Paper Info
Title
Numerical Simulation of Drag Reduction on a Square Rod Detached with Two Control Rods at Various Gap Spacing via Lattice Boltzmann Method
Abstract
Numerical simulations are performed to examine the effect of size of control rods (d1) and spacing ratio (g) on flow around a square rod with upstream and downstream control rods aligned in-line using the lattice Boltzmann method (LBM). The Reynolds number (Re) is fixed at Re = 160, while the spacing between the main rod and control rods is taken in the range 1 <= g <= 5 and the size of the control rod is varied between 4 and 20. Seven different types of flow mods are observed in this study at different values of g and d1. Variation in force statistics, like mean drag coefficient (C-dmean), Strouhal number (St), root mean square values of drag (C-drms) and lift coe fficients (C-lrms), and percentage reduction in mean drag coefficient is discussed in detail. It was examined that vortex shedding completely suppressed at (g, d1) = (1, 12), (2, 12), and (2, 16) where steady flow mode exists. Moreover, it was found that at large gap spacing, where g = 5, the effect of control rods on the main rod vanishes. Due to this strong vortex shedding produced and as a result, maximum value of C-dmean is found at (g, d1) = (5, 8). The negative values of mean drag force are also observed at some gap spacing and size of control rods are due to the effect of thrust. Furthermore, the maximum percentage reduction in C-dmean is 121%, found at (g, d1) = (2, 20).
Year
DOI
Venue
2020
10.3390/sym12030475
SYMMETRY-BASEL
Keywords
DocType
Volume
numerical simulations,control rods,drag reduction,lattice Boltzmann method,square rod,vortex shedding
Journal
12
Issue
Citations 
PageRank 
3
0
0.34
References 
Authors
0
6
Name
Order
Citations
PageRank
Raheela Manzoor100.68
Asma Khalid200.34
Ilyas Khan32525.71
Shamsul Islam410.70
Dumitru Baleanu533878.57
K. S. Nisar61512.15