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HHT Solver, Hmin Error

jsph_inc
Hi All,
 
I am running the HHT solver for an ADAMS/View model. The simulation errors because the minimum step size is reached. Up to that point the step size is reasonable around 1E-5 / 1E-6 but then hits the minimum.
 
Reducing Hmin does not solve the issue as the solver reaches the new Hmin value and errors.
 
The only work around I have found is adjusting the solver error. I've never encountered this with GSTIFF. The model is contact heavy.
 
Does anyone know what causes this with HHT? Any suggestions to avoid this?
 
joe.
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  • 0
    Hi Alexis,
     
    Thanks for the suggestion. i'll try running the model just before it fails...what will that help with?
     
    Contact is defined using parasolids. Curiously when I substitute 3 of the parasolids with native solids (washer and two bushings) the model is even more unstable and the contact forces are noisier (counter to what I was expecting according to MSC contact presentations).
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  • 0
    Hi Alexis,
     
    Thanks for the suggestion. i'll try running the model just before it fails...what will that help with?
     
    Contact is defined using parasolids. Curiously when I substitute 3 of the parasolids with native solids (washer and two bushings) the model is even more unstable and the contact forces are noisier (counter to what I was expecting according to MSC contact presentations).
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