Question with particle body force

Question

Hi,

I'm planning to use particle body force(PBF) to make the total force on particles in the z-direction zero, but how can PBF return a specific component?

For example, in x and y direction with +=, but in z direction with =0.0.

Thanks

Raheem Sterling_22160 · Answer

Hi Stephen,

Now I am using the API with NExternalForceTypesV3_0_0::SResults in EDEM 2022.1, for return value of results.force, there are no  choice of indibvidual component like results.force.z, only results.force.getZ() or results.force.setZ().

Regards!

Raheem

Stephen Cole · Answer

Hi Raheem,

If using the latest version of the API you can use results.force.component to return individual component of theforce. e.g.

results.force.x += calcualted_value;
    results.force.y += calcualted_value;
    results.force.z = 0.0;

The older version of the API has the format:

calculatedForceZ += calcualted_value;
    calculatedForceY += calcualted_value;
    calculatedForceX = 0.0;

Best to be aware the latest versions of the API Body Force will overwrite forces calculated in the chain if using = however the older version will not overwrite contact forces, only overwrite forces calculated in the body force.

Regards

Stephen