|August 10, 2012, 02:57||
Dense discrete phase model
Join Date: Jul 2012
Posts: 22Rep 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||
Join Date: May 2009
Location: Montreal, QC
Blog Entries: 1Rep Power: 14
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.
|April 28, 2014, 06:01||
Join Date: Jul 2013
Location: Grenoble, France
Posts: 7Rep Power: 4
I would like to re-asked 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?
"Enable Volume Fraction Approaching Continuous Flow Limit to specify a Transition Factor. The Transition Factor is multiplied by the theoretical close-packing limit for mono-sized 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 close-packing limit for mono-sized 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||
Join Date: Apr 2011
Posts: 19Rep Power: 6
Does anybody know where it is possible to find any tutorial on DPM, DEM and/or Dense DPM models?
|April 15, 2015, 12:44||
Join Date: Apr 2015
Posts: 1Rep Power: 0
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 mono-sized 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.
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