{"title":"基于阻抗边界条件的低速吸声风扇晶格玻尔兹曼模拟","authors":"Atsushi Imada , Kazuya Kusano , Kenichi Sakoda , Kisho Hatakenaka , Masato Furukawa","doi":"10.1016/j.jsv.2025.119066","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigated the feasibility of using impedance-based modeling in the lattice Boltzmann method (LBM) to simulate the flow and acoustic fields around low-speed fans equipped with sound absorbers. A boundary condition based on the bounce-back method was employed to integrate the impedance model into the LBM simulations, enabling easy application to complex geometries. Initially, the impedance boundary condition based on the bounce-back method was validated using the NASA Langley impedance tube. The simulation results demonstrated good agreement with both the experimental data and conventional LBM simulations, confirming the effectiveness of the bounce-back method for implementing the impedance boundary condition. Subsequently, this method was applied to aeroacoustic simulations of a cross-flow fan equipped with resonators and glass wool. The resonance frequencies of the resonators were tuned to match the blade-passing frequency of the fan, and the impedance characteristics of the sound absorbers were measured using an acoustic impedance tube. The results revealed that overfitting the impedance model to the low-frequency characteristics generated unphysical vortices at the boundaries. In contrast, proper fitting successfully simulated the sound absorption effects of the resonators and glass wool in the aeroacoustic simulations of the cross-flow fan.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"608 ","pages":"Article 119066"},"PeriodicalIF":4.3000,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Lattice Boltzmann simulation of low-speed fans with sound absorbers using impedance boundary condition\",\"authors\":\"Atsushi Imada , Kazuya Kusano , Kenichi Sakoda , Kisho Hatakenaka , Masato Furukawa\",\"doi\":\"10.1016/j.jsv.2025.119066\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study investigated the feasibility of using impedance-based modeling in the lattice Boltzmann method (LBM) to simulate the flow and acoustic fields around low-speed fans equipped with sound absorbers. A boundary condition based on the bounce-back method was employed to integrate the impedance model into the LBM simulations, enabling easy application to complex geometries. Initially, the impedance boundary condition based on the bounce-back method was validated using the NASA Langley impedance tube. The simulation results demonstrated good agreement with both the experimental data and conventional LBM simulations, confirming the effectiveness of the bounce-back method for implementing the impedance boundary condition. Subsequently, this method was applied to aeroacoustic simulations of a cross-flow fan equipped with resonators and glass wool. The resonance frequencies of the resonators were tuned to match the blade-passing frequency of the fan, and the impedance characteristics of the sound absorbers were measured using an acoustic impedance tube. The results revealed that overfitting the impedance model to the low-frequency characteristics generated unphysical vortices at the boundaries. In contrast, proper fitting successfully simulated the sound absorption effects of the resonators and glass wool in the aeroacoustic simulations of the cross-flow fan.</div></div>\",\"PeriodicalId\":17233,\"journal\":{\"name\":\"Journal of Sound and Vibration\",\"volume\":\"608 \",\"pages\":\"Article 119066\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2025-03-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Sound and Vibration\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022460X25001403\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ACOUSTICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Sound and Vibration","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022460X25001403","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ACOUSTICS","Score":null,"Total":0}
Lattice Boltzmann simulation of low-speed fans with sound absorbers using impedance boundary condition
This study investigated the feasibility of using impedance-based modeling in the lattice Boltzmann method (LBM) to simulate the flow and acoustic fields around low-speed fans equipped with sound absorbers. A boundary condition based on the bounce-back method was employed to integrate the impedance model into the LBM simulations, enabling easy application to complex geometries. Initially, the impedance boundary condition based on the bounce-back method was validated using the NASA Langley impedance tube. The simulation results demonstrated good agreement with both the experimental data and conventional LBM simulations, confirming the effectiveness of the bounce-back method for implementing the impedance boundary condition. Subsequently, this method was applied to aeroacoustic simulations of a cross-flow fan equipped with resonators and glass wool. The resonance frequencies of the resonators were tuned to match the blade-passing frequency of the fan, and the impedance characteristics of the sound absorbers were measured using an acoustic impedance tube. The results revealed that overfitting the impedance model to the low-frequency characteristics generated unphysical vortices at the boundaries. In contrast, proper fitting successfully simulated the sound absorption effects of the resonators and glass wool in the aeroacoustic simulations of the cross-flow fan.
期刊介绍:
The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application.
JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.