CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Coal combustion. Particles number at inlet.

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

LinkBack Thread Tools Search this Thread Display Modes
Old   November 16, 2008, 05:09
Default Coal combustion. Particles number at inlet.
Posts: n/a
Hi colleagues, the question is to specialists who have some experience in coal dust combustion. How many representative particles should I set at inlet BC? Is number of particles should be proportional to coal mass flow? Is the number has influence to results (temperature, species fractions, etc.). What number is more robust? CFX Help recommend using more particles to improve convergence. All in all… Big number o small? Pros and contras? What's your opinion? Thanks for responses!

  Reply With Quote

Old   November 16, 2008, 06:15
Default Re: Coal combustion. Particles number at inlet.
Posts: n/a

each Lagrangian particle represents a certain number of real particles. The larger the number you specify the more accurate the representation will be.

Also, the smaller the number of particles you specify the higher the mass loading for each particle; this can give give problems with convergence because the Lagrangian method generates sources which are introduced into the Eulerian phase.

So, in short, the more particles the better (although this will obviously incur a higher computational cost).

  Reply With Quote

Old   November 29, 2008, 08:33
Default Re: Coal combustion. Particles number at inlet.
Posts: n/a
I have a big question...

the inlet temperature of air stream, Can it, be environment temperature???
  Reply With Quote


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
trying to simulate two-phase jet flow with particles in surface injection ajkratos FLUENT 5 March 3, 2015 21:33
Particles affecting radiation in combustion chamber bharath CFX 0 September 23, 2011 21:41
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Meshing & Mesh Conversion 2 March 27, 2011 21:11
Modelling Coal Combustion like a fluid Dr. Flow Squad FLUENT 1 March 21, 2007 13:47
Coal combustion with Fluent 4.5 or 5.0! Sriram Popuri Main CFD Forum 2 July 24, 1999 11:34

All times are GMT -4. The time now is 07:30.