Modeling of Coherent Evolution of Ocean Turbulence Based on Time-dependent Intrinsic Correlation

Turbulence is an irregular chaotic fluid state, whose generation and evolution are mainly carried out through the multi-scale coherent structures contained in the ocean water. In order to further understand the evolution mechanism of spatio-temporal coupled turbulence energy, a NA-MEMD-TDIC based turbulence evolution modeling method was proposed by using the shear fluctuation of nonlinear Marine microstructure measured by matrix turbulence profilers. The coherent structure of turbulent space-time synchronization is modeled. Firstly, noise-assisted multivariate empirical mode decomposition was used to adaptively decompose ocean turbulent shear signal multi-scale vortexes, and then energy contribution was used to identify main-scale vortexes. Finally, the time-dependent intrinsic correlation model of spatial multipoints was established. The results show that turbulence evolves irregularly in space-time, and the established model can effectively excavate the spatiotemporal evolution structure of turbulence.