Geometry of scale-to-scale energy and enstrophy transport in two-dimensional flow

作者：Liao Yang^*; Ouellette Nicholas T

来源：Physics of Fluids, 2014, 26(4): 045103.

DOI：10.1063/1.4871107

Using filter-space techniques, we analyze the transport of energy and enstrophy between scales in an experimental quasi-two-dimensional weakly turbulent flow. By decomposing the scale-to-scale energy and enstrophy fluxes into three components that consist of distinct types of triad interactions, we find that different triads are responsible for forward and inverse flux. To understand this behavior, we analyze the geometric alignment between the turbulent stresses that drive scale-to-scale transfer and the large-scale velocity and vorticity gradients, and show that different triad interactions have distinct alignment signatures. Our results shed light on the role played by geometric alignment in the net behavior of triad interactions in turbulence.

• 出版日期2014-4