ANSYS LS-DYNA huge during time solution !!!

[admincae]

Good afternoon,

I have a trouble when I want to made a simulation using ANSYS LS-Dyna, because first of all my model implicate couple 200000 elements, which means 2 parts in contact and second part which must interact with first 2 part.

I made a surface to surface contact using automatic contact. After that I made an array table where I put time (0,1) and accereration of gravity (0,9.81). Other applied constrants are on nodes where the component is fixed. So, I used for output frequency 50 .

I have some doubt about during of solution, because tell me that my problem during couple 47 hours to resolve it. My system have a quad core i7 processor, 12 gb memory ram, and 2 harddisk in raid0, windows 7 64bit.

I think somewere is some problem with the setting. But were? How I can reduce the time?

I waiting your advice or opinion. Somebody can explain me?

Best regards.

 

[Drej]

Gravity loads are not suited to explicit solutions. The time step will be tiny. You can try and mass scale parts wherever possible, but try ramping the gravity on over a small time period (e.g. 5ms) and holding it there to check that you only have small inertial oscillations in the response.


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[Drej]

Also, check the stable time increment (check in the .otf file) as your mesh may also be giving you a very small time step.


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