Upper bound of transient growth in accelerating and decelerating wall-driven flows using the Lyapunov method
This work addresses stability analysis in fluid dynamics for researchers, but it is incremental as it applies an existing Lyapunov approach to a specific flow scenario.
The paper tackled the problem of quantifying transient energy growth in accelerating and decelerating wall-driven flows by developing a Lyapunov method to compute an upper bound, finding that decelerating flows exhibit significantly larger transient growth compared to accelerating flows.
This work analyzes accelerating and decelerating wall-driven flows by quantifying the upper bound of transient energy growth using a Lyapunov-type approach. By formulating the linearized Navier-Stokes equations as a linear time-varying system and constructing a time-dependent Lyapunov function, we obtain an upper bound on transient energy growth by solving linear matrix inequalities. This Lyapunov method can obtain the upper bound of transient energy growth that closely matches transient growth computed via the singular value decomposition of the state-transition matrix of linear time-varying systems. Our analysis captures that decelerating base flows exhibit significantly larger transient growth compared with accelerating flows. Our Lyapunov method offers the advantages of providing a certificate of uniform stability and an invariant set to bound the solution trajectory.