Total energy not constant at impact

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello everyone,

 

I am simulating an impact of a cylinder on a plate and I have found something not coherent. When the cylinder hits the plate, the total energy is not constant anymore. But it should. Does someone know why the total energy increases and then decreases ?

 

Thank you for your help.

 

Emilien

<?xml version="1.0" encoding="UTF-8"?>energies.png

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited April 2016

    Hi,

    Could you share us .out file of the run?

     

    Regards

    Rahul R

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    Here they are.

     

    Regards

    Emilien

    Unable to find an attachment - read this blog

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited April 2016

    Hi,

    See attached screenshot.

    Regards

    Rahul R

    <?xml version="1.0" encoding="UTF-8"?>Total Energy.JPG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2016

    Hello,

     

    As you can see, Y-velocity (radial velocity) is not null, exactly when the total energy is increasing and decreasing. How do you explain it ? Would the Y-velocity have a link with the derived function of the total energy ? The Y-velocity curve shows the radial velocity of which part ?

     

    At the end of the computation, the total energy is not increasing or decreasing anymore.

     

    Regards,

    Emilien

    <?xml version="1.0" encoding="UTF-8"?>energies.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2016

    Hi Emilien,

     

    Can you check the animation of the simulation for any vibrations?

     

    I think the energy transformed into vibrations will be a fraction of total energy. 

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