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Spatial relation between fluctuating wall pressure and near-wall streamwise vortices in wall bounded turbulent flow
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作者 Mingwei GE Yingtao ZUO +1 位作者 Ying DENG Yuhua LI 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2015年第6期719-728,共10页
A new view of the spatial relation between fluctuating wall pressure and near-wall streamwise vortices (NWSV) is proposed for wall bounded turbulent flow by use of the direct numerical simulation (DNS) database. T... A new view of the spatial relation between fluctuating wall pressure and near-wall streamwise vortices (NWSV) is proposed for wall bounded turbulent flow by use of the direct numerical simulation (DNS) database. The results show that the wall region with low pressure forms just below the strong NWSV, which is mostly associated with the overhead NWSV. The wall region with high pressure forms downstream of the NWSV, which has a good correspondence with the downwash of the fluids induced by the upstream NWSV. The results provide a significant basis for the detection of NWSV. 展开更多
关键词 conditional correlation fluctuating wall pressure streamwise vortices
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SIMULTANEOUS FLOW VISUALIZATION AND WALL-PRESSURE MEASUR EMENT OF THE TURBULENT SEPARATED AND REATTACHING FLOW OVER A BACKWARD-FACING STEP 被引量:3
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作者 KE Feng LIU Ying-zheng +1 位作者 CHEN Han-ping HIDE S.Koyama 《Journal of Hydrodynamics》 SCIE EI CSCD 2007年第2期180-187,共8页
Unsteady behaviors of the large-scale vortical structure superimposed in the turbulent separated and reattaching flow over a backward-facing step were convincingly delineated by performing simultaneous measurements of... Unsteady behaviors of the large-scale vortical structure superimposed in the turbulent separated and reattaching flow over a backward-facing step were convincingly delineated by performing simultaneous measurements of the wall pressure fluctuations and visualizations of the flow. Toward this end, a synchronized instrumentation system integrated with the microphone array and the high-speed camera was established. The smoke-wire technique was employed to visualize the unsteady events. A thorough analysis based on the wall pressure fluctuations disclosed that the large-scale vortical structure shedding at the frequency of fH/Uo = 0.064 gave a primary contribution to the wall pressure fluctuations, and consequently dominated unsteady behaviors of the turbulent shear layer. The convection velocity of the large-scale vortical structure was determined as Uc =0.55 U0. The instantaneous flow visualizations and wall pressure were compared in a straightforward manner. Below the separation bubble and the reattachment zone, the negative peak of the time-varying wall pressure was in phase with passage of the local large-scale vortical structure. In the redeveloping turbulent boundary layer, the decaying large-scale vortical structure was clearly revealed. 展开更多
关键词 backward-facing step large-scale vorticalstructure VISUALIZATION wall pressure fluctuations
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PRESSURE-VELOCITY JOINT MEASUREMENTS OF A WALL-BOUNDED TURBULENT SHEAR FLOW 被引量:1
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作者 LIU Ying-zheng KE Feng WANG Wei-zhe CAO Zhao-min 《Journal of Hydrodynamics》 SCIE EI CSCD 2006年第3期315-318,共4页
The unsteady behavior of the large-scale vortical structures buried in a wall-bounded turbulent shear layer flow was extensively investigated using pressure-velocity joint measurements. The wall pressure fluctuations ... The unsteady behavior of the large-scale vortical structures buried in a wall-bounded turbulent shear layer flow was extensively investigated using pressure-velocity joint measurements. The wall pressure fluctuations and flow field velocity fluctuations were measured simultaneously by using a microphone and an X-type hotwire, respectively. The spatially and temporally strong coupling between the convecting flow structures and the wall pressure fluctuations were meticulously investigated in terms of the continuous wavelet transform, cross-correlation and coherence of the wall pressure and flow field. The characteristics of the large-scale vortical structures, e.g., the shedding frequency, averaged convection velocity, convective motion, and structure pattern were revealed. 展开更多
关键词 turbulent shear layer large-scale vortical structure wall pressure fluctuations
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WALL PRESSURE FLUCTUATIONS OF TURBULENT FLOW OVER BACKWARD-FACING STEP WITH AND WITHOUT ENTRAINMENT: MICROPHONE ARRAY MEASUREMENT 被引量:1
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作者 KE Feng LIU Ying-zheng WANG Wei-zhe CHEN Han-ping 《Journal of Hydrodynamics》 SCIE EI CSCD 2006年第4期393-396,共4页
Wall pressure fluctuations in turbulent boundary layer flow over backward-facing step with and without entrainment were investigated. Digital array pressure sensors and multi-arrayed microphones were employed to acqui... Wall pressure fluctuations in turbulent boundary layer flow over backward-facing step with and without entrainment were investigated. Digital array pressure sensors and multi-arrayed microphones were employed to acquire the time-averaged static pressure and fluctuating pressure, respectively. The differences of two flows were scrutinized in terms of static pressure characteristics, pressure fluctuations, cross-correlation and coherence of wall pressure. Introduction of the entrainment increased scale of large-scale vortical structure and reduced its convection velocity. However, shedding frequency of large-scale vortical structures was found to be the same for both flows. 展开更多
关键词 backward-facing step turbulent boundary layer ENTRAINMENT wall pressure fluctuations Microphone Array
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MECHANISM OF WALL PRESSURE FLUCTUATIONS BENEATH THE OPEN CHANNEL FLOW 被引量:1
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作者 ZHAO YAONAN, Tianjin University 《Journal of Hydrodynamics》 SCIE EI CSCD 1989年第1期52-60,共9页
Based on the measured results that wall pressure fluctuations are mainly de- cided by coherent structures of turbulence, the relationship between root-mean- square wall pressure and wall shear stress in turbulent shea... Based on the measured results that wall pressure fluctuations are mainly de- cided by coherent structures of turbulence, the relationship between root-mean- square wall pressure and wall shear stress in turbulent shear flow and that between the intensities of pressure and fluctuating velocity in homogeneous and isotropic turbulence are established in this paper. These relationships are consistent with former works, and have good agreement with experimental data. The paper also dis- cusses the concept of 'apparent pressure' on the wall in mean flow. 展开更多
关键词 MECHANISM OF wall pressure FLUCTUATIONS BENEATH THE OPEN CHANNEL FLOW
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PROPER ORTHOGONAL DECOMPOSITION AND LOW-DIMENSIONAL APPROXIMATION OF WALL PRESSURE FLUCTUATION
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作者 LIUShi-he DUANHong-dong LUJing 《Journal of Hydrodynamics》 SCIE EI CSCD 2004年第6期669-674,共6页
Wall pressure fluctuation is one of the source terms which result in thevibration of hydraulic structures. To consider both the space and time correlation of the pressurefield. the method of proper orthogonal decompos... Wall pressure fluctuation is one of the source terms which result in thevibration of hydraulic structures. To consider both the space and time correlation of the pressurefield. the method of proper orthogonal decomposition and low-dimensional approximation were usedhere to describe the pressure signals of the turbulent boundary layer, the apron of the stillingpond and the vertically impinging jet. 展开更多
关键词 wall pressure fluctuation TURBULENCE
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EFFECT OF CIRCULAR TRANSDUCER SIZE ON WALL PRESSURE FLUCTUATION SIGNAL
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作者 Liu Shi-he(Wuhan University of hydraulic and Electric Engineering, wuhan, 430072, P. R. China) ) 《Journal of Hydrodynamics》 SCIE EI CSCD 1994年第2期32-39,共8页
In this paper theoretical wall pressure fluctuation spectrum calculated by Rapid Distortion Theory was used to predict the effect of circular transducer size on the measured statistical properties of wall pressure flu... In this paper theoretical wall pressure fluctuation spectrum calculated by Rapid Distortion Theory was used to predict the effect of circular transducer size on the measured statistical properties of wall pressure fluctuation signals. It was found that the measured onedimensional spectrum has a significant decreaSe at hish wave numbers due to attenuation by the finite size of the transducer, and wall pressure fluctuahon intensity decreases with the increase of the transducer size. 展开更多
关键词 circular transducer wall pressure fluctuation
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超声速流边界层中的壁面正、负压力脉动
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作者 尹琰鑫 吴勇军 +4 位作者 王润 任冲 屈强 张青青 刘晋 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2023年第2期114-125,共12页
本文对来流马赫数2.25、基于动量厚度的雷诺数4000的平板湍流边界层开展了直接数值模拟,通过聚类连通法和条件相关研究了壁面正、负压力脉动.负脉动比正脉动的特征长度小,但是二者特征时间接近.正脉动的对流速度略大.壁面压力脉动结构... 本文对来流马赫数2.25、基于动量厚度的雷诺数4000的平板湍流边界层开展了直接数值模拟,通过聚类连通法和条件相关研究了壁面正、负压力脉动.负脉动比正脉动的特征长度小,但是二者特征时间接近.正脉动的对流速度略大.壁面压力脉动结构的空间距离是自相似的,即空间距离与特征长度成正比.同类壁面压力结构在展向成串出现,正、负壁面压力脉动在流向成对。流向壁面剪切脉动大致在壁面压力脉动的下游,而展向壁面剪切脉动则与壁面压力脉动成对角线方式分布,二者的相关函数成“四极子”形式,其中壁面压力脉动与其上游的展向壁面剪切相关系数大于下游. 展开更多
关键词 Supersonic turbulent boundary layer wall pressure fluctuation Negative and positive events
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EXPERIMENTAL STUDY OF UNSTEADY CHARACTERISTICS OF TURBULENT MIXING LAYER FLOW OVER AN OPEN STEP AND A SQUARE-EDGED RIB
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作者 KE Feng Chen Han-ping +5 位作者 Liu Ying-zheng He You-sheng Wu Ming-lan Zhou Lian-di Tao Ming-de Liu Yu-lu 《Journal of Hydrodynamics》 SCIE EI CSCD 2007年第6期786-786,共1页
Spatio-temporal characteristics of the wall-bounded turbulent mixing layer flow over an open step and a square-edged rib were extensively studied in a low-speed wind tunnel. Simultaneous measurements of wall-pressure ... Spatio-temporal characteristics of the wall-bounded turbulent mixing layer flow over an open step and a square-edged rib were extensively studied in a low-speed wind tunnel. Simultaneous measurements of wall-pressure fluctuations and velocity measurements were performed by using microphone array and X-wire/split fim, respectively. 展开更多
关键词 ENTRAINMENT turbulent flow UNSTEADY wall pressure fluctuations large-scale vortical structures
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