Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session A23: Turbulent Convection
8:00 AM–9:57 AM,
Sunday, November 19, 2023
Room: 149AB
Chair: Peter Hamlington, University of Colorado Boulder
Abstract: A23.00007 : Exploring Jump Rope Vortex Dynamics in Turbulent LiquidMetal Rayleigh-BÅLenard Convection Under Diverse MechanicalBoundary Conditions*
9:18 AM–9:31 AM
Presenter:
Shahzad Sarwar
(University of Coventry)
Authors:
Shahzad Sarwar
(University of Coventry)
Susanne Horn
(Coventry University)
Existing research has primarily focused on no-slip boundary conditions on the characteristics of turbulent thermal convection. However, a comprehensive understanding of the role of various boundary conditions in modulating the fully 3D motion of the jump rope vortex, remains elusive. Each boundary condition, no-slip, free-slip, periodic, and mixed impose unique constraints on the flow, which consequently affects the LSCs and jump rope vortex dynamics, as well as the heat and momentum transport. In this study, we systematically quantify the effects of these diverse boundary conditions on the morphology, stability, and heat transfer properties of the jump rope vortex. We will present results from an array of DNS in liquid metal with $Pr=0.025$, covering Rayleigh numbers in the range of $Ra = 1.0 imes10^4$ to $1.0 imes10^6$. Furthermore, we explore variations in the domain's aspect ratio, ranging from $Gamma = 2$ to $5$ with both square and rectangle bases.
This knowledge can be invaluable for the development of theoretical models and the interpretation of observational data in the context of convective systems.
*n/a
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