Particle Tracking (DPM Model)

kaveh0a · January 11, 2017, 10:48

Hi guys
I am trying to simulate a particle tracking project in a 90 bend with DPM model in fluent 14. the viscous model is RSM-EWT. In DMP model i set the " Max number of steps" to 5000 and " step length factor" to 5. there is no interaction between particle-particle and particle-continuous phase. I have used Rungt-kutta method for "tracking scheme".
I also created an injection with this following option:
injection type: surface-inlet
particle type: inert
inject using face normal direction:
d=4.7e-06 m
v=18 m/s
flow rate=1.2e-09 kg/s
this is equal to 25000 particle.
in every run that i have performed just 336 particle were tracked.
I have changed the flow rate,velocity,diameter,number of steps but in all cases results were same.
Can any one help me to solve this problem?

atelcikti1 · July 4, 2018, 09:27

Any idea about this problem? Also same for me.

cryabroad · July 5, 2018, 02:25

I don't have the User's guide in hand but if I remember correctly surface injections by default, inject particles from the face center. You can check the number of particles shown by Fluent and the number of faces on your surface, I bet they are the same. Note that DPM uses the concept of particle "parcels", which do not directly represent the actual number of particles but particle streams.

Please refer to the Users' guide for more information, I may be wrong.

January 11, 2017, 10:48	Particle Tracking (DPM Model)	#1
kaveh0a New Member Join Date: Dec 2016 Posts: 15 Rep Power: 9	Hi guys I am trying to simulate a particle tracking project in a 90 bend with DPM model in fluent 14. the viscous model is RSM-EWT. In DMP model i set the " Max number of steps" to 5000 and " step length factor" to 5. there is no interaction between particle-particle and particle-continuous phase. I have used Rungt-kutta method for "tracking scheme". I also created an injection with this following option: injection type: surface-inlet particle type: inert inject using face normal direction: d=4.7e-06 m v=18 m/s flow rate=1.2e-09 kg/s this is equal to 25000 particle. in every run that i have performed just 336 particle were tracked. I have changed the flow rate,velocity,diameter,number of steps but in all cases results were same. Can any one help me to solve this problem?

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July 4, 2018, 09:27		#2
atelcikti1 Member Join Date: Mar 2017 Posts: 61 Rep Power: 9	Any idea about this problem? Also same for me.

July 5, 2018, 02:25		#3
cryabroad Senior Member Ruiyan Chen Join Date: Jul 2016 Location: Hangzhou, China Posts: 162 Rep Power: 10	I don't have the User's guide in hand but if I remember correctly surface injections by default, inject particles from the face center. You can check the number of particles shown by Fluent and the number of faces on your surface, I bet they are the same. Note that DPM uses the concept of particle "parcels", which do not directly represent the actual number of particles but particle streams. Please refer to the Users' guide for more information, I may be wrong.