Why the time step is smaller than the value setting in mass scaling

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

Hi all,

I think the time step should be larger than the value setting in the /DT/NODA/CST. However, in my test, I found the time step sometimes smaller than this value. Why this happen? 

 

What's more, my case terminate with an error when using mass scaling. The case terminates normally without using keyword /DT/NODA/CST. What's the problem?

 

I have uploaded my engine file and out file.

 

<?xml version="1.0" encoding="UTF-8"?>2017-11-22_200225.thumb.png.a3854c1e2bf5649e8dd96a581cd11146.png

 

/DT/NODA/CST
0.67  0.8E-4

 

Roy

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2017

    Hi Roy,

    With the /DT/NODA/CST we are trying to impose a time step to the run. But during the run due to interfaces or nodes..etc the time step may even go down and the solver will add more mass to the system thereby it will be try to be back to the imposed value.

    In your model the issue is with the interface id 62. Please check the same for any penetrations also.

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