CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

[Broken-dam prob. (SIMPLE, VOF)]

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

LinkBack Thread Tools Display Modes
Old   May 21, 2001, 04:27
Default [Broken-dam prob. (SIMPLE, VOF)]
Posts: n/a
Hi. I have two questions about broken-dam problem. I use SIMPLE method with VOF.

i) in inner iteration, can I solve algebraic eq. with SIP solver ? (need any other better solver ?)

ii) How can I give proper initial condition ? (especially in pressure)

  Reply With Quote

Old   May 22, 2001, 03:38
Default Re: [Broken-dam prob. (SIMPLE, VOF)]
Posts: n/a
Regarding initial Pressures

If your code is implemented correctly, you may initialise the pressures with zeros.

As you are solving for unsteady flow you have to iterate each time step (inner loops) over the Simple loop till convergence. For the broken dam problem the initial velocities are zero. Thus the first momentum prediction consists of the gravity source term as the pressure gradients are zero. The first Simple calculation will now produce the Pressure field that is consistent with the gravity sources of the momentum prediction.
  Reply With Quote

Old   May 22, 2001, 18:17
Default Re: [Broken-dam prob. (SIMPLE, VOF)]
Posts: n/a
1) I find the SIP solver solves these types of problems

but takes a few iterations to do so...

2) The Simple scheme takes in an initial guessed

and uses the pressure correction equation to

correct it... giving a better initial condition

will only improve your convergence...maybe you

mean boundary conditions???
  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
SIMPLE algorithm in 3D cylindrical coordinates zouchu Main CFD Forum 1 January 20, 2014 18:02

All times are GMT -4. The time now is 15:05.