HIGH-FIDELITY LBM ANALYSIS OF INTERNAL FLOW STRUCTURES IN AN EXHAUST STACK SYSTEM WITH VARYING NUMBERS OF ACOUSTIC BAFFLES

D. Jeong; K.T. Park; C.J. Hong; J.S. Han; H.S. Yang; J.B. Kim; K.H. Moon; H. Lee

doi:10.6112/kscfe.2026.31.3.001

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2026 Vol.31, Issue 3 Next Page

Original Article

HIGH-FIDELITY LBM ANALYSIS OF INTERNAL FLOW STRUCTURES IN AN EXHAUST STACK SYSTEM WITH VARYING NUMBERS OF ACOUSTIC BAFFLES 소음 저감용 배플 개수 변화에 따른 배기 스택 시스템 내부 유동 특성에 관한 고정밀도 LBM 해석

30 September 2026. pp. 1-19

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Abstract

This study investigates the internal flow characteristics of an industrial exhaust stack as a preliminary step toward mitigating noise emissions from power generation and manufacturing facilities in urban environments. While previous research on silencer design has explored various flow-modifying devices, including baffles, vanes, and honeycomb structures, this work focuses on the aerodynamic effects of baffle number within the stack. Two configurations with different baffle counts, denoted B9 and B17, were examined to evaluate their influence on internal flow development, outlet flow propagation, and external dispersion behavior. In this study, very large eddy simulations (VLES) based on the lattice Boltzmann method (LBM) were conducted to resolve unsteady flow structures. In the B9 case, the reduced baffle density allowed for continuous flow development with minimal resistance, resulting in enhanced vertical momentum and strong upward propagation at the outlet. In contrast, the B17 configuration exhibited significant flow deceleration, restricted flow channels, and prominent recirculation zones between adjacent baffles. As a result, exhaust jet flow beyond 7 meters from the outlet was only observed in the B9 configuration. These findings demonstrate that the number of internal baffles critically influences the momentum transfer and far-field dispersion characteristics of exhaust stack flows, offering valuable insights for the aerodynamic optimization of noise control devices.

Keywords

배기 스택 시스템(Exhaust stack system)

소음 저감용 배플(Acoustic baffle)

유동 간섭(Flow interaction)

전산유체역학 (Computational fluid dynamics)

격자 볼츠만 법(Lattice-Boltzmann method)

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Information

Publisher :Korean Society for Computational Fluids Engineering
Publisher(Ko) :한국전산유체공학회
Journal Title :Journal of Computational Fluids Engineering
Journal Title(Ko) :한국전산유체공학회지
Volume : 31
No :3
Pages :1-19
Received Date : 2026-01-28
Revised Date : 2026-08-03
Accepted Date : 2026-09-11
DOI :https://doi.org/10.6112/kscfe.2026.31.3.001

Journal of Computational Fluids Engineering ISSN:1598-6071(Print) 3022-6252(Online) 한국전산유체공학회지

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