Hello all,
I am trying to simulate flow of particles from a hopper/silo. I keep getting the error stating that there's too many neighbor bins. I have look through a few forums and cant seem to find the solution.
I have set my neighbor bin size to 0.0029, which is 2 times the largest radius of my particles( 2*r_max). I have tried changing the young modulus of particles but still get the same error.
The only way to avoid this error is by scaling down my silo model, which I am not very keen as it affects the mass flow rate of particles(changes the opening size of silo). I've attached the code below (inputt(2).txt) for reference.
I would really appreciate it if anyone can help me out with this. Thanks.
| Attachment | Size |
|---|---|
 inputt2.txt | 7.94 KB |
mschramm | Fri, 03/18/2022 - 15:50
huge youngs modulus
Hello,
Does it error out right away or after the simulation has ran for a few steps?
Using your material properties, 20% ray time is about 2.0e-7, much smaller than what your are using.
I'm suspecting that your simulation is blowing up and since you are using the 'm' boundary condition, spheres do not get removed from the simulation once they cross the simulation boundary.
Instead the boundary grows and this leads to your error message.
You can check the timestep of your simulation by using the fix check/timestep/gran.
https://www.cfdem.com/media/DEM/docu/fix_check_timestep_gran.html