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RISS 인기검색어
- 검색키워드
- 저자 : Shice Yu (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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The loss coefficient for fluctuating flow through a dominant opening in a building
Haiwei Xu,Shice Yu,Wenjuan Lou 한국풍공학회 2017 Wind and Structures, An International Journal (WAS Vol.24 No.1
Wind-induced fluctuating internal pressures in a building with a dominant opening can be described by a second-order non-linear differential equation. However, the accuracy and efficiency of the governing equation in predicting internal pressure fluctuations depend upon two ill-defined parameters: inertial coefficient CI and loss coefficient CL, since CI determines the un-damped oscillation frequency of an air slug at the opening, while CL controls the decay ratio of the fluctuating internal pressure. This study particularly focused on the value of loss coefficient and its influence factors including: opening configuration and location, internal volumes, as well as wind speed and approaching flow turbulence. A simplified formula was presented to predict loss coefficient, therefore an approximate relationship between the standard deviation of internal and external pressures can be estimated using Vickery\'s approach. The study shows that the loss coefficient governs the peak response of the internal pressure spectrum which, in turn, will directly influence the standard deviation of the fluctuating internal pressure. The approaching flow characteristic and opening location have a remarkable effect on the parameter CL.
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The loss coefficient for fluctuating flow through a dominant opening in a building
Xu, Haiwei,Yu, Shice,Lou, Wenjuan Techno-Press 2017 Wind and Structures, An International Journal (WAS Vol.24 No.1
Wind-induced fluctuating internal pressures in a building with a dominant opening can be described by a second-order non-linear differential equation. However, the accuracy and efficiency of the governing equation in predicting internal pressure fluctuations depend upon two ill-defined parameters: inertial coefficient $C_I$ and loss coefficient $C_L$, since $C_I$ determines the un-damped oscillation frequency of an air slug at the opening, while $C_L$ controls the decay ratio of the fluctuating internal pressure. This study particularly focused on the value of loss coefficient and its influence factors including: opening configuration and location, internal volumes, as well as wind speed and approaching flow turbulence. A simplified formula was presented to predict loss coefficient, therefore an approximate relationship between the standard deviation of internal and external pressures can be estimated using Vickery's approach. The study shows that the loss coefficient governs the peak response of the internal pressure spectrum which, in turn, will directly influence the standard deviation of the fluctuating internal pressure. The approaching flow characteristic and opening location have a remarkable effect on the parameter $C_L$.
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The inertial coefficient for fluctuating flow through a dominant opening in a building
Haiwei Xu,Shice Yu,Wenjuan Lou 한국풍공학회 2014 한국풍공학회지 Vol.18 No.1
For a building with a dominant windward wall opening, the wind-induced internal pressureresponse can be described by a second-order non-linear differential equation. However, there are twoill-defined parameters in the governing equation: the inertial coefficient CI and the loss coefficient CL. Lack of knowledge of these two parameters restricts the practical use of the governing equation. This studywas primarily focused on finding an accurate reference value for CI, and the paper presents a systematicinvestigation of the factors influencing the inertial coefficient for a wind-tunnel model building including:opening configuration and location, wind speed and direction, approaching flow turbulence, the modelmaterial, and the installation method. A numerical model was used to simulate the volume deformationunder internal pressure, and to predict the bulk modulus of an experimental model. In considering thestructural flexibility, an alternative approach was proposed to ensure accurate internal volume distortions, sothat similarity of internal pressure responses between model-scale and full-scale building was maintained. The research showed 0.8 to be a reasonable standard value for the inertial coefficient.
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The inertial coefficient for fluctuating flow through a dominant opening in a building
Xu, Haiwei,Yu, Shice,Lou, Wenjuan Techno-Press 2014 Wind and Structures, An International Journal (WAS Vol.18 No.1
For a building with a dominant windward wall opening, the wind-induced internal pressure response can be described by a second-order non-linear differential equation. However, there are two ill-defined parameters in the governing equation: the inertial coefficient $C_I$ and the loss coefficient $C_L$. Lack of knowledge of these two parameters restricts the practical use of the governing equation. This study was primarily focused on finding an accurate reference value for $C_I$, and the paper presents a systematic investigation of the factors influencing the inertial coefficient for a wind-tunnel model building including: opening configuration and location, wind speed and direction, approaching flow turbulence, the model material, and the installation method. A numerical model was used to simulate the volume deformation under internal pressure, and to predict the bulk modulus of an experimental model. In considering the structural flexibility, an alternative approach was proposed to ensure accurate internal volume distortions, so that similarity of internal pressure responses between model-scale and full-scale building was maintained. The research showed 0.8 to be a reasonable standard value for the inertial coefficient.
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