How is the Power value calculated?

Clemenslischka
Clemenslischka Altair Community Member
edited December 2022 in Community Q&A

Hi all,

i want to study the power consumption in my mixer during mixing. Conveniently EDEM gives this value but i noticed a discrepance when i calculated the Power consumption with the torque via the formula P = 2*Pi*n*torque, resulting in higher values for power.

So i'm wondering how EDEM calculates the power value? And which one is correct obviously..

Thanks a lot!

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Best Answer

  • PrasadAvilala
    PrasadAvilala
    Altair Employee
    edited December 2022 Answer ✓
    Clemens Lischka_20358 said:

    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.

     

    image

     

    Thanks,

    Prasad A

Answers

  • Renan
    Renan
    Altair Employee
    edited December 2022

    Hi Clemens,

     

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

     

    Power = Force*velocity + Torque*angular_velocity

     

    Best regards,

    Renan

  • Clemenslischka
    Clemenslischka Altair Community Member
    edited December 2022

    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!

  • Renan
    Renan
    Altair Employee
    edited December 2022
    Clemens Lischka_20358 said:

    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

  • PrasadAvilala
    PrasadAvilala
    Altair Employee
    edited December 2022 Answer ✓
    Clemens Lischka_20358 said:

    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.

     

    image

     

    Thanks,

    Prasad A

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