Optimization of regularized B-spline smoothing for turbulent Lagrangian trajectories

Cheminet Adam; Ostovan Yasar; Valori Valentina; Cuvier Christophe; Daviaud Fancois; Debue Paul; Dubrulle Berengere; Foucaut Jean-Marc; Laval Jean-Philippe

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Optimization of regularized B-spline smoothing for turbulent Lagrangian trajectories

机译：湍流拉格朗日轨迹正规化B样条平滑的优化

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The denoising of Lagrangian trajectories based on regularized B-spline is investigated. The aim is to find systematic criteria for optimization of algorithms used in 4D-PTV in order to optimize the quality of 4D-PTV measurements of turbulent flows as well as high-order of turbulence statistics. We introduce and adapt to this context two innovative tuning strategies which are commonly used in the Tikhonov regularization of inverse problems based on L-curve shape and Normalized Cumulative Periodogram (NCP). The corresponding strategies are tested on synthetic Lagrangian trajectories computed from Direct Numerical Simulation with additional white Gaussian noise. Error-based quantities like Signal-to-Noise Ratio as well as statistical Lagrangian quantities are investigated to compare the different strategies. We then apply the algorithm to experimental data from a 4DPTV Lagrangian measurements in a turbulent Von K & acute;arm & acute;an flow. We show the ability of those strategies to optimize the quality of the signal compared to conventional methods. Moreover, the strategies are more adaptable to real experimental noise.

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《Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics》 |2021年第1期|共16页
作者
Cheminet Adam; Ostovan Yasar; Valori Valentina; Cuvier Christophe; Daviaud Fancois; Debue Paul; Dubrulle Berengere; Foucaut Jean-Marc; Laval Jean-Philippe;
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作者单位

Univ Lille Arts &

Metiers Inst Technol LMFL Lab Mecan Fluides Lille Kampe Feriet UMR 9014 CNRS ONERA Cent Lille F-59000 Lille France;

Univ Lille Arts &

Metiers Inst Technol LMFL Lab Mecan Fluides Lille Kampe Feriet UMR 9014 CNRS ONERA Cent Lille F-59000 Lille France;

Univ Paris Saclay CEA Saclay CEA SPEC CNRS UMR 3680 Gif Sur Yvette France;

Univ Lille Arts &

Metiers Inst Technol LMFL Lab Mecan Fluides Lille Kampe Feriet UMR 9014 CNRS ONERA Cent Lille F-59000 Lille France;

Univ Paris Saclay CEA Saclay CEA SPEC CNRS UMR 3680 Gif Sur Yvette France;

Univ Paris Saclay CEA Saclay CEA SPEC CNRS UMR 3680 Gif Sur Yvette France;

Univ Paris Saclay CEA Saclay CEA SPEC CNRS UMR 3680 Gif Sur Yvette France;

Univ Lille Arts &

Metiers Inst Technol LMFL Lab Mecan Fluides Lille Kampe Feriet UMR 9014 CNRS ONERA Cent Lille F-59000 Lille France;

Univ Lille Arts &

Metiers Inst Technol LMFL Lab Mecan Fluides Lille Kampe Feriet UMR 9014 CNRS ONERA Cent Lille F-59000 Lille France;

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原文格式 PDF
正文语种 eng
中图分类流体力学;
关键词
Turbulence; Lagrangian measurements; Signal processing; Denoising techniques; Regularized B-splines;

机译：湍流;拉格朗日测量;信号处理;去噪技术;正规化的B样条;

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Optimization of regularized B-spline smoothing for turbulent Lagrangian trajectories

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