Anslysis of Kinetic Energy Dissipation Rate and POD Reconstruction of a Channel Flow

doi:10.19596/j.cnki.1001-246x.7619

Abstract

Abstract: Vortex wave flow field within a channel was measured using particle image velocimetry (2DPIV). Instantaneous velocity vector field measured was reconstructed with dominant modes using POD technology. Average velocity and turbulent kinetic energy distribution were obtained using POD reconstructed field. Turbulent kinetic energy dissipation rate was estimated by using a large eddy PIV method. It shows that dominated structure of original flow field were characterized by reconstruction of flow field. Noise and other interference information were eliminated. Large eddy PIV method estimates effectively distribution of kinetic energy dissipation rate. Turbulent kinetic energy is small in vicinity of wall. Turbulent kinetic energy increases near center of channel region, which is characteristics of jet. Kinetic energy dissipation rate peak appears in vicinity of central region and channel wall. Away from wall kinetic energy dissipation rate is increases initially, and decreased gradually until it reaches a peak.

Key words: channel, vortex wave flow field, 2DPIV measurement, POD reconstruction, kinetic energy dissipation rate

CLC Number:

O357.5

CHEN Bin, LIU Ge. Anslysis of Kinetic Energy Dissipation Rate and POD Reconstruction of a Channel Flow[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2018, 35(2): 169-177.

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