[Abeer]

Hello everyone,

I am trying to simulate the motion of solid particles in a cylinder filled with air in ANSYS FLUENT. but it was difficult to insert the particles in different size (1 mm &1 cm) into the domain. I want them to be already present in the domain at t=0 with random initial distribution.
I want to perform particle tracking in the Lagrangian frame after different intervals of time.
I have inserted the particle using injection file, but for uniform particle diameter and distribution. It is possible to add 200 particles in different diameter with a random initial distribution and radial initial velocity in the domain without having to inject them.

Thanks in advance.!

[Yasser]

You can use DEFINE_DPM_INJECTION_INIT macro where you can determine the initial location, diameter and velocity of the partiles.

Search GitHub for a C## function that generate random numbers and you can use it for generating random locations and diameters

[Abeer]

Thank you for your replay! I solved it. I create additional MATLAB injection file and I set a random position of the particle, I made the animation in Fluent, but it is difficult to recognize size of the particle, it is possible to animate different diameter size ? or should I use another model like MPM to perform different size of particle?

[Yasser]

If you use the macro mentioned above, you will be able to loop over the particles at time 0 and set the diameter for each one. Look in the UDF manual, there is an example provided. You need to go beyond the example by adding your random function to generate a random number within the limits ...

[Abeer]

Thank you very much for your answer. I create injection file in MPM model. It is looking good. After I create and display the particle, as next I should define the animation sequence, which should be opened from the Solution Animation dialog box, and this allows me to define what each sequence displays. So, the problem now I could not fine the animation sequence in the calculation activities dialog box as seen in below images. Also the animation dialog box doesn’t show me any sequence animation command.
I wonder if I have to add another command or any procedure to make the sequence animation dialog box available.
Could you help me to fix this problem?
Thank you in advance.
Image1.jpg

Image2.jpg

Image3.jpg

[Yasser]

You need to create the frame or view you want to animate. Go to results graphics and create contours, pathlines, vectors ... whatever you create, will be available for animation

[Abeer]

Thank you very much for your answer , I will try it and hopefully it will work!

[Abeer]

Originally Posted by Yasser

You need to create the frame or view you want to animate. Go to results graphics and create contours, pathlines, vectors ... whatever you create, will be available for animation

hello, I tried to use DPM Post processing, the problem after writing a file in the animation playback screen, it was difficult to visualize the motion of the particle, due to the high length to diameter ratio of the pipe (L=1m, D=0.003m). so in the MPM panel I could display injection, it is looking very fine, and I could visualize the location and motion of particle during the simulation. Could you please suggest me a way how to save animation in MPM?

Other problem I faced in MPM, after I have created the periodicity in fluent, use the TUI command: define>b-c>m-z>m-p….., I am not able to add the MPM model, using define>mod>add, because TUI still defined with Boundary condition. It is possible to switch off from periodic BC to add MPM model?

Thanks, in advance!

Best regards