particle tracking time step

alireza2475 · January 7, 2011, 08:40

hi guys
im working on the field of particle tracking in a continuous phase. the relaxation time of the particle is too short and the domain is long relatively. so the computational time is so large for each particle.

i guess the FLUENT DPM uses a changing time step in the integration of the particle equations. in that scheme the integration time step is increased if the relative velocity of the particle and the flow is small enough.

i wanted to know if is there any suitable criterion to handle this scheme?

maysmech · June 21, 2011, 01:51

Hi,
I have a question.
How much is Delta t for particle tracking in a code? Is time step equal to relaxation time?

January 7, 2011, 08:40	particle tracking time step	#1
alireza2475 New Member alireza Join Date: Jul 2010 Posts: 12 Rep Power: 16	hi guys im working on the field of particle tracking in a continuous phase. the relaxation time of the particle is too short and the domain is long relatively. so the computational time is so large for each particle. i guess the FLUENT DPM uses a changing time step in the integration of the particle equations. in that scheme the integration time step is increased if the relative velocity of the particle and the flow is small enough. i wanted to know if is there any suitable criterion to handle this scheme?

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June 21, 2011, 01:51		#2
maysmech Senior Member Join Date: Jan 2010 Posts: 347 Blog Entries: 2 Rep Power: 17	Hi, I have a question. How much is Delta t for particle tracking in a code? Is time step equal to relaxation time?