CAA of an Air-Cooling System for Electronic Devices

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.

[1]  A. N. Kolmogorov.  Equations of turbulent motion in an incompressible fluid , 1941 .

[2]  Florian R. Menter,et al.  A Scale-Adaptive Simulation Model using Two-Equation Models , 2005 .

[3]  Lixi Huang,et al.  Characterizing computer cooling fan noise. , 2003, The Journal of the Acoustical Society of America.

[4]  W. Marsden.  I and J , 2012 .

[5]  Stefan Becker,et al.  Numerical simulation of flow‐induced noise using LES/SAS and Lighthill's acoustic analogy , 2009 .

[6]  Kevin Barraclough,et al.  I and i , 2001, BMJ : British Medical Journal.

[7]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[8]  Lixi Huang,et al.  Acoustic analysis of a computer cooling fan , 2005 .

[9]  Colin Novak,et al.  Review of computational aeroacoustics for application in electronics cooler noise , 2006 .

[10]  E. Baugh.  Acoustic Limitations in Notebook Thermal Design , 2008, 2008 10th Electronics Packaging Technology Conference.

[11]  Manfred Kaltenbacher,et al.  Numerical Simulation of Mechatronic Sensors and Actuators , 2004 .

[12]  Florian R. Menter,et al.  The Scale-Adaptive Simulation Method for Unsteady Turbulent Flow Predictions. Part 2: Application to Complex Flows , 2010 .

[13]  Colin Novak,et al.  Graphics processing unit cooling solutions: Acoustic characteristics , 2006 .

[14]  M. Lighthill.  On sound generated aerodynamically I. General theory , 1952, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[15]  F. R. Menter,et al.  Revisiting the Turbulent Scale Equation , 2006 .

[16]  B. Launder,et al.  Mathematical Models of turbulence , 1972 .