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23 papers · 1 filter
Vortex-magnetic competition and regime transitions in antiparallel flux tubes
Weiyu Shen, Rodolfo Ostilla-Mónico, Xiaojue Zhu
Vortex-magnetic interactions shape magnetohydrodynamic (MHD) turbulence, influencing energy transfer in astrophysical, geophysical, and industrial systems. On the Sun, granular-sca…
Constructing wall turbulence using hierarchical hairpin vortices
Weiyu Shen, Yuchen Ge, Zishuo Han +2
Wall-bounded turbulence is characterized by coherent, worm-like structures such as hairpin vortices. The attached-eddy model provides a successful statistical framework for the log…
Reinforcement-learning-based control of turbulent channel flows at high Reynolds numbers
Zisong Zhou, Mengqi Zhang, Xiaojue Zhu
Deep reinforcement learning (DRL) is employed to develop control strategies for drag reduction in direct numerical simulations (DNS) of turbulent channel flows at high Reynolds num…
Transition to turbulence in the wide-gap spherical Couette system
Ankit Barik, Santiago A. Triana, Michael Hoff +1
The spherical Couette system consists of two differentially rotating concentric spheres with a fluid filled in between. We study a regime where the outer sphere is rotating rapidly…
Transport scaling in porous media convection
Xiaojue Zhu, Yifeng Fu, Marco De Paoli
We present a theory to describe the Nusselt number (), corresponding to the heat or mass flux, as a function of the Rayleigh--Darcy number (), the ratio of buoyant driving…
Scaling relations in quasi-static magnetoconvection with a strong vertical magnetic field
Shujaut H. Bader, Xiaojue Zhu
The scaling law for the horizontal length scale relative to the domain height , originating from the linear theory of quasi-static magnetoconvection, $\ell/L \sim Q^{-1/6…