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Experiments in Fluids

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01-07-2023 | Research Article

Density field reconstruction from time-series schlieren images via extended phase-consistent dynamic mode decomposition

Authors: Tsuyoshi Shigeta, Takayuki Nagata, Taku Nonomura

Published in: Experiments in Fluids | Issue 7/2023

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Abstract

The extended phase-consistent dynamic mode decomposition (DMD) method, which reconstructs density fields from density gradient fields in multiple directions, was developed and applied to schlieren images in the low-density wind tunnel tests. Schlieren images were acquired in the Re = 3000, 10,000, and M = 0.15, 0.50 flows around a triangular airfoil, and the density gradient fields were calculated from the calibration of the optical system. The proposed density field reconstruction method adopts the extended phase-consistent DMD principle for the estimation of the DMD modes of the density field. The density field was reconstructed with good accuracy in a numerical simulation for comparison, and the density fluctuation region caused by vortex shedding around a triangular airfoil was visualized by the experimental data.

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Title: Density field reconstruction from time-series schlieren images via extended phase-consistent dynamic mode decomposition
Authors: Tsuyoshi Shigeta
Takayuki Nagata
Taku Nonomura
Publication date: 01-07-2023
Publisher: Springer Berlin Heidelberg
Published in: Experiments in Fluids / Issue 7/2023
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-023-03668-x

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