[GTP]

I think it would make more sense to limit the analysis to technologies that let you build a Turing-complete machine, but indeed sometimes you find people counting your examples as computers, because they are computing a specific function.

[OscarCunningham]

That's assuming that wind tunnels are not Turning-complete. Terry Tao has this fantastic idea of proving the Navier-Stokes equations blow up by proving the existence of a 'fluid computer'. https://terrytao.wordpress.com/2019/05/31/searching-for-sing...

[GTP]

I will have a look at it