I think it's called Helmholtz.
Helmholtz resonance is more commonly called inertial supercharging, it is the effect of air moving through the manifold while the valve is open, and then when the valve closes, it sends a pressure wave back down the intake runner, and it bounces off the throttle plate, and then returns to the valve, and back and forth in diminishing waves, sort of like making a wave in a bathtub, bouncing it back and forth. as for engine performance, the length of the runner can be tuned so that at a specific engine rpm range, the wave returns to the valve at the same time that the valve opens again, thus resulting in a higher pressure of air charge at the valve, it is actually possible to exceed 100% volumetric efficiency on a naturally aspirated engine due to the effects of helmholtz resonance. there are also positive, and negative effects on frequency of the pressure waves based on intake runner diameters, and this is why lower rpm torque motors utilize a long narrow runner, and high rpm horsepower motors utilize short fat runners, nowadays, many manufacturers have a changeover valve in the intake allowing the engine benefits both at the top and the bottom of the rpm range