Passively mode-locked lasers with semiconductor saturable absorption mirrors are attractive comb sources due to their simplicity, excellent self-starting properties, and their environmental robustness. These lasers, however, can have an increased noise level and wake mode instabilities. Here, we investigate the wake mode dynamics in detail using a combination of evolutionary and dynamical metho...

Turbulent wake is crucial for the visually appealing effects of liquid. Unfortunately, it is challenging to realistically simulate this phenomenon with ring-shaped vortical structures. To tackle this issue, we propose a filament-based turbulent wake synthesis method for realistically simulating the turbulent wake with ring-shaped vortical structures. The filaments are sampled at the separation ...

Abstract. We study the calibration of Dynamic Wake Meandering (DWM) model using high-spatial- and high-temporal-resolution SpinnerLidar measurements wake field collected at Scaled Wind Farm Technology (SWiFT) facility located in Lubbock, Texas, USA. derive two-dimensional flow characteristics including deficit, turbulence, meandering from lidar observations under different atmospheric stability...

The transition to turbulence induced by counter-rotating wall-normal rotating cylindrical roughness pairs immersed within a laminar boundary layer on flat plate is investigated with direct numerical simulations, dynamic mode decomposition (DMD) and perturbation kinetic energy (PKE) analysis. As long as the cylinder stub rotating, wake contains steady dominating inner vortex (DIV) surrounded sec...