Structured input-output analysis of oblique turbulent bands in Waleffe flow
Provides a new analytical tool for understanding turbulent band structures in shear flows, but the results are specific to Waleffe flow.
This work uses structured input-output analysis to identify the wavelength and inclination angle of oblique turbulent bands in Waleffe flow, with the response scaling as Re^1.7.
This work employs structured input-output analysis (SIOA) to study Waleffe flow. The SIOA framework employs structured uncertainty to include the componentwise structure of nonlinearity in Navier-Stokes equations, and SIOA quantifies the flow response using structured singular values. The structured input-output analysis identifies the wavelength and inclination angle of oblique turbulent bands observed in large-domain direct numerical simulations. The structured input-output response scales over Reynolds number as $\sim Re^{1.7}$.