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Keywords: POD
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Proceedings Papers

Proc. ASME. FEDSM2020, Volume 2: Fluid Mechanics; Multiphase Flows, V002T03A050, July 13–15, 2020
Paper No: FEDSM2020-20226
.... Keywords: Vortex-induced vibrations, modal decomposition, TR-PIV. POD, Modal Analysis NOMENCLATURE B plate span (mm) C plate chord (mm) D plate thickness (mm) f2 twisting mode frequency (Hz) fs structural response frequency (Hz) fvs vortex shedding frequency (Hz) fw main wake frequency (Hz) Re Reynolds...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A082, July 28–August 1, 2019
Paper No: AJKFluids2019-4651
... of the cylindrical configuration and due to the confinement, PIV measurements in the range of 40 < Re < 200 clearly show that the von Karman vortex shedding appears at a critical Reynolds number which is about 66. A post-processing of these PIV measurements using the Proper Orthogonal Decomposition (POD...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 4: Fluid Measurement and Instrumentation; Micro and Nano Fluid Dynamics, V004T04A018, July 28–August 1, 2019
Paper No: AJKFluids2019-5058
... been filled with water up to 85% level of the tank height. The agitator has been rotated with 200rpm, 250rpm and 300rpm, and the 3D flow structures have been captured by the constructed SPIV system. Using measured instantaneous 3D vectors, POD (proper orthogonal decomposition) analyses has been...
Proceedings Papers

Proc. ASME. FEDSM2013, Volume 1B, Symposia: Fluid Machinery; Fluid Power; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Flow Manipulation and Active Control: Theory, Experiments and Implementation; Fundamental Issues and Perspectives in Fluid Mechanics, V01BT15A006, July 7–11, 2013
Paper No: FEDSM2013-16309
... parameters. In the present study, we explore the efficiency of different vortex detection algorithms such as the vorticity ω , Γ 2 and Q criteria by studying the vortices structures in the wake of a confined square obstacle. Proper orthogonal decomposition (POD) of the velocity fields was used...
Proceedings Papers

Proc. ASME. FEDSM2010, ASME 2010 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise: Volume 3, Parts A and B, 223-232, August 1–5, 2010
Paper No: FEDSM-ICNMM2010-31183
... oscillation amplitude, rms and time-mean values of force coefficients revealed a shift toward lower amplitude with higher Re. Findings for the effect of frequency ratio are similar. Where vortex switches occurred, a pre- and post-jump analysis is carried out. POD analysis of the cylinder wake flow field...
Proceedings Papers

Proc. ASME. FEDSM2010, ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 2061-2069, August 1–5, 2010
Paper No: FEDSM-ICNMM2010-30548
... not occur through the traditional route as observed in circular cylinder flows. It is found that mode-C instability with a spanwise spacing of 2.4D dominates the near wake development. Wake instabilities Wake transition PLIF PIV POD 1 Copyright © 2010 ASME Proceedings of the ASME 2010 3rd...
Topics: Wakes
Proceedings Papers

Proc. ASME. FEDSM2009, Volume 1: Symposia, Parts A, B and C, 1389-1397, August 2–6, 2009
Paper No: FEDSM2009-78268
... 30 07 2010 An experimental investigation was performed to study the structure of the flow field around finite circular and square cylinders in a water channel. Detailed velocity measurements using a particle image velocimetry (PIV) system and proper orthogonal decomposition (POD...
Proceedings Papers

Proc. ASME. FEDSM2009, Volume 1: Symposia, Parts A, B and C, 1567-1576, August 2–6, 2009
Paper No: FEDSM2009-78137
... in the streamwise and spanwise vortices. Proper Orthogonal Decomposition (POD) is then used to identify changes in the near wake structure associated with coherent energy redistribution due to control. Integral properties such as the base drag and strength of the vortex shedding decrease compared to the base case...