[vinerm]

All you need is a small patch on one of the sides. So, one side of the cylinder will be one big circular surface while the other side will have one small circular surface and one big annular surface around it. Small surface will be used as air inlet as well as same location will be used for injection. Do note that Orifice Atomizer requires coordinates and not surface.

[Swish31]

I ran it.
I can't see the results as i cannot click the pulse button in particle tracking. Looks like it is frozen. What to do?

[vinerm]

You don't need to use Pulse for results. Run the simulation. While running, it should show a positive number of tracked particles. If it is 0 then there is problem with the injection setup. If it is there, then, go to Particle Tracks, Select Injection from the list, and then Display. No need to use Pulse.

[Swish31]

Particles tracked are not zero but i can't see their paths.
Seems like there are very few particles as well.

[vinerm]

What does Fluent show in its text interface when you click on Display for Particle Tracks?

[Swish31]

After calculation is done and click on display in particle tracks, it shows this

Calculation complete.
number tracked = 42, escaped = 42, aborted = 0, trapped = 0, evaporated = 0, incomplete = 0, incomplete_parallel = 0, shed = 0

DPM Iteration ....

[vinerm]

Could you share a snapshot of Particle Tracks panel?

[Swish31]

Here sir, have a look at these images.

https://drive.google.com/open?id=11Z...SmSkruLlh0PRI3

Also i have set Dpm injections for an interval of 10 iterations. When i run the problem, the number tracked in DPM injections becomes zero after the first or first 2 injections.

[vinerm]

Ah! That's because you have chosen point for Track Style. Change it to line or increase the size of the point. Currently, those might be too small to be visible.

Secondly, you have left stop time to 0. That means, injection happens only for the first time-step. Set it to a high value, say, 1000.

[Swish31]

There is no line option.
Only point and sphere.
I scaled the point to a larger size but still no good.
Could there be any problem with my injection?

[vinerm]

That happens if you enable Unsteady Tracking. If you do that, you need to run the simulation for enough time to ensure that particles have traveled some distance into the domain. Only then you will be able to display particles. 42 should also be visible but either right at the injection location or at the outlet, depending upon what time-step you used.

[Swish31]

I let it run for a good 500 iterations and stop time as 100s.
Still it is not visible.

[vinerm]

Is your simulation steady-state or transient?

[Swish31]

It is steady state

[vinerm]

Then, you need to ensure that there are enough time-steps given for particles. Since flow is steady-state, you need to specify total time-steps in DPM Panel under Unsteady Tracking. Default would be 1. Increase it such that particles are able to go from injection point to outlet in time determined using product of number of time-steps and time-step specified in DPM panel. For testing, just increase it to 100, run the simulation for 50 or so iterations, and then display tracks. Increase the point scale to 1 from default 0.1 under Particle Style.

[Swish31]

Dear sir,
i tried total number of steps from 100 to 500 and particle time step size from 0.001 to 0.0001.
Still no good.

[vinerm]

Do note that there are three parameters, Max. number of steps, Particle Time-Step Size, Number of Time-Steps. The last two are relevant for Unsteady Particle Tracking only. It appears you are changing only Max. number of steps. Those should be at least 500 for Unsteady Tracking. But you also need to increase Number of Time-Steps from 1 to higher value, say, 100.

[Swish31]

Sir i know.
I have set the maximum number of steps to 500 and then changed to 1000 as well in addition to the above mentioned changes.

[vinerm]

As you run the simulation, do you see an increase in the number of Tracked Particles? For the time being, disable Unsteady Particle Tracking.

[Swish31]

No sir, the number of tracked particles do not increase.

I disabled unsteady particle tracking and ran the problem. Now the particle tracks are visible nut however these particles are not travelling in the Y axis direction but rather are in the Z axis direction only.

I checked the boundary conditions, gravity and injection parameters. Everything is given with respect to Y axis only then why this?

https://drive.google.com/open?id=1LD...i607dges73vdc5