EDEM API: Particle Body Force - Particle Growth Cycle

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.

Regards

Stephen

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

Hi Tony,

There are also the EDEM API tutorials which would be helpful go to through:

You can input data to an API model via a Text File or user input via the user interface. You have to code this in if you want to use something like the wheel to add an input. There is a guide here:

https://help.altair.com/edem/topics/coupling_interface_programming_guide/api_gui_guide_c.htm

However that's not where I would start out, I would recommend just coding the name in directly. In the particle removal example there is the code:

    // Get the geometry name as a string

    const std::string geometry_name = GEOM_NAME.getString();


	// Check if the particle is in contact with the geometry

    if (strcmp(element2.type, geometry_name.c_str()) == 0)

	{


		//update mass passed custom prop with the mass of the particle removed

		double* massPassedDelta  = elem2CustomProperties->getDelta(iMASSPASSED);

        massPassedDelta[0] += element1.mass;


        //remove particle

        m_particleMngr->markForRemoval(element1.ID);


	} 

This checks if element2.type (the geometry) has the same name as user defined geometry_name string, and if so then removes the particle.

If you wanted to apply different growth rates to different particles, or similar you would want code more like:

const std::string name1 = "particle1";


const std::string name2 = "particle2";
if (strcmp(element1.type, name1.c_str()) == 0)

{
//apply growth rate for particles called "particle1" here
}
else if(strcmp(element1.type, name2.c_str()) == 0)

{
//apply growth rate for particles called "particle2" here
}

note that element1 is always a particle, element2 can be particle or geometry so should also check for name of element2 if it's a Contact Model. If using a Body Force its "particle.type" not "elementn.type"

The above code example if for CPU which is always a good place to start coding as it's easier to debug, if you are using shapes that run on CPU like Spheres, polyhedral particles run on GPU only but you could still run a CPU sphere test case.

Regards

Stephen