Abstract
This paper presents the workflow and the results of fluid dynamics and aeroacoustic simulations for an air-cooling system as used in electronic devices. The setup represents a generic electronic device with several electronic assemblies with forced convection cooling by two axial fans. The aeroacoustic performance is computed using a hybrid method. In a first step, two unsteady CFD simulations using the Unsteady Reynolds-Averaged Navier-Stokes simulation with Shear Stress Transport (URANS-SST) turbulence model and the Scale Adaptive Simulation with Shear Stress Transport (SAS-SST) models were performed. Based on the unsteady flow results, the acoustic source terms were calculated using Lighthill’s acoustic analogy. Propagation of the flow-induced sound was computed using the Finite Element Method. Finally, the results of the acoustic simulation are compared with measurements and show good agreement.
Highlights
In today’s world, the dimensions of electronic components are continuously decreasing
The first eigenmode shows a vibration at the inlet section of the electronic device with an eigenfrequency of 2320 Hz
The second eigenmode causes a deflection of the mainboard area at the outlet with an eigenfrequency of 2484 Hz
Summary
In today’s world, the dimensions of electronic components are continuously decreasing. While many electronic devices are consuming less energy than a few years ago, the density of the chips assembled on a printed circuit board is increasing. This higher density leads to less heat dissipation by natural convection, which demands forced convection in order to prevent overheating. The noise emission has to be low to please the users; on the other hand, these devices have to meet strict industrial regulations with a maximum allowable noise emission in the working environment To meet these requirements, the prediction of the noise emission is an essential tool to avoid claims and restrictions. Numerical simulations are not subject to these restrictions and provide a strong tool for acoustic optimizations
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