best software for simulate operating machine?

What is the best program for the application of certain operating conditions on the product and the efficiency of the stress test or not.?
For example: the design of conveyor track for a product gypsum or wheat a certain length and a certain design and test the maximum amount can be carried it to move without being broken.
Or a huge tank design and simulation product flow out of it to choose the best design for the exit slot.

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