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Why is tribocharging model not matching the reference paper?

I am trying to find out why the charge transfer in Altair does not match the equations outlined in the reference paper given?

I am trying to model 1 particle falling on a plane due to gravity

the particle and geometry got charged to the same level which was expected. However, the value does not match the paper given in the documentation of Altair. please tell me why?

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EDEM

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v2022.3

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satri

This is the calculation based on the equation given in the paper

EDEM gives a charge of 2.37E-15nc on particles where, as the equation gives 3.7e-13nc. Why is there such a huge difference? I am only giving Hertz Mindlin contact model, no rolling friction too

satri

I try to stop the simulation aat the time it contacts the ground. Even then the value computed from equation is atleast 100 times more than Altair

Stephen Cole

I try to stop the simulation aat the time it contacts the ground. Even then the value computed from equation is atleast 100 times more than Altair

Hi Shyam,

The code that EDEM uses is:

    double area = 4.0 * PI * (nPhysicalCurvature1 * nPhysicalCurvature1);     double q_s = 2.66e-5 * area;      *chargeMovedToSurface1 = m_modelData.getAlpha() * (q_s - fabs(charge1)) * nTimestep;

Where nPhysicalCurvature1 is the radius of the smallest element in contact.

Regards

Stephen

satri

Hi Shyam,

The code that EDEM uses is:
    double area = 4.0 * PI * (nPhysicalCurvature1 * nPhysicalCurvature1);     double q_s = 2.66e-5 * area;      *chargeMovedToSurface1 = m_modelData.getAlpha() * (q_s - fabs(charge1)) * nTimestep;
Where nPhysicalCurvature1 is the radius of the smallest element in contact.

Regards

Stephen

Hey, yes, I want the information of the sphere to be used, which is correct. I am using the same information to compute in Matlab, too, where I use the equation. So why are the information not matching?

MATLAB evaluation and EDEM evaluation should be same. i am trying to understand where the difference is coming from.