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Prescribed_Motion_Rigid not as expected

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Posts: 16
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(@richardp)
Paid Intern
Joined: 2 months ago

Hello,

I am trying to run a crush of a tube between to flat, rigid planes. However, the planes are not moving as defined in my curve. I do not understand why.

To make it clear, i have set up another very simple model with a rigid wall, that should move 25 mm in 5 s according to the provided curve. The simulation termination time is 5s. But the wall is initially moving slower. e.g. after 1 s the displacement is 2.5 mm instead of 5 mm, but after 2s 10 mm. Why?

 

In my original simulation i have very short calculation times (only 0.2s), and in that early phase it is completely off.

What am i making wrong?

Regards,

image

 

1 Reply




Negative Volume
Posts: 668
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(@negativevolume)
CEO
Joined: 6 years ago

Your current model has motion defined as velocity in the *boundary_prescribed_motion (vad=0). You need to change vad=2 if you want to use that curve as displacement. 

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