DPM particle tracking considering particle size

oball · May 31, 2014, 06:22

Hello, I am simulating the particle trajectory in a particle sampler using FLUENT DPM, in which i need to consider the particle collection by interception. That means when the distance between particle center and the wall is smaller than the particle radius, the particles should be considered as collected. However, particle-wall interaction only happened when the particle center hit the wall, not the edges, by default in FLUENT. I think I need to write a UDF to calculate the particle-wall distance and determine whether they touch or not. I am new to UDF. Can anyone ever deal with this problems and point me to some source that i can learn from. Thank you so much!!

Clarence91 · August 25, 2014, 12:34

Hi,

Could you write the UDF?

Thank you.

Clarence91 · September 16, 2014, 12:45

If you were able to get the UDF please reply.

surya.tdr · October 6, 2019, 13:49

hey,
pls help to write this udf...

pakk · October 6, 2019, 14:42

In DPM, particles are simulated as point particles. This is a very basic assumption. The diameter of particles should be much smaller than your typical opening, otherwise it makes no sense to use the method, and you should use a different method, such as 6DOF.

May 31, 2014, 06:22	DPM particle tracking considering particle size	#1
oball New Member Join Date: May 2014 Posts: 4 Rep Power: 11	Hello, I am simulating the particle trajectory in a particle sampler using FLUENT DPM, in which i need to consider the particle collection by interception. That means when the distance between particle center and the wall is smaller than the particle radius, the particles should be considered as collected. However, particle-wall interaction only happened when the particle center hit the wall, not the edges, by default in FLUENT. I think I need to write a UDF to calculate the particle-wall distance and determine whether they touch or not. I am new to UDF. Can anyone ever deal with this problems and point me to some source that i can learn from. Thank you so much!! Last edited by oball; May 31, 2014 at 12:13.

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August 25, 2014, 12:34		#2
Clarence91 Member MarkClarence Join Date: Jul 2014 Posts: 32 Rep Power: 11	Hi, Could you write the UDF? Thank you.

September 16, 2014, 12:45		#3
Clarence91 Member MarkClarence Join Date: Jul 2014 Posts: 32 Rep Power: 11	If you were able to get the UDF please reply.

October 6, 2019, 13:49		#4
surya.tdr New Member surya Join Date: Jul 2015 Posts: 24 Rep Power: 10	hey, pls help to write this udf...

October 6, 2019, 14:42		#5
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	In DPM, particles are simulated as point particles. This is a very basic assumption. The diameter of particles should be much smaller than your typical opening, otherwise it makes no sense to use the method, and you should use a different method, such as 6DOF.