Influence of incident vortex street on separated flow around a finite blunt plate: PIV measurement and POD analysis

Zhang, Qingshan; Liu, Yingzheng

doi:10.1016/j.jfluidstructs.2015.03.017

Cited by 26 publications

(6 citation statements)

References 22 publications

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“…However, mode 7 (or 8) displays a smaller scale structure compared to mode 5 (or 6), and mode 5 (or 6) has an up-down symmetric structure along the flow direction, whereas mode 7 (or 8) exhibits an up-down anti-symmetrical structure. The present POD mode structures are rationally consistent with those in the literature [27], which demonstrates the reliability of the snapshot POD algorithm implemented in this study. Table 2.…”

Section: Validation Of the Snapshot Pod Algorithmsupporting

confidence: 89%

Investigation of the Influence of Wake Field Characteristic Structures on Downstream Targets Using the POD Method

Fu,

Wang,

et al. 2023

Aerospace

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This research investigated the impact of complex low-speed wake flow structures on the aerodynamic characteristics of objects downstream. It employed the proper orthogonal decomposition (POD) method and the domain precursor simulation method to compare traditional methods and validate this approach. The study generated several flow structures of parallel dual-cylinder wakes with different scales and spacing. The variations in the aerodynamic coefficient of three downstream objects at various times passing through wakes of varying scales were appropriately compared and analyzed. The study established that the wake with a cylinder spacing of G = 1.5 has a more compact and concentrated modal structure than that with a cylinder spacing of G = 0.35. Smaller objects were more responsive to the wake flow structure with a spacing of G = 1.5, whereas larger objects responded more to the flow structure with a spacing of G = 0.35. The achieved results also revealed that the aerodynamic force coefficients of objects passing through the wakefield at different times were closely related to the temporal characteristics of the wake flow structure with different scales.

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Section: Validation Of the Snapshot Pod Algorithmsupporting

confidence: 89%

Investigation of the Influence of Wake Field Characteristic Structures on Downstream Targets Using the POD Method

Fu,

Wang,

et al. 2023

Aerospace

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“…For plates of square leading and trailing edges, Stokes and Welsh (1986) [3] have summarized the results obtained by Parker and Welsh (1983) [4] and defined four different vortex shedding regimes depending on the ratio c/D. These regimes were confirmed by Shi et al( 2010) [5] and by Zhang et al (2015) [6] for flat plates with c/D ranging from 1 to 9 at a thickness-based Reynolds numbers Re D = 1 × 10 3 . For short plates ( c/D < 3.2), the flow separation occurs at the leading-edge corner and there is a direct interaction of the shear layer to generate a regular vortex street in the wake.…”

Section: Introductionmentioning

confidence: 64%

Vortex-induced vibrations of a cantilevered blunt plate: POD of TR-PIV measurements and structural modal analysis

Watine

Gabillet

Lossouarn

et al. 2023

Journal of Fluids and Structures

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“…Zhang et al [11] conducted a comprehensive comparison on the identification of multi-dominant vortical structures in the real wake flows behind a single cylinder and two side-by-side cylinders of different diameters by applying the POD and DMD algorithms into their high-repetition time-resolved particle image velocimetry (TR-PIV) data. Besides, Zhang and Liu [12] used POD to efficiently extract the energetic coherent structures by spatially filtering the small-scale background noise from their planar PIV data of the separated shear layers around finite blunt plates. Actually, since the year 2000, the POD filtering function has already been concluded as a very effective scale-decomposition in inhomogeneous turbulent flows [13].…”

Section: B Proper Orthogonal Decompositionmentioning

confidence: 99%

POD-Based Data Mining of Turbulent Flows in Front of and on Top of Smooth and Roughness-Resolved Forward-Facing Steps

et al. 2019

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A new application of proper orthogonal decomposition (POD) to uncover the relation of the instantaneous energetic large-scale turbulent structures to the dominant POD modes had been reported. Motivated on this method, the data mining from the velocity vector fields measured by the particle image velocimetry and structural analysis on the selected POD-based reconstructed turbulent flows in front of and on top of smooth and roughness-resolved forward-facing steps (FFSs) has been performed. The velocity fields containing the most energetic large-scale structures are conditionally chosen. The conditional criterion is that the chosen velocity fields whose POD temporal coefficients of the first or second mode are correspondingly larger than twice of their root mean square values. Typically, the most energetic instantaneous structures are the large-scale second-quadrant (Q2) or fourth-quadrant (Q4) events and the mostly open separation bubbles in front of these FFSs; while the large-scale structures behave as a strong shear layer, and near or in which are a few spanwise prograde or retrograde vortices; and sometimes the alternating node and saddle points appeared. Similarly, for the flow on top of the FFSs, the most energetic structures are presented as a great many large-scale Q4 or Q2 events and a few secondary vortices at the very near wall; while the large-scale structures are overall exhibited as a strong shear layer, and in which a large number of vertex structures are created. These energetic large-scale structures here are not only sensitive to the surface roughness conditions but also to the spanwise locations.

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Influence of incident vortex street on separated flow around a finite blunt plate: PIV measurement and POD analysis

Cited by 26 publications

References 22 publications

Investigation of the Influence of Wake Field Characteristic Structures on Downstream Targets Using the POD Method

Investigation of the Influence of Wake Field Characteristic Structures on Downstream Targets Using the POD Method

Vortex-induced vibrations of a cantilevered blunt plate: POD of TR-PIV measurements and structural modal analysis

POD-Based Data Mining of Turbulent Flows in Front of and on Top of Smooth and Roughness-Resolved Forward-Facing Steps

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