# discrete phase modeling-coupled or uncoupled?

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 January 10, 2010, 21:53 discrete phase modeling-coupled or uncoupled? #1 New Member   Mrt Join Date: Mar 2009 Posts: 21 Rep Power: 8 Hello Everyone, I have 2D snowplow model to analyze the snow particles trajectories after rebound plow blade. There is going to be at least 30 cm snow in the ground and velocity will be 20 m/s for these snow particles (snowplow speed is 20 m/s). My question; 1) Which calculation method should I choose in DPM- uncoupled or coupled? 2) Which turbulence model is most available for my model- k-e or RSM? 3) Could we solve discrete phase at the same time with the continuous phase? Thanks, Murat wdridi likes this.

January 10, 2010, 22:10
Dpm
#2
Senior Member

CFDtoy
Join Date: Mar 2009
Location: United States
Posts: 145
Blog Entries: 2
Rep Power: 8
Hi there,

1. use DPM uncoupled - assumption: motion of snow particles does not influence air flow - dilute particles. Unless you have heavy particles (with high fraction) flowing in the continuous medium ....you can safely assume that snow follows the air movement.
2. for turbulence : RSM is effective..since the flow may contain recirculation behavior (this is more importantly based on your geometry) strain effects not well captured by k-e.
3. the dpm integrates partice motion with the continuous gas medium.

Hope this helps.

/CFDtoy
visit http://cfdtoy.blogspot.com

Quote:
 Originally Posted by MDinc Hello Everyone, I have 2D snowplow model to analyze the snow particles trajectories after rebound plow blade. There is going to be at least 30 cm snow in the ground and velocity will be 20 m/s for these snow particles (snowplow speed is 20 m/s). My question; 1) Which calculation method should I choose in DPM- uncoupled or coupled? 2) Which turbulence model is most available for my model- k-e or RSM? 3) Could we solve discrete phase at the same time with the continuous phase? Thanks, Murat

 January 25, 2010, 16:35 #3 New Member   Mrt Join Date: Mar 2009 Posts: 21 Rep Power: 8 Hi, Thank you for reply to my questions. 1. I was also thinking to apply ''uncoupled'' option for the DPM part. Your answer help me in this way. 2. Also, I will consider RSM Tur. modelling (especially for the 3D model)seeing that I have complicated and detailed snowplow truck geometry. 3. But, I still could not understand that if I should apply DPM modelling parameters (inert particles, densities, ....) after getting solution from the continuous phase or not? Thanks, Murat

March 22, 2011, 08:16
Snow Avalanche
#4
New Member

yashwant
Join Date: Apr 2010
Posts: 20
Rep Power: 7
hi
i am doing the snow avalanche problem so rt now i am using the snow as a fluid but as per the problem i have to model it as granular structure. so please suggest me how to model the snow in fluent to get the actual effect.
thanks

Quote:
 Originally Posted by MDinc Hello Everyone, I have 2D snowplow model to analyze the snow particles trajectories after rebound plow blade. There is going to be at least 30 cm snow in the ground and velocity will be 20 m/s for these snow particles (snowplow speed is 20 m/s). My question; 1) Which calculation method should I choose in DPM- uncoupled or coupled? 2) Which turbulence model is most available for my model- k-e or RSM? 3) Could we solve discrete phase at the same time with the continuous phase? Thanks, Murat

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