Flow Characteristics and Fluid Forces Reduction of Flow Past Two Tandem Cylinders in Presence of Attached Splitter Plate

Ali Ahmed,Naqib Ullah,Abdul Wahid,Raheela Manzoor,Noreen Nadeem,Shazia Kalsoom,Irfan Kaymaz

doi:10.1155/2021/4305731

Abstract

Numerical simulations are carried out to study the flow around two tandem square cylinders (SC) under the effect of spacing ratio(g/D) and splitter plate length (l/D) for a fixed Reynolds number (Re) = 100. The g/D is varied from 0 to 10 and l/D is varied from 0.5 to 10. The splitter plate length is found to have strong effect on vortex shedding and fluid forces. The maximum reduction in mean drag coefficient is observed at l/D = 8, that is 15% and 78% for upstream and downstream cylinders, respectively. The maximum reduction in root-mean-square value of lift coefficient is found at l/D = 10, that is 99%. The flow pattern at both of these points is steady flow. There is 100% vortex shedding suppression for l/D > 5. The observed flow patterns for flow past tandem cylinders without splitter plate are; single bluff body (SBB), steady flow (SF), quasi-steady flow (QSF), fully developed flow (FDF) and fully developed two-row vortex street flow (FDTRVS) regimes. SBB, QSF and SF regimes were observed in presence of splitter plate.

Highlights

To the best of ours’ knowledge, for the proposed problem there is no numerical and experimental study reported in the literature
D, l and g are the width of the cylinder, length of the splitter plate and spacing between the cylinders, respectively
Parabolic velocity profile is adopted at the entrance position of the domain, while the convective boundary condition is adopted at the exit of the domain [27]

Summary

Introduction

To the best of ours’ knowledge, for the proposed problem there is no numerical and experimental study reported in the literature. From the results it is observed that as the size of D is increased from 20 to 30, the maximum variation in mean drag coefficient (CDmean) and Strouhal number (St fs D/U∞, where fs is the vortex shedding frequency) are 0.336% and 0.9%, respectively. E Flow Over Two Tandem Square Cylinders without Splitter Plate.

Results

Conclusion