Optimal triggering of jet bifurcation: an example of optimal forcing applied to a time-periodic base flow

Galerkin force model for transient and post-transient dynamics of the fluidic pinball

“…The Landau model is experimentally supported for the onset of vortex shedding behind the cylinder wake (Schumm, Berger & Monkewitz 1994;Zielinska & Wesfreid 1995). Generalizations explain the cross-talk between different frequencies over the base flow (Luchtenburg et al 2009;Shaabani-Ardali, Sipp & Lesshafft 2020), special cases of 'quasi-laminar' interactions foreshadowed by Reynolds & Hussain (1972).…”

“…Generalizations explain the cross-talk between different frequencies over the base flow (Luchtenburg et al. 2009; Shaabani-Ardali, Sipp & Lesshafft 2020), special cases of ‘quasi-laminar’ interactions foreshadowed by Reynolds & Hussain (1972).…”

Efficient computation of global resolvent modes

“…In general, it is not clear how to choose an effective set of modes. If forces of interest are sufficiently low dimensional, an expansion in an orthogonal basis can provide an effective description for optimization (Shaabani-Ardali, Sipp & Lesshafft 2020), but for three-dimensional flows with high-rank forcing this approach becomes costly.…”

Response of supercritical round jets to various excitation modes

“…2020), deep learning control (Tang et al. 2020) and optimization techniques (Sau & Mahesh 2010; Kim, Bodony & Freund 2014; Wu, Wong & Zhou 2018; Shaabani-Ardali, Sipp & Lesshafft 2020) have been applied in the flow control to enhance the performance of the control systems.…”