Aerodynamic noise is a type of noise that is generated by the motion of fluids, around objects. Examples of aerodynamic noise include wind noise around buildings or vehicles, and noise generated by aircraft engines.
To predict aerodynamic noise, simulations can be performed using computational fluid dynamics (CFD) software. Specifically, Large Eddy Simulation (LES) can be used to model turbulent flows, which are a common source of aerodynamic noise. LES is a method that uses numerical algorithms to simulate the largest turbulent eddies in the flow, while modeling the smaller eddies using subgrid-scale models.
Additionally, a weak compressible flow model can be used to account for the effect of pressure oscillations on the generation of noise. This is important because pressure fluctuations in the fluid can cause sound waves to be generated, leading to noise.
To calculate the frequency of the noise, a Fast Fourier Transform (FFT) can be performed on the CFD simulation results. This allows the noise frequency spectrum to be obtained, which can provide insights into the dominant sources of noise and their frequencies.
