Brownian, DPM

nishantkakkar71 · March 8, 2021, 13:12

Hello everyone. I want to include Brownian motion effects for my particles. In the Ansys user guide (http://www.pmt.usp.br/academic/marto...rs%20Guide.pdf), it is mentioned that this can be done simply by enabling the "Brownian Motion" option under the "Physical Models" tab (Page 1181). However, I can't see any option named "Brownian Motion" in that tab. The options visible are as follows: Saffman Lift Force, Virtual Mass Force, Pressure Gradient Force, Erosion/Accretion, Two-way Turbulence Coupling, DEM Collision, Stochastic Collision, Breakup. I am attaching the image of the same for your reference. I request you to please let me know if there is some other option which I might be missing here. Thanks in advance. In anticipation of your response.

nishantkakkar71 · March 8, 2021, 13:36

UPDATE: I turned on the "Energy Equation" and now I can see the Brownian Motion dialog box after changing the drag law to "Stokes Cunningham" under the "Physical Models" tab in the "Set Injection Properties" panel. My main objective is to look at particle trapping over a surface (number of particles getting trapped). Can someone please clarify if turning on that "energy equation" affects the number of particles getting trapped over the surface in any manner, other than whatever effect Brownian Motion would be having? Also, I need to enter the "Cunningham Correction" value before proceeding. How can I calculate this value? I would be highly grateful for any help. Thanks in advance.

March 8, 2021, 13:12	Brownian, DPM	#1
nishantkakkar71 New Member Nishant Kakkar Join Date: Dec 2020 Posts: 9 Rep Power: 5	Hello everyone. I want to include Brownian motion effects for my particles. In the Ansys user guide (http://www.pmt.usp.br/academic/marto...rs%20Guide.pdf), it is mentioned that this can be done simply by enabling the "Brownian Motion" option under the "Physical Models" tab (Page 1181). However, I can't see any option named "Brownian Motion" in that tab. The options visible are as follows: Saffman Lift Force, Virtual Mass Force, Pressure Gradient Force, Erosion/Accretion, Two-way Turbulence Coupling, DEM Collision, Stochastic Collision, Breakup. I am attaching the image of the same for your reference. I request you to please let me know if there is some other option which I might be missing here. Thanks in advance. In anticipation of your response.

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March 8, 2021, 13:36		#2
nishantkakkar71 New Member Nishant Kakkar Join Date: Dec 2020 Posts: 9 Rep Power: 5	UPDATE: I turned on the "Energy Equation" and now I can see the Brownian Motion dialog box after changing the drag law to "Stokes Cunningham" under the "Physical Models" tab in the "Set Injection Properties" panel. My main objective is to look at particle trapping over a surface (number of particles getting trapped). Can someone please clarify if turning on that "energy equation" affects the number of particles getting trapped over the surface in any manner, other than whatever effect Brownian Motion would be having? Also, I need to enter the "Cunningham Correction" value before proceeding. How can I calculate this value? I would be highly grateful for any help. Thanks in advance.