Hi, I'm still new at fluent, I did a 3-d simulation of water coming into a tank and then going out, I animated my results, checked the velocity vectors, and everything looks fine... I ran the simulation for 15 seconds (until it reached steady state) and wanted to inject some particles and track them to see how they are deposited into the tank. I tried to do some tutorials but they don't really explain how to do that. Can anybody tell me if the steps that i'm following are correct? 1- set my discrete phase model. 2- set Models>Species>Transport & Reaction 3- set injections 4- run the iteration

after I run the simulation, I tried Display>particle tracks and all i can see the the geometry of the tank... I don't see the particles..

Any help would be appreciated.. Thanks

Particle tracking works only with a discrete phase model end not with a transport&reaction model....

try to read User guide manual before performing tutorials and simulations...

A

When you use Display>particle tracks, do you see your injections listed on the panel? Have you selected them?

If so, in the particle track panel, choose report and then step-by-step. Select just the first particle (track single particle stream) and then select track.

What are the co-ordinates and velocities at the initial time step? Is it in the domain? Where you initially set it? Is it flowing into the domain? or out? What are doing with species and reactions? Are the particles changing mass? diameter? If so, what happens with time?

Good luck.

just to give you an idea of my model, it's a 2-d rectangular box, on the left wall, there is a small opening in the middle which is the inlet and on the left wall, there is a small opening on the bottom which is the outlet...

I selected the injection-0 that I created and when I select the report and then just the single particle stream, I select track and I can see the mass , time but without any numbers. It's like the data is not there. here's my injection parameters: 1- coordinates: I selected the injection of the particles 0.01 m inside the tank (next to the inlet), so yes, it is in the domain 2- initial velocity is 0.01 m/s (in my case just in the x-direction)

forget about the species and reactions, I didn't use it since the particles are not changing mass or diameter..

what do you suggest?

I really appreciate your help

You can inject a single inert particle stream. You should decide which material to use. The density of the material will have a significant influence over the the trajectory. Interaction between continuous phase and discrete phase should be activated. Set the duration of injection carefully.

If you need to just see how a fluid packet at the desired location (in front of inlet) travels with time then you can use Display-Path line.

I already chose a material from the fluent database and the interaction between continuous phase and discrete phase is already activated. the duration of injection is over 1 second (starting after 15 seconds of flow).

I'm interested in seeing how the flow travels starting from the front of inlet but the pathlines alone can not help because they don't take account of density.

Maybe you can look at the time again - I have to admit in working with Fluent for almost 20 years and hundreds of cases with particles, I have only run steady-state cases.

You say you ran the fluid flow calcs. for 15 sec. and the particles were only released for 1 sec. of that? Is there some disconnect there?

Allan, I ran the simulation for 15 seconds until it reached steady state, and after that, I stoped the iteration, and then injected the particles. Am I doing it wrong? If yes, what should be the procedure?

thx