Lighthill's equation

Lighthill's equation describes how sound waves are generated by moving objects, like an airplane wing or a jet engine. It mathematically relates the sound produced to changes in pressure and velocity of the fluid (air) caused by the object’s movements. Essentially, it helps explain how turbulence and rapid changes in airflow lead to noise, providing a foundation for understanding and controlling sound in aerodynamics and engineering. This equation is key for designing quieter aircraft engines and studying aeroacoustic phenomena.