, 2005 15:22
pressures in MDM - parallel fluent paolo FLUENT 1 April 7, 2004 00:38
How Fluent treat the pressure term in imcompressible flow Ray FLUENT 1 May 24, 2000 16:50

Sponsored Links

All times are GMT -4. The time now is 07:30.