CFD Online Logo CFD Online URL
Home > Forums > CFX

Initial conditions for dam break...

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

LinkBack Thread Tools Display Modes
Old   April 22, 2002, 09:00
Default Initial conditions for dam break...
Gustaf Mårtensson
Posts: n/a
I'm attempting to model a simple dam break in CFX 5.5. I had hoped that I could set the initial condition of a step of water in my rectangular domain by defining a sub-domain and setting a specific volume fraction there and another in the rest of the domain.

According to the manual, this is possible, but I have failed to do so. I can only set initial conditions for the domain, not the sub-domain. Any ideas what I'm doing wrong?


Gustaf Mårtensson KTH, Sweden
  Reply With Quote

Old   April 22, 2002, 18:46
Default Re: Initial conditions for dam break...
Posts: n/a
Hi Gustaf,

The CEL function called [i]subdomain[i] will evaluate to 1 when you are in a subdomain and zero when you are not. If you want all the water within your subdomain and air elsewhere, just set the volume fraction of water to "subdomain" and that of air to "1-subdomain".

Similarly, you could use a step function or a combination of step functions.

Remember that you must also initialize the hydrostatic pressure (relative to your reference hydrostatic pressure which is calculated with the reference density you provided in the domains form when specifying gravity.)

Regards, Robin
  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
Multiple floating objects CKH OpenFOAM Running, Solving & CFD 12 March 21, 2016 14:05
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
ForcesCoeffs ronaldo OpenFOAM 4 September 14, 2009 07:11
Computational time sunnysun OpenFOAM Running, Solving & CFD 5 March 16, 2009 04:32
MRFSimpleFoam amp cyclic patches david OpenFOAM Running, Solving & CFD 36 October 21, 2008 21:55

All times are GMT -4. The time now is 17:22.