CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Something about raindrops simulation by DPM

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

LinkBack Thread Tools Display Modes
Old   July 25, 2009, 05:23
Default Something about raindrops simulation by DPM
New Member
Join Date: May 2009
Posts: 8
Rep Power: 10
Byron is on a distinguished road
hi ,everybody.
I meet some troubles about raindrops simulation by DPM.
I want to simulate full-scale raindrops by DPM.I use the surface injection.

the computional domain is 3D and is very large,900*900*3000(height).
So, the number of raidrops in domain is very very large with exceeding 1E+12.

The bounded face was adopted as surface injection.

Now, if I want to simulate this project, the grid faces in bounded face (surface injection) were very very large numbers .And , it must exceeds the capitcy of the Computer .

Is any other way which I can choose to avaoid this problem?
Byron is offline   Reply With Quote

Old   July 25, 2009, 09:19
New Member
Join Date: Jun 2009
Posts: 24
Rep Power: 10
Geisel is on a distinguished road
As I suppose, you want to decrease the number of raindrops tracked by DPM analyse.

The number of tracked particles in surface injections depend of the number of cells used to create this surface... something like that
And there is no option to change the numbers.

There are two options...

You can use UDF (I have readen somewhere here about it, but never used it)

or you can use injections from file...
just create a file in notepad. Rename it to blabla.inj
And inside write some lines (you can use Excell to compute this) like:
(( x y z u v w diameter temperature mass-flow) name )
x,y,z - location
u,v,w - velocities
each in SI units

((0.01 0.03 -2.1 0 0 -4.5 0.00004 123 0.001) 1)
((0.02 0.05 -1.9 0 0 -4.5 0.00004 123 0.001) 2)
((0.121 0.123 -67.1 0 0 -4.5 0.00004 123 0.001) 1131)
Check User Guide for more information.

Hope it will be works.
Geisel is offline   Reply With Quote

Old   July 25, 2009, 21:01
New Member
Join Date: May 2009
Posts: 8
Rep Power: 10
Byron is on a distinguished road
Thanks for Geisel

your reply give me a lightpoint,especially the second option would fit my problem well.I will try it immediately.

Lastnight,I also thought another way that I will divide the full-scale computational domain into 12 parts by 30 degrees each part ,because the domain is axial symmetrical. I will carry out calculation only on one part.
Then ,the domain is redued and the total drops is also reduced spontaneously.
Byron is offline   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
Diesel Combustion with DPM simulation Kamil Sobczak FLUENT 2 March 29, 2016 04:58
Uregent: Fluent Error: DPM simulation, Segementation Error ahad_5 FLUENT 0 June 24, 2009 11:49
Solid Particle Simulation without DPM Nikhil Dani FLUENT 0 November 22, 2008 13:26
A parallel simulation problem in DPM satum FLUENT 0 October 21, 2008 05:38
problem about DPM of cyclone separator simulation jason FLUENT 4 November 12, 2007 04:15

All times are GMT -4. The time now is 21:12.