Subgrid scale formulation of optical flow for the study of turbulent flow

被引：36

作者：

Cassisa, C. ^{[1
]}

Simoens, S. ^{[2
]}

Prinet, V. ^{[3
]}

Shao, L. ^{[2
]}

机构：

[1] Tsinghua Univ, Lab Turbulence, Beijing 100084, Peoples R China

[2] Ecole Cent Lyon, CNRS, Lab Fluid Mech & Acoust, UMR 5509, Ecully, France

[3] Chinese Acad Sci, Natl Lab Pattern Recognit, Inst Automat, Beijing, Peoples R China

来源：

EXPERIMENTS IN FLUIDS | 2011年 / 51卷 / 06期

关键词：

IMAGING VELOCIMETRY MEASUREMENTS; GRADIENT TENSOR FIELD; ROBUST ESTIMATION; BOUNDARY-LAYER; VARIABLE WIDTH; STREET CANYON; COMPUTATION; DISPERSION; SIMULATION;

D O I：

10.1007/s00348-011-1180-5

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

We propose a new formulation of optical flow in the case of passive scalar or solid particles spreading in turbulent flows. The flow equation is defined from the scalar transport equation and a decomposition of our physical quantities (velocity and concentration fields) into two contributions, large and small scales, to account for the lack of spatial resolution in processed images. A subgrid scale model is introduced to model the small scale contribution. Comparisons are made with existing optical flow methods and Particle Image Velocimetry on synthetic and real sequences. The improvement of the estimation of velocity field by the proposed formulation is discussed in the case of a scalar turbulent propagation.

引用

页码：1739 / 1754

页数：16

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