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

Free surface of Step with VOF

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 12, 2004, 13:43
Default Free surface of Step with VOF
  #1
Azin Sharafeddin
Guest
 
Posts: n/a
My question is:

I want to find free surface profile of a flow over a step with VOF method. How should I define my boundary conditions? Which part are phjase-1 & which phase-2 & mixture too. How should I mesh it in Gambit?

If it was in a under pressure condition I could do it, but with free surface I can't! Thanks for your help!

  Reply With Quote

Old   May 26, 2004, 06:24
Default Re: Free surface of Step with VOF
  #2
akbar safarzadeh
Guest
 
Posts: n/a
Dear my friend

I'm working with vof model of fluent for 2 phase problems in hydraulic engineering.

if you want to find the free surface over a step, do this steps:

1- in the gambit, define all the domain as a single blocK (there is no need to separete the air and water parts). 2- set the pressure outlet boundary condition for the top of your domain B.C. 3- in the fluent define the water from material option. 4- go to define-> modules-> multiphase-vof. 5- if you are working with version 6. go to define->phases. and set the water as the material of phase 2. 6- adapt a region that covers the inlet depth. (go to: adapt->region-> enter the min and max cordinates of the part that at t=0 sec you want to be filled with water (vof=1)). 7- go to : grid-separate-face---- mark. then separate the inlet of your domain with the adapted region to 2 parts. one of these parts is the constant depth of water at the inlet and the other is the part that it's vof eqales 0 (air part). (the new boundary named inlet:019 (for example) is the water part.) 8- in B.C option set the velocity inlet for water part and for the air part give a small velocity compared with water vel. click on the new boundary and at the bottum set phase 2 and set vof=1 for this B.C. 9- go to initalize and initalize all zonez. 10- patch the vof=1 for adapted domain. 11- go to iterate and set dt=0.01 and then run the program.

I hope this helps you. if you have another question please write to me.

best wishes A. Safarzadeh

  Reply With Quote

Reply

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
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 16:33
Numerical schemes for free surface flows (VOF) botp OpenFOAM 2 March 11, 2011 16:27
time step in free surface problems KtoTo Siemens 4 June 26, 2007 08:03
VOF simulation free surface caused by gas inject rensb FLUENT 4 July 20, 2006 05:45
VOF free surface tracking LK FLUENT 2 May 20, 2006 13:20


All times are GMT -4. The time now is 18:10.