help using the particle tracking and droplets module

[dioum]

Hello everybody!
I want to simulate the dipersion of particle using the particle tracking and droplets but i dont know how to use it. i want to fellow the particule and at the end i want to vizualise it using salome but the only fields that i can see are those include in code saturne. do you know if i can settle a new fields in code saturne that will help follow the particule.
Thanks for your help!
best regards

[Yvan Fournier]

Hello,

Could you please follow the forum recommendations ? Depending on the version of the code you are using, the answer may change, so we at least need to know this.

Starting with version 3.1, post processing options for Particle tracking are in the same place (in the GUI) as for other fields. Make sure the "writer" type matches the output type (trajectories with trajectory writer, particles with particles writer, the rest is ignored). For older versions, I think they are in the Particle tracking page themselves, but am not sure.

Also, with Salome / Paravis (or ParaView), for point data, I recommend loading the "point sprite" plugin before loading your case, and using that as a visualization type for particles (again, works well with recent versions, but I've never tested it myself on older versions).

Regards,

Yvan

[dioum]

HELLO
Thank for your reply!

i use code saturne version 3.0 and salomé version 6-6.0 both include in the last compli caelinux2013.
i try to follow your explanation but i am sorry i can see how to apply it.
can you please give me more detail about where i can find the writer in the interface or the gui and how can apply a new fields that will fellow the conce,ntration of the particle in the simulation.
I really need your help!!
best regards!

[Yvan Fournier]

Hello,

In the GUI, the writer / mesh settings are in the "Calculation control/Output control" section.

For fields that follow the concentration of particles, you simply need to active the particle statistics in "Particles and droplets tracking/Statistics".

The user documentation of versions 3.2 and 3.3 might not be perfectly up to date (some screenshots may date to 3.0), but it should still be usable enough.

Regards,

Yvan

[dioum]

Hello!

Thank for your help!
i want to create a 2d plot to follow the concentration of formaldehyde in the room using code saturne . Is that possible
thank for your reply !

Best regards

[Yvan Fournier]

Hello,

It is possible, but depends what you want to do. If you want a profile along a line or curve, you can do it either directly in the code (see the GUI) or with ParaView or Paravis (with SALOME 6, you may have the older VISU module, which I do not know well).

If you want a mean, min, or max value in the code, you can extract if from the "listing" of the concentration is a user scalar, or compute it and save it to a file in cs_user_extra_operations (you may need to study the examples in EXAMPLES/cs_user_extra_operations* or in the Doxygen documentation) in this case.

Regards,

Yvan

[dioum]

i have just one more question do you know if the particule volume fraction (what is its unit) means the concentration or it is different . if it is different how can definie a new fields and define it as the concentration in kg/m^
. where can i find the exemples that you just mentionned.
sorry to bother you again.
i am really greatful for your help

best regards

[Yvan Fournier]

Hello,

I am not sure about the volume fraction, but it should be either in the user or theory documentation.

The EXAMPLES directory is copied, allong with REFERENCE, in the SRC directory of each case.

Regards,

Yvan

[golnaz5100]

hi,

I have the same problem, can you please let me know how do you obtain the particle concentration?

I do not know whether the particle volume fraction is the concentration or not?

I will appreciate it if somebody help me.

[Yvan Fournier]

Hello,

It is certainlely strongly related, but there may be a conversion factor (assuming a single class of particles).

The volume fraction is adimensional. Does your concentration have units, or is it also adimensional ? If so, it is probably either a volume or a mass fraction, so the conversion should be trivial given the properties of your particles.

I'll check also try to check with people who have a better knowledge of the theory behind the Lagrangian module.

Regards,

Yvan