Modification of conservation laws for 2D turbulent flows

In two-dimensional decaying turbulence, kinetic energy and enstrophy are transferred to large and small scales, respectively. Identifying the flow structures that affect these transfers is a critical consideration towards flow modification. We propose and numerically implement two flow modification strategies that selectively and simultaneously change kinetic energy and enstrophy to drive the system towards steady states. Energy modification excites characteristic flow structures associated with smaller wavenumbers than enstrophy modification.