CFD Online Logo CFD Online URL
Home > Forums > CFX

tutorial 7

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

LinkBack Thread Tools Display Modes
Old   May 7, 2008, 14:35
Default tutorial 7
Posts: n/a
Hi everyone!

What do, the function step, in the expressions of tuturial 7(free surface flow over a bump).


thanks a lot
  Reply With Quote

Old   May 13, 2008, 10:44
Default Re: tutorial 7
Posts: n/a
The initial conditions for the pressure field and volume fractionmust be consistent (i.e., the pressure field is hydrostatic in the heavy phase and uniform in light phase). This is easily done using CEL step functions. For example, the functions:

h = 2[m] initialVOFAir = stepz " h⁄ 1[m] initialVOFWater = 1 " initialVOFAir initialP = 998[kg m^-3]*g*h"z*initialVOFWater

would be appropriate to initialize the relative pressure field and volume fractions as shown below. In the equation for initialVOFAir, the division is required since the step function must operate on dimensionless quantities.

i hope it helps. I got this from the pdf manual topic MODELING ADVICE FREE SURFACE FLOW page 200 see the diagram at this page and let me know what you understand coz i am trying to digest this as well. mab
  Reply With Quote

Old   May 19, 2008, 11:39
Default Re: tutorial 7
Posts: n/a
Step(x) is 0 for negative x ,

is 1 for positive x ,

and 0.5 for x=0 . where x must be dimensionless.
  Reply With Quote


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
Tutorial for subcooled nucleate boiling Asghari FLUENT 41 December 20, 2017 17:16
[ANSYS Meshing] I need tutorial files colorful ANSYS Meshing & Geometry 5 September 19, 2014 01:21
Problem on Fluent Tutorial: Horizontal Film Boilig Feng FLUENT 2 April 13, 2013 05:34
STAR-CD Tutorial shekhar aryal STAR-CD 4 March 22, 2010 04:25
Rotor/stator tutorial, and how to... gilberto CFX 5 January 21, 2002 10:41

All times are GMT -4. The time now is 02:31.