Scopus
Direct Numerical Simulation of Turbulent Flow in a Circular Pipe Subjected to Radial System Rotation
Flow, Turbulence and Combustion · Kasım 2019
Makale Bilgileri
DergiFlow, Turbulence and Combustion
Yayın TarihiKasım 2019
Cilt / Sayfa103 · 1057-1079
Scopus ID2-s2.0-85071489485
Özet
Direct numerical simulations have been performed with a high-order spectral element method computer code to investigate the Coriolis force effect on a fully-developed turbulent flow confined within a circular pipe subjected to radial system rotations. In order to study the radially rotating effects on the flow, a wide range of rotation numbers (Roτ) have been tested. In response to the system rotation imposed, large-scale secondary flows appear as streamwise counter-rotating vortices, which highly interact with the boundary layer and have a significant impact on the turbulent flow structures and dynamics. A quasi Taylor-Proudman region occurs at low rotation numbers, where the mean axial velocity is invariant along the rotating axis. As the rotation number increases, laminarization occurs near the bottom wall of the pipe, and the flow becomes fully laminarized when the rotation number approaches Roτ = 1.0. The characteristics of the flow field are investigated in both physical and spectral spaces, which include the analyses of the first- and second-order statistical moments, pre-multiplied spectra of velocity fluctuations, budget balance of the transport equation of Reynolds stresses, and coherent flow structures.
Yazarlar (2)
1
Zhao Ping Zhang
2
Bing Chen Wang
Anahtar Kelimeler
Direct numerical simulation
Pipe flow
Rotating flow
Turbulence
Kurumlar
University of Manitoba
Winnipeg Canada
Metrikler
6
Atıf
2
Yazar
4
Anahtar Kelime