EDEM API: Particle Body Force - Particle Growth Cycle
Altair EmployeeOverview
This API allows you to simulate any kind of particle expansion/growth/swelling and shrinkage in EDEM. There is also an example attached that shows the usage of the API.
Usage/Installation Instructions
- Extract the zip file attached. Copy the 'ParticleGrowthCycle.dll' and 'ParticleGrowthCycleInput.txt' from the 'example' folder to the directory of your EDEM simulation.
- Add the plugin model in 'Particle Body Force' of the Physics section.
- You must enter three different values - expansion/shrinkage rate, final scale and start time of the expansion/shrinkage, in the preference file (ParticleGrowthCycleInput.txt).
Use negative values for shrinkage. Higher the rate, faster the process. - You can have multiple lines of the values to indicate different cycles of swelling and shrinkage in your simulation. Note that you can have a maximum of 40 rows only.
All the particles in your simulation will grow/shrink at the rate you specify in the preference file.
Post-Requisite
If you are interested in just the expansion/shrinkage once, and not necessarily the cycle of expansion/shrinkage, you can refer to this API: https://community.altair.com/community/en/edem-api-particle-body-force-particle-growth?id=kb_article&sysparm_article=KB0122138
You will also be able to add different rates for different particles using the linked API.
Comments
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Hi
When I opened the example this error showed up:
WARNING : Plugin : Could not load plugin file:
D:/ParticleGrowthCycle/example\ParticleGrowthCycle.dll
May I know what I should do to solve this problem?0 -
Please use EDEM version 2024.1 or later. Hope that helps.
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Hi Jerrinjobs
I have tried using Altair 2024.1 but the error still occurred.
I download the file and open it, without any modification or changing the file location. But the error still occur.
May I know what I should do? I googled my problem, and one post mentioned that I need to recompile the plugin.0 -
Hi,
Recompiling often would work, as it may not be loading if you don't have the required pre-requisites on your computer and installing visual studio and compiling resolves this. You can also just install the pre-requsities e.g.
It could also be file permissions, you will need to have read/write/execute permissions for the folder containing the .dll.
RegardsStephen
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Hi, this is a great API code that it worked well for examples and my dem simulation. I would like to know how to add different rates for different particles. This was not explicitly stated in the link provided which is about "particle growth". I looked at both codes and tried to modify "ECalculateResult CParticleGrowthCycle::externalForce". However, the particles remain unchanged.
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Hi @TonyC I'd recommend watching the intro to EDEM API YouTube series:
It would be under the externalForce function in CParticleGrowthCycle.cpp (for CPU) and PartilceGrowthCycle.cu (for GPU).
You need to search out a particle type by name (particle.type) and apply the apply the code to this type only.
We have an example for Geometries where we only remove particles contacting a specifically named geometry:
Regards
Stephen
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