Flow-Induced Noise Optimization of SUV HVAC System using a Lattice Boltzmann Method

2015 ◽  
Vol 8 (3) ◽  
pp. 1053-1062 ◽  
Author(s):  
Abdelhakim Aissaoui ◽  
Ravindra S Tupake ◽  
Vilas Bijwe ◽  
Mohammed Meskine ◽  
Franck Perot ◽  
...  
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Hvac System ◽  
Noise Optimization ◽  
Flow Induced Noise ◽  
Boltzmann Method

Direct Transmission Loss Calculation of Simplified Muffler Configurations Using a Lattice-Boltzmann Method

2013 ◽  
Author(s):  
Adrien Mann ◽  
Franck Pérot
Keyword(s):  
Lattice Boltzmann Method ◽  
Turbulent Flows ◽  
Spatial Resolution ◽  
Lattice Boltzmann ◽  
Transmission Loss ◽  
Fan Noise ◽  
Wind Noise ◽  
Simulation Domain ◽  
Flow Induced Noise ◽  
Boltzmann Method

Lattice-Boltzmann Method (LBM) is broadly used for the simulation of aeroacoustics problems. This time-domain CFD/CAA approach is transient, explicit and compressible and offers an accurate and efficient solution to simultaneously resolve turbulent flows and their corresponding flow-induced noise radiation. Some examples of applications are ground transportation wind-noise problems, buffeting, Heating, Ventilation, and Air Conditioning (HVAC), fan noise, etc. As shown in previous studies, LBM can also be used to accurately handle linear acoustics problems if the source of noise is not a flow but a simple acoustic source. This set of capabilities makes LBM a suitable candidate for evaluating the acoustics performances of exhaust systems and mufflers. Compared to other traditional acoustics methods, LBM presents the advantage to skip tedious volume meshing operations since the mesh generation is fully automatic. Furthermore, considering that all geometrical details are included in the simulation domain and that LBM is explicit, high frequencies mechanisms up to 10–20 kHz can be captured. The upper frequency limit is indeed solely driven by the spatial resolution used to discretize the system. In this paper, three academic 3-D geometries representative of production muffler systems are studied. Transmission Loss (TL) measurements are performed on three configurations and these experiments are reproduced numerically with LBM. The experimental setup is described in a first part and the numerical details are given in a second part and third part. In particular, the method used to calculate the TL in the simulation and the convergence of the results with respect to the spatial resolution are shown. In a third part, the simulations are compared to the TL measurements and a numerical investigation of the effect of geometry details on the simulated results is proposed. This study highlights the sensitivity of acoustics measurements to geometry details.

HVAC Blower Aeroacoustics Predictions Based on the Lattice Boltzmann Method

2011 ◽  
Author(s):  
Franck Pe´rot ◽  
Min-Suk Kim ◽  
Koichi Wada ◽  
Koji Norisada ◽  
Motohiro Kitada ◽  
...  
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Standard Procedure ◽  
Pressure Rise ◽  
Operating Conditions ◽  
Acoustic Measurements ◽  
Noise Sources ◽  
Flow Information ◽  
Flow Induced Noise ◽  
Boltzmann Method

Two centrifugal HVAC fan and casing geometries are experimentally and numerically investigated. Aerodynamic and acoustic measurements are performed at three operating conditions following an ISO standard procedure. Explicit and compressible CFD/CAA simulations based on the Lattice Boltzmann Method are performed for six configurations. From these simulations, flow information in term of pressure rise as a function of the mass flow rate and noise are obtained at the same time and compared to experiments. Additional post-processing is performed to have an insight on the origin and location of flow-induced noise sources.

Flow Induced Noise Predictions of an Automotive Alternator Using a Lattice Boltzmann Method

2014 ◽  
Author(s):  
Vincent Le Goff ◽  
Vincent Vidal ◽  
Michel Fakes ◽  
Philippe Chiozzi ◽  
Erwan Le Goff ◽  
...  
Keyword(s):  
Product Development ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Design Space Exploration ◽  
Experimental Testing ◽  
Product Development Process ◽  
Noise Generation ◽  
Flow Induced Noise ◽  
Automotive Alternator ◽  
Boltzmann Method

The increasing demand for comfort and quietness from the automotive industry transforms the acoustics performances of subsystems as a critical input for the selection of a specific design. Among this market, rotating systems noise takes a growing importance and automotive alternators are strongly impacted by this aspect. Alternators contain many different types of rotating parts such as cooling fans and claw poles and their corresponding flow-induced noise contributions and interaction mechanisms driving the noise generation have to be assessed as early as possible in the product development process. Experimental methods have been historically used to identify and reduce the most obvious phenomena at the origin of the broadband and tonal contents of the noise. Considering the complexity of this device, it appears practically more and more difficult to understand the involved mechanisms and to identify and treat the remaining aeroacoustics sources. The use of digital solutions to simulate the corresponding flow-induced noise contributions and to provide an insight on the noise generation mechanisms represents an alternative to this experimental approach. Furthermore, numerical approach allows a broader design space exploration, where experimental testing can sometime be limited by other constraints, such as mechanical, thermal and electromagnetic aspects. Another advantage of using CAE method is to reduce the product development cycle and the number of expensive prototypes. The highly detailed geometry features and the constrained environment of alternators however represented a real challenge for computational aeroacoustics solutions. In this paper, an unsteady and compressible computational approach based on the Lattice Boltzmann Method (LBM) is used to simultaneously predict the 3-D turbulent flow and the corresponding acoustic field of an automotive alternator. The complete rotor-stator model including all geometrical details and the truly rotating geometry is simulated. Numerical and experimental far field sound pressure levels and acoustic power comparisons are presented. Additional transient and spectral flow analysis are performed to diagnose flow-induced noise problems and to provide a better understanding of the aeroacoustics sources.

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