Turbulence Structure of Particle-Laden Flow in a Vertical Plane Channel Due to Vortex Shedding

• Published in: JSME International Journal Series B Fluids and Thermal Engineering Vol. 44; no. 4; pp. 526 - 535
• Main Authors: KAJISHIMA, Takeo, TAKIGUCHI, Satoshi, HAMASAKI, Hiroyuki, MIYAKE, Yutaka
• Format: Journal Article
• Language: English
• Published: Tokyo The Japan Society of Mechanical Engineers 2001; Japan Society of Mechanical Engineers; Japan Science and Technology Agency
• Subjects: Computer simulation; Direct Numerical Simulation; Exact sciences and technology; Finite Difference Method; Fluid dynamics; Fundamental areas of phenomenology (including applications); Gas-Solid Two-Phase Flow; Multiphase and particle-laden flows; Multiphase Flow; Nonhomogeneous flows; Particle-Laden Turbulence; Particles (particulate matter); Physics; Reynolds number; Rotational flow and vorticity; Separated flows; Shear stress; Turbulence; Turbulent Flow; Vortex shedding; Wake; Wakes; Vortex shedding; Turbulent flow; Two-phase flow; Vertical pipe; Digital simulation; Wakes; Vortex flow; Spherical particle; Particle suspension; Turbulence structure; Finite difference method
• ISSN: 1340-8054; 1347-5371
• DOI: 10.1299/jsmeb.44.526

Turbulence modulation in particle-laden flow, especially the influence of vortex shedding, was investigated by means of the direct numerical simulation. To this end, we developed a finite-difference scheme to resolve the flow around each particle moving in turbulence. The method was applied to the flow around a sphere and the accuracy was confirmed up to the Reynolds number range with vortex shedding. The agreement between our 4th-order central finite-difference method and spectral method for turbulent channel flow without particles was also fine. Then, we simulated upward flow in a vertical channel including solid particles. The velocity and vorticity fluctuations as well as Reynolds shear stress were strongly affected by wakes from particles. The shed vortices were elongated in the mainstream direction by the velocity gradient and resulted in the hairpin vortices. They increased the energy production rate in couple with production due to particle-turbulence correlation.