Could you explain me what "Order=1" stands for?

Yoseob Shim
Yoseob Shim Altair Community Member
edited November 2023 in Community Q&A

Hello,

I am running MotionSolve and it shows some information like below.

In my understanding, "H" stands for time step size and "Max Phi" stands for residual (error by constraint), am I correct?

My questions are;

1. I can't find explanation for "Order", could you explain me what this means?

2. Is there any typical value or level for "Max Phi" to guarantee accurate result?

3. Can I write information in below window as ASCII file?

Thank you in advance.

 

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Best Answer

  • Ganesh Shanmugam
    Ganesh Shanmugam
    Altair Employee
    edited November 2023 Answer ✓

    Hi Yoseob,

    Yes, H stands for step size and Max Phi is the maximum residual.

    Order is the current Integrator order, Higher orders lead to higher accuracy, but lower stability in the numerical method. 

    "Max Phi" less than your constraint tolerance guarantees the accurate results and it is taken care by MotionSolve to ensure it is satisfied

    The information in the window is available in the .log file.

    Regards,
    S. Ganesh

     

Answers

  • Ganesh Shanmugam
    Ganesh Shanmugam
    Altair Employee
    edited November 2023 Answer ✓

    Hi Yoseob,

    Yes, H stands for step size and Max Phi is the maximum residual.

    Order is the current Integrator order, Higher orders lead to higher accuracy, but lower stability in the numerical method. 

    "Max Phi" less than your constraint tolerance guarantees the accurate results and it is taken care by MotionSolve to ensure it is satisfied

    The information in the window is available in the .log file.

    Regards,
    S. Ganesh

     

  • Yoseob Shim
    Yoseob Shim Altair Community Member
    edited November 2023
    Ganesh Shanmugam said:

    Hi Yoseob,

    Yes, H stands for step size and Max Phi is the maximum residual.

    Order is the current Integrator order, Higher orders lead to higher accuracy, but lower stability in the numerical method. 

    "Max Phi" less than your constraint tolerance guarantees the accurate results and it is taken care by MotionSolve to ensure it is satisfied

    The information in the window is available in the .log file.

    Regards,
    S. Ganesh

     

    Hello Ganesh,

    I appreciate for your kind and detail answers. your answers are very helpful to me. 

     

    Best Regards,

    Yoseob.

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