TY - GEN
T1 - Aeroacoustic simulation of a cross-flow fan using lattice Boltzmann method with a RANS model
AU - Kusano, Kazuya
AU - Furukawa, Masato
AU - Sakoda, Kenichi
AU - Fukui, Tomoya
N1 - Funding Information:
This work was supported by JSPS KAKENHI (Grant Number JP20K22397). Computational resources were provided by the Research Institute for Information Technology, Kyushu University.
Publisher Copyright:
© INTER-NOISE 2021 .All right reserved.
PY - 2021
Y1 - 2021
N2 - In this study, we developed an unsteady RANS approach based on the lattice Boltzmann method (LBM) to perform direct aeroacoustic simulations of low-speed fans at a lower computational cost compared with the conventional LBM-LES approach. In this method, the k-ω turbulence model is incorporated into the LBM flow solver, and the transport equations of k and ω are computed using the LBM, similar to the Navier-Stokes equations. In addition, moving boundaries, such as fan rotors, are considered using a direct-forcing immersed boundary method. This numerical method was validated through a two-dimensional simulation of a cross-flow fan. The simulation was able to capture an eccentric vortex structure in the rotor, and a pressure rise due to the work of the rotor could be reproduced. In addition, the peak sound of the blade-passing frequency was successfully predicted by the present method. Furthermore, the simulation results showed that the peak sound is generated by the interaction between the rotor blade and the flow around the tongue part of the casing.
AB - In this study, we developed an unsteady RANS approach based on the lattice Boltzmann method (LBM) to perform direct aeroacoustic simulations of low-speed fans at a lower computational cost compared with the conventional LBM-LES approach. In this method, the k-ω turbulence model is incorporated into the LBM flow solver, and the transport equations of k and ω are computed using the LBM, similar to the Navier-Stokes equations. In addition, moving boundaries, such as fan rotors, are considered using a direct-forcing immersed boundary method. This numerical method was validated through a two-dimensional simulation of a cross-flow fan. The simulation was able to capture an eccentric vortex structure in the rotor, and a pressure rise due to the work of the rotor could be reproduced. In addition, the peak sound of the blade-passing frequency was successfully predicted by the present method. Furthermore, the simulation results showed that the peak sound is generated by the interaction between the rotor blade and the flow around the tongue part of the casing.
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U2 - 10.3397/IN-2021-1578
DO - 10.3397/IN-2021-1578
M3 - Conference contribution
AN - SCOPUS:85117381808
T3 - Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering
BT - Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering
A2 - Dare, Tyler
A2 - Bolton, Stuart
A2 - Davies, Patricia
A2 - Xue, Yutong
A2 - Ebbitt, Gordon
PB - The Institute of Noise Control Engineering of the USA, Inc.
T2 - 50th International Congress and Exposition of Noise Control Engineering, INTER-NOISE 2021
Y2 - 1 August 2021 through 5 August 2021
ER -