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by nether 4005 days ago
no, we can't. we currently do not have the CPU power to do molecular simulations of fluids and solids (beyond the grain level) at large scales, that's why we still have supercomputers working at simplified versions. additionally, we don't have 100% fidelity in knowing environmental conditions, what the weather is doing at that exact point, the exact velocity/temp field of the atmosphere (which is constantly changing) at the molecular scale, which would be essential for a 1:1 simulation.

https://en.wikipedia.org/wiki/Direct_numerical_simulation