How is the Power value calculated?

Hi Clemens,

The geometry power in EDEM is calculated according to the following equation:

Power = Force*velocity + Torque*angular_velocity

Best regards,

Renan

Hi Renan,

interesting! Is there some theory or source behind this calculation? I can not find anything in the manual. I found that the value can be positive or negative it's mostly negative in my simuations, is there some theory as to what a negative value for power means?

Thanks!

Hi Renan,

 

interesting! Is there some theory or source behind this calculation? I can not find anything in the manual. I found that the value can be positive or negative it's mostly negative in my simuations, is there some theory as to what a negative value for power means?

 

Thanks!

Hi Clemens,

Power can be defined as the rate of doing work or the energy that is consumed by unit time. Based on this we can write:

P = W/t

where P is the Power, W is the work done by the force and t is the time. Since work can be calculated as the dot product between the force and the displacement, we can write:

P = (F . d)/t

Finally, since the velocity is defined as displacement over time, we can write:

P = F . v

So the power can be calculated as the dot product between the force and the velocity. Negative values for power means that force and velocity have opposite directions.

Hope this helps you.

Best regards,

Renan

Hi Renan,

 

interesting! Is there some theory or source behind this calculation? I can not find anything in the manual. I found that the value can be positive or negative it's mostly negative in my simuations, is there some theory as to what a negative value for power means?

 

Thanks!

Hi Clemens,

Negative power indicates, power required to drive particles.

Thanks,

Prasad A