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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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    Ji Joe,
    Stopping just a fraction before, most times it shows you something gets out of hand hence the failure.
    Native solids getting out of hand may be due to the faceting_tolerance that you are using (possibly default??). This is heavily dependant on what you are trying to represent, but I noticed in the past that if one surface is very complex there may be gaps in the faceting (even if it is considered a solid). In my case this made the contact to reverse and the parts were jammed together, very weird I know.
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  • 0
    Ji Joe,
    Stopping just a fraction before, most times it shows you something gets out of hand hence the failure.
    Native solids getting out of hand may be due to the faceting_tolerance that you are using (possibly default??). This is heavily dependant on what you are trying to represent, but I noticed in the past that if one surface is very complex there may be gaps in the faceting (even if it is considered a solid). In my case this made the contact to reverse and the parts were jammed together, very weird I know.
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