By tuning the angle between background shear and a directional small-scale force, turbulent kinetic energy can be made to flow to larger or smaller scales, yielding a net forward (downscale) energy flux in 2D flow.
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Manipulating the direction of turbulent energy flux via tensor geometry in a two-dimensional flow
By tuning the angle between background shear and a directional small-scale force, turbulent kinetic energy can be made to flow to larger or smaller scales, yielding a net forward (downscale) energy flux in 2D flow.