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August 10, 2012, 02:57 
Dense discrete phase model

#1 
New Member
Theerawat
Join Date: Jul 2012
Posts: 22
Rep Power: 5 
Hi, I want to know how can I use dense discrete phase model in Eurlerian model
what is the transition factor, If I wanna specify volume fraction, what should I do? Thank you very much 

August 10, 2012, 09:45 

#2 
Senior Member

Hi,
Using a scalar transport equation (UDS) is a good alternative in Eulerian modelling but it makes sense if the particle diameters are in nano range. Bests,
__________________
Amir 

April 28, 2014, 06:01 

#3 
New Member
lucas s
Join Date: Jul 2013
Location: Grenoble, France
Posts: 7
Rep Power: 4 
Hello everyone,
I would like to reasked the questions of Theerawat, because I think his questions are relevant. After reading the ansys doc, my ideas aren't clear at all. What is the difference between Dense DPM and DPM? Then, what is the transition factor used for? Ansys Doc: "Enable Volume Fraction Approaching Continuous Flow Limit to specify a Transition Factor. The Transition Factor is multiplied by the theoretical closepacking limit for monosized spheres (PI/(3* = 3/4) to determine the transition volume fraction. The default value for the Transition Factor is 0.75, giving a transition volume fraction of 0.5625 (PI/(3* = 3/4)." What is "the theoretical closepacking limit for monosized spheres" and what is transition volume fraction? I know it's a lot of questions but it will be very useful if someone could bring his knowledge. Thanks you very much, 

December 5, 2014, 04:32 

#4 
New Member
Georgy
Join Date: Apr 2011
Location: Russia
Posts: 19
Rep Power: 6 
Hello!
Does anybody know where it is possible to find any tutorial on DPM, DEM and/or Dense DPM models? Thank you! 

April 15, 2015, 12:44 

#5 
New Member
Victor Liblin
Join Date: Apr 2015
Location: Switzerland
Posts: 1
Rep Power: 0 
Quote:
PI/(3*sqrt(2)) is obtained by trying to dertermine this value. To understand the factors, considers this example : if you fill a pipe with monosized particles up to its half, then finish to fill it up with water, the transition factor is 0.5 BUT in fact you had to put in more than 0.5*V of water right ? The transition volume fraction (which is the actual fraction of the volume taken by the spheres) is then 0.5*PI/(3*sqrt(2)). Hope this answers you question. Best regards, Victor 

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