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Very quick: DPM deposition, how to know where it lands?

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Old   September 1, 2010, 05:58
Default Very quick: DPM deposition, how to know where it lands?
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Hi there.

Is there a way to know which specific surface a particle lands on / is trapped on? FLUENT doesn't say, just says x amount of particles trapped.

Thoughts? This is confusing me.
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Old   September 2, 2010, 00:49
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Is the erosion/accretion model used and what kind of particle wall boundary condition is used?
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Old   September 2, 2010, 01:32
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Good food for thought

For this you have to follow particle by fluents step by step particle tracking feature and you will get it

Last edited by Mohsin; September 2, 2010 at 03:06.
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Old   September 2, 2010, 03:58
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Quote:
Originally Posted by xrs333 View Post
Is the erosion/accretion model used and what kind of particle wall boundary condition is used?
I haven't implemented this model as the particles are like droplets of water from a sneeze in a room. I'd like to know the specific location of them when they land... Do you think this is possible? How would you do that?

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Good food for thought

For this you have to follow particle by fluents step by step particle tracking feature and you will get it
Do you refer to the 'Track' function in Disyplay Particle Tracks? This never seems to do anything, even though particles are still suspended.
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Old   September 2, 2010, 04:01
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yes.

U can click on "step by step" particle tracking. It is easy to track single particle so cliking on "track single particle stream" and then click on "file" and then write it somewhere and you will get the tracks of the particle with its position at different time intervals.
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Old   September 2, 2010, 04:21
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Quote:
Originally Posted by Mohsin View Post
yes.

U can click on "step by step" particle tracking. It is easy to track single particle so cliking on "track single particle stream" and then click on "file" and then write it somewhere and you will get the tracks of the particle with its position at different time intervals.
2 questions arise:
1)Do you think it is possible to write every particle trajectory at once?
2)I am more interested in their fate, ie on the surface which they land. How would you do this without an UDF? Basically all I look for is a number of trapped particles per surface ID.
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Old   September 2, 2010, 04:57
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You can use report -> discrete phase -> sample.
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Old   September 2, 2010, 05:07
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Actually my knowledge is limited to the following in ur case:

1. You can cick on pulse button and u can see trajectory of evry particle. With "draw grid" option u can see where the particle lands.

2. you can use " step by step tracking" for the particle to know its position. If "trapped" is turned on for that particle than the last point where it is trapped u can get its position from from step by step tracking.
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Old   September 2, 2010, 08:16
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Quote:
Originally Posted by xrs333 View Post
You can use report -> discrete phase -> sample.
Would you then have to add the injections back into the domain for a single extra iteration?

Also do you think the Accretion model is good for simple water particles landing on a surface?
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