Cross-correlation in a turbulent flow: Analysis of the velocity field using the ρDCCA coefficient

被引：13

作者：

Brito, A. A. ^{[1
,5
]}

Rodrigues Santos, F. ^{[2
,5
]}

de Castro, A. P. N. ^{[3
]}

da Cunha Lima, A. T. ^{[4
,5
,6
]}

Zebende, G. F. ^{[7
,8
]}

da Cunha Lima, I. C. ^{[5
,6
,9
]}

机构：

[1] Fed Inst Bahia, Paulo Afonso, BA, Brazil

[2] Fed Inst Bahia, Camacari, BA, Brazil

[3] Unijorge Univ Ctr, Salvador, BA, Brazil

[4] Univ Fed Bahia, Salvador, BA, Brazil

[5] SENAI CIMATEC, Computat Modeling Program, Salvador, BA, Brazil

[6] INCT GP, Natl Inst Sci & Technol Petr Geophys, Salvador, BA, Brazil

[7] State Univ Feira de Santana, Dept Phys, Feira De Santana, BA, Brazil

[8] State Univ Feira de Santana, Earth Sci & Environm Modeling Program, Feira De Santana, BA, Brazil

[9] Pursuelife Consultancy Appl Sci, Salvador, BA, Brazil

来源：

EPL | 2018年 / 123卷 / 02期

关键词：

AIR-TEMPERATURE; EXCHANGE; SERIES;

D O I：

10.1209/0295-5075/123/20011

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The stochastic process of a turbulent flow in a pipeline provides a time series of the velocity field at any point of the domain by solving numerically the Navier-Stokes equation. The turbulent flow was produced by obstacles near the inlet, injecting eddies into the current. Moving downstream, these eddies evolve to a fully turbulent flow. Many length and time scales are involved in this process. We explore the cross-correlations of the velocity field time series at different points and also at different time scales using the detrended cross-correlation coefficient, rho(DCCA), designed to analyze the cross-correlations in non-stationary time series. Thus, the results with rho(DCCA) allow interpreting how these eddies propagate downstream, and also quantify how adherent the velocity fields are with respect to the pipeline position. Copyright (C) EPLA, 2018

引用

页数：6

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