A self-induced mechanism of large-scale helical structures in compressible turbulent flows
arxiv(2024)
摘要
A novel self-sustaining mechanism is proposed for large-scale helical
structures in compressible turbulent flows. The existence of two channels of
subgrid-scale and viscosity terms for large-scale helicity evolution is
confirmed for the first time, through selecting a physical definition of the
large-scale helicity in compressible turbulence. Under the influence of the
fluid element expansion, it is found that the helicity is generated at small
scales via the second-channel viscosity, and the inverse cross-scale helicity
transfers at inertial scales through the second-channel helicity flux.
Together, they form a self-induced mechanism, which provides a physical insight
into the long-period characteristic of large-scale helical structures in the
evolution of compressible flow systems.
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