[mostanad]

hi, we are solving an unsteady flow over a cylinder. we want to obtain the pathline for some particular particles.... but we don't know how to start.... is anybody help me?

[sidoubouzareah]

have the same problem fazli, i don't know how to do it!!!
salam

[Dave_88]

If you simply want some pathlines:
Results>Graphics>Pathlines
Select the boundary condition, from which you want to start your pathlines, for example inlet. Then click on display. Modify the lines by increasing step size, steps or path skip.
You also may color the pathlines by certain quantities such as velocity.

[sidoubouzareah]

Thank you very mutch Dave, actually i want to use " export to CFD-post" to tracke the particules trajectories.

In fact, in the Cdf-post, i can display the counters, the velocity fields... but the particles pathlines and tracke trajectory doesn't work.
Just to make you in, it's a rotating cylindre full of viscous fluide (continous phase), in witch we inject from the battom bubbles (dispersed phase of air).
So we want racking the trajectory of bubbles to confirm the rotational particles pathlines in the fluide vortices.

Thanks again Dave,
Best regards.

[hwet]

you need to export particle tracks from fluent then read them in cfdpost as fluent particle tracks

[sidoubouzareah]

Hi Hwet, thank you for your answer,

I do realise exporting particle tracke fluent "*.xml", and import it by cfd-post, but when i wanted to display particle track , or treamlines on cfd-post, it shows only the particles positions as points.

thanks again,

[hwet]

It should not be writing a new file for every time step but updating the file each time.

Do see if this is being done correctly, notice how the size of the particle file being written increases as the simulation proceeds. it will increase from a few kb to 100s of kbs and so on with time.

If not, it means that the particle file is not being saved properly. I have had this problem before. Dont have Ansys right now to tell you the exact process to save the file correctly.

[sidoubouzareah]

thanks again,

There is other thing, when i want de display the particles track, i have to selesct " method> from file > Browse file " *,trk". I can't do it because the droplet " from file" contains only "from file ", and this file *,trk does not exist.

I think the particles track of fluent is not saved properly as you said.

I preciate your help;

[mostanad]

actually i have the problem at first... in particle tracking for transient solutionn... how it can be done??? when you say dpm phase!!!

[sidoubouzareah]

hi Fazil, go to Models>Discret phase model>injections and you have to put your différents parameters as: droplet or inert bubble, position of injection, flow rate, velocity of injection, and also choose teh materials of bubbles from data base.

hope it helps you freind;

[mostanad]

now i track the particles... i want track prticular particles... or two normal elements and obtain the change of angle between them... how i can do these works???