An engine is not steady flow though, Bernoulli does not describe transient. There are also fluid friction losses, you could add Poiseuille's Law, but that would still be laminar, and assume no turbulence.
You can change intake runner length, and plenum volume to increase VE at certain RPM, hence some cars have intake flaps.
A smaller diameter port will have a higher velocity at lower rpm, but "choke" at high rpm, a large port will flow great at high RPM, but have low velocity at low RPM, trade offs that you want matched to the rest of the engine, and its use.