Vankevich R.E., Rodionov A.A.
The article shows a mathematical model to study the characteristics and mechanisms of formation of wave and vortex structures formed by the flow around the obstacle at the scales corresponding to submesoscale phenomena in natural conditions. The problem of flow around a barrier in the form of a hemisphere with a diameter of 20 m with a base at the bottom of a two-layer laminar flow of a viscous incompressible liquid is solved. The vortex dynamics of the flow behind the barrier was resolved explicitly using the hybrid method of detached eddies. Based on numerical experiments, it is shown that in the studied range of Froude number 0.0017–0.0272 the flow process is non-stationary with the formation of coherent vortex structures that grow over time and down the stream to the characteristic scales of the obstacle, and then transfer energy to the wave components.
