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Title: On visualizing continuous turbulence scales
Authors: Liu, Xiaopei
Mishra, Maneesh
Skote, Martin
Fu, Chi-Wing
Keywords: Engineering::Mechanical engineering
Issue Date: 2019
Source: Liu, X., Mishra, M., Skote, M. & Fu, C. (2019). On visualizing continuous turbulence scales. Computer Graphics Forum, 38(1), 300-315.
Journal: Computer Graphics Forum
Abstract: Turbulent flows are multi-scale with vortices spanning a wide range of scales continuously. Due to such complexities, turbulence scales are particularly difficult to analyse and visualize. In this work, we present a novel and efficient optimization-based method for continuous-scale turbulence structure visualization with scale decomposition directly in the Kolmogorov energy spectrum. To achieve this, we first derive a new analytical objective function based on integration approximation. Using this new formulation, we can significantly improve the efficiency of the underlying optimization process and obtain the desired filter in the Kolmogorov energy spectrum for scale decomposition. More importantly, such a decomposition allows a ‘continuous-scale visualization’ that enables us to efficiently explore the decomposed turbulence scales and further analyse the turbulence structures in a continuous manner. With our approach, we can present scale visualizations of direct numerical simulation data sets continuously over the scale domain for both isotropic and boundary layer turbulent flows. Compared with previous works on multi-scale turbulence analysis and visualization, our method is highly flexible and efficient in generating scale decomposition and visualization results. The application of the proposed technique to both isotropic and boundary layer turbulence data sets verifies the capability of our technique to produce desirable scale visualization results.
ISSN: 0167-7055
DOI: 10.1111/cgf.13532
Rights: © 2018 The Authors. Computer Graphics Forum © 2018 The Eurographics Association and John Wiley & Sons Ltd. Published by John Wiley & Sons Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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