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General increasing sub-steps question


5DNick

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Dear ODForcers,

I have a question regarding increasing sub-steps to increase quality and accuracy of ANY dynamic sim [NB: this ALWAYS seems to be suggested by tutorials].

Obviously having less is helpful for iteration testing speed, however I find whenever I increase them I nearly always get dramatically different results, whether RBD, FLIP, PYRO, etc (or combos of these).

Having had a bit of a think about this I was wondering what issues there are with cranking the sub-steps.

 

I imagine 2 things may affect it:

 

1. Vector and Scalar quantities scaling differently (although maybe there's tricks in the solvers to get around this) (and surface stuff, 2D?)

 

2. [and I imagine this is the most important] Chaos Theory

 

Anyway, trying to learn to be an FX TD from home and any advice and chat is MUCH appreciated.

 

Thanks

 

5D

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