Flow structure and heat transport in low Prandtl-number vertical convection
Final Report Abstract
Key Findings and Experiments: 1. Experimental and Theoretical Integration: Experiments in Dresden used liquid gallium-indium-tin (GaInSn, Pr ≈ 0.03) in a rectangular vessel, with flow velocities measured by Ultrasonic Doppler Velocimetry (UDV). Göttingen performed DNS to complement experimental data, resolving fine computational meshes to study high Rayleigh numbers (Ra). 2. Plate Size as a Key Length Scale: Results confirmed that heat is primarily transported by horizontal boundary layers, not the bulk flow, with plate size being the critical length scale. 3. Magnetic Field Effects on VC: Introducing a horizontal magnetic field significantly altered the flow, creating oscillations and secondary flows, especially when thermal and electromagnetic forces were balanced. 4. Additional Investigations: Studies covered varied VC configurations, such as bottom-side heating, and explored magnetoconvection under vertical magnetic fields. Research also evaluated the applicability of the Oberbeck-Boussinesq approximation and scaling in rapidly rotating thermal convection. The project culminated in significant insights into turbulent VC and magnetoconvection dynamics, publishing seven papers in top journals like Journal of Fluid Mechanics and Europhysics Letters. Further studies are planned to refine understanding, particularly regarding magnetic field influences and local flow organization.
Publications
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Dynamics and length scales in vertical convection of liquid metals. Journal of Fluid Mechanics, 932.
Zwirner, Lukas; Emran, Mohammad S.; Schindler, Felix; Singh, Sanjay; Eckert, Sven; Vogt, Tobias & Shishkina, Olga
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Heat transport in a cell heated at the bottom and the side (a). EPL (Europhysics Letters), 134(3), 34001.
Teimurazov, Andrei; Reiter, Philipp; Shishkina, Olga & Frick, Peter
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Oscillatory large-scale circulation in liquid-metal thermal convection and its structural unit. Journal of Fluid Mechanics, 977.
Teimurazov, Andrei; Singh, Sanjay; Su, Sylvie; Eckert, Sven; Shishkina, Olga & Vogt, Tobias
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Wall mode dynamics and transition to chaos in magnetoconvection with a vertical magnetic field. Journal of Fluid Mechanics, 975.
McCormack, Matthew; Teimurazov, Andrei; Shishkina, Olga & Linkmann, Moritz
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Scaling regimes in rapidly rotating thermal convection at extreme Rayleigh numbers. Journal of Fluid Mechanics, 984.
Song, Jiaxing; Shishkina, Olga & Zhu, Xiaojue
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Unifying heat transport model for the transition between buoyancy-dominated and Lorentz-force-dominated regimes in quasistatic magnetoconvection. Journal of Fluid Mechanics, 980.
Teimurazov, Andrei; McCormack, Matthew; Linkmann, Moritz & Shishkina, Olga
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What Rayleigh numbers are achievable under Oberbeck–Boussinesq conditions?. Journal of Fluid Mechanics, 986.
Weiss, Stephan; Emran, Mohammad S. & Shishkina, Olga
