particle tracking

banerji · March 17, 2010, 17:52

i am simulating a water treatment reactor:it is a simple pipe with with one inlet and one outlet. When I make particle Injection they stop in the middle and I see the report as:

injected:12 escaped:0 incomplete:12

why aren't they coming out and when I checked pathlines they look okay

Please help me if you have an idea

wiebe · March 19, 2010, 10:32

Hi Banerji,

It seems that there is a maximum number of simulation steps for your particle tracking. I don't know what software you use, but there is probably a setting for this somewhere. (Increase it to have more steps.)

Regards,
Wiebe.

Quote:

Originally Posted by banerji

i am simulating a water treatment reactor:it is a simple pipe with with one inlet and one outlet. When I make particle Injection they stop in the middle and I see the report as:

injected:12 escaped:0 incomplete:12

why aren't they coming out and when I checked pathlines they look okay

Please help me if you have an idea

carmen · March 19, 2010, 10:44

Hi I’m user of fluent.In my thesis i investigate two phase flow with solid-liquid.We use magnetic force to a field whic magnetic and nonmagnetic particles are suspended in a liquid for separating magneting particles from nonmagnetic particles.can you help me for choosing true model. DPM,mixture,euler which have to be choosen.My solution is dilute

wiebe · March 19, 2010, 11:21

Hi Carmen,

For this you probably need to track individual particles, (that means the DPM model) In addition to this, you will need to model the influence of the magnetic field somehow. There is a magnetohydrodynamic module, (search for MHD) but I have no experience using it.

Good luck,
Wiebe.

carmen · March 19, 2010, 12:27

thks wiebe but i have a problem for lading particle particle will flow with flow but in dpm it ask me start end stop time what will i do

banerji · March 20, 2010, 16:38

Thank you very much Wiebe, I increased the number of steps and all particles escaped. by the way i am using Fluent.

banerji · March 20, 2010, 16:50

Another small question: does fluent select automatically the appropriate number of particles to inject ? I want to increase the number of particles but i can't find how to do it.

wiebe · March 24, 2010, 09:48

The number of particles tracked depends on the type of source. single is just one particle, surface is one particle per cell on the surface, but for example a cone lets you select the number of particles yourself.

wiebe · March 24, 2010, 09:55

Hi Carmen,

the start and stop times affect when the particles are released. If for instance your simulation is 100 seconds, but you only want to release a puff of smoke in the first two seconds, set the start time to 0 and the stop time to 2 for the injection. Particles will be tracked the rest of the time, but no new particles will be released.

Wiebe.

alikami · March 27, 2010, 14:07

Hi i am simulating flow through a convergent-divergent conical nozzle...
with a laminar only gas solution convergent
with particles also converged but no difference ????

any one can help,,,,
Thanks
Alikami

March 17, 2010, 17:52	particle tracking	#1
banerji New Member banerji Join Date: Dec 2009 Posts: 22 Rep Power: 16	i am simulating a water treatment reactor:it is a simple pipe with with one inlet and one outlet. When I make particle Injection they stop in the middle and I see the report as: injected:12 escaped:0 incomplete:12 why aren't they coming out and when I checked pathlines they look okay Please help me if you have an idea

March 27, 2010, 14:07	gas - particle flow thru CD nozzle	#10
alikami Member ali Join Date: May 2009 Posts: 58 Rep Power: 16	Hi i am simulating flow through a convergent-divergent conical nozzle... with a laminar only gas solution convergent with particles also converged but no difference ???? any one can help,,,, Thanks Alikami

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March 19, 2010, 10:44		#3
carmen New Member carmen dain Join Date: Mar 2010 Posts: 2 Rep Power: 0	Hi I’m user of fluent.In my thesis i investigate two phase flow with solid-liquid.We use magnetic force to a field whic magnetic and nonmagnetic particles are suspended in a liquid for separating magneting particles from nonmagnetic particles.can you help me for choosing true model. DPM,mixture,euler which have to be choosen.My solution is dilute

March 19, 2010, 11:21		#4
wiebe New Member Wiebe Zoon Join Date: Mar 2009 Posts: 10 Rep Power: 17	Hi Carmen, For this you probably need to track individual particles, (that means the DPM model) In addition to this, you will need to model the influence of the magnetic field somehow. There is a magnetohydrodynamic module, (search for MHD) but I have no experience using it. Good luck, Wiebe.

March 19, 2010, 12:27		#5
carmen New Member carmen dain Join Date: Mar 2010 Posts: 2 Rep Power: 0	thks wiebe but i have a problem for lading particle particle will flow with flow but in dpm it ask me start end stop time what will i do

March 20, 2010, 16:38		#6
banerji New Member banerji Join Date: Dec 2009 Posts: 22 Rep Power: 16	Thank you very much Wiebe, I increased the number of steps and all particles escaped. by the way i am using Fluent.

March 20, 2010, 16:50		#7
banerji New Member banerji Join Date: Dec 2009 Posts: 22 Rep Power: 16	Another small question: does fluent select automatically the appropriate number of particles to inject ? I want to increase the number of particles but i can't find how to do it.

March 24, 2010, 09:48		#8
wiebe New Member Wiebe Zoon Join Date: Mar 2009 Posts: 10 Rep Power: 17	The number of particles tracked depends on the type of source. single is just one particle, surface is one particle per cell on the surface, but for example a cone lets you select the number of particles yourself.

March 24, 2010, 09:55		#9
wiebe New Member Wiebe Zoon Join Date: Mar 2009 Posts: 10 Rep Power: 17	Hi Carmen, the start and stop times affect when the particles are released. If for instance your simulation is 100 seconds, but you only want to release a puff of smoke in the first two seconds, set the start time to 0 and the stop time to 2 for the injection. Particles will be tracked the rest of the time, but no new particles will be released. Wiebe.