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Particle Disappearing During Simulation

Good day,

I hope this finds you well.

Please, can anyone help with the reason why the particles generated during the simulation are disappearing over the course of the simulation.

I have attached a picture (titled "before" and "after") to the question showing the before and after.

Thank you.

Johnson.

After.png

Before.png

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EDEM

English

v2022.0

Accepted answers

PrasadAvilala

Hello, Jerrin,

I hope this finds you well.

I tried using a lower timestep of 10% but still the same result.

Also, used an auto timestep but still the same result.

I have included a video that explains what is happening better for each of them.

Thank you.

Johnson.

Hi Johnson,

As Jerrin said time step play a crucial role for stability of particles but in this case to me time step might not be the culprit.

I suspect that the particle mass might not be updated, can you please check under Bulk material-->Particle (User defined name)--> properties

is auto calculation checked or not, if not please activate the check box and try re-running the simulation and let us know the update

Thanks,

Prasad A

All comments

jerrinjobs

Hi Johnson

The pictures do not tell a lot about your simulation. But one reason could be your timestep. Try reducing your timestep to about 20% of your Rayleigh timestep, and check if you still see this behavior.

Hope this helps.

Thanks,
Jerrin Job

Johnson

Hello, Jerrin,

Sorry about the picture. I will look into the timestep.

Thank you.

Johnson.

Johnson

Hello, Jerrin,

I hope this finds you well.

I tried using a lower timestep of 10% but still the same result.

Also, used an auto timestep but still the same result.

I have included a video that explains what is happening better for each of them.

Thank you.

Johnson.

Particle10%timestep.wmv

ParticleAutotimestep.wmv

PrasadAvilala

Hello, Jerrin,

I hope this finds you well.

I tried using a lower timestep of 10% but still the same result.

Also, used an auto timestep but still the same result.

I have included a video that explains what is happening better for each of them.

Thank you.

Johnson.

Hi Johnson,

As Jerrin said time step play a crucial role for stability of particles but in this case to me time step might not be the culprit.

I suspect that the particle mass might not be updated, can you please check under Bulk material-->Particle (User defined name)--> properties

is auto calculation checked or not, if not please activate the check box and try re-running the simulation and let us know the update

Thanks,

Prasad A

Johnson

Hi Johnson,

As Jerrin said time step play a crucial role for stability of particles but in this case to me time step might not be the culprit.

I suspect that the particle mass might not be updated, can you please check under Bulk material-->Particle (User defined name)--> properties

is auto calculation checked or not, if not please activate the check box and try re-running the simulation and let us know the update

Thanks,

Prasad A

Hello, Prasad,

It works fine now with the Auto calculation checked.

Thank you so much.

Johnson.

Johnson

Hi Johnson,

As Jerrin said time step play a crucial role for stability of particles but in this case to me time step might not be the culprit.

I suspect that the particle mass might not be updated, can you please check under Bulk material-->Particle (User defined name)--> properties

is auto calculation checked or not, if not please activate the check box and try re-running the simulation and let us know the update

Thanks,

Prasad A

Hello, Prasad,

I posted a question on the stress relaxation few hours ago. Please can you help me look into that.

Thank you.

Johnson.