Introduction. The Karman-vortex street formed behind two-dimensional bluff bodies has attracted interest because of its beautiful flow pattern. It goes without saying that this beautifulness results from the alternative vortices regularly shed from the body. Vortex shedding induces aerodynamic force perpendicular to the mean flow. This force causing mechanical vibration of the model is accompan...

Numerical simulation of the turbulent flow around a triangular cylinder at a Reynolds number of 45,000 is presented in this paper. Both steady and unsteady vortexshedding results are presented. A body force potential model is used to model the turbulent motion. This approach is able to model non-equilibrium turbulence accurately at a cost and complexity comparable to k-ε models. The numerical m...

This paper mainly researched on influence of vortex generator on lift coefficient and drag coefficient, when vortex generator is mounted on a flat plate. Vented cylinders were used as vortex generators which intensify vortex shedding in the wake of the vented cylinder as compared to base line circular cylinder which ensures more attached flow and increases lift force of the system. Firstly vent...

Over the years, several research projects have evaluated different concepts for wind-assisted propulsion, generally concluding that it can lead to significant fuel savings. The time-averaged propulsive performance of a single rigid wingsail has been analysed in previous studies. However, unsteady characteristics external loads which may induce structural vibration are also important be consider...

Results are presented from low Reynolds number experimental investigations of vortex-induced vibration and comparison is made with results from corresponding twoand three-dimensional direct numerical simulations. It is shown that three-dimensional simulations are required to reproduce the response envelope observed experimentally. Phase-averaged contours of spanwise vorticity demonstrate the pr...

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The vibration of an elastic beam experiencing vortex-induced vibration is numerically analyzed through a wake-oscillator model using the finite differences method. The influence of the excited mode, the initial velocity, the shedding pulsation and the mass ratio on the energy transfer among modes and the vibration amplitude is determined. Multiple frequencies are detected, and the power spectra...

The flow around two tandem circular cylinders leads to significant lift fluctuation in the downstream cylinder owing periodic vortex shedding. To address such research issues, we present herein a numerical study that uses deep reinforcement learning perform active control (AFC) on with low Reynolds number of 100, where actuator causes rotation cylinder. First, center spacing ratio L* varies fro...

A direct numerical simulation (DNS) code is constructed for solving flow across a three-dimensional deformable bluff body. In the present study, DNS of flow across rigid and compliant cylinders is performed to evaluate the code and the drag reduction effect with a compliant coating. The Strouhal number of shedding of the Karman vortex is calculated and it agrees well with that reported in the l...

We investigate the incompressible flow past a square cylinder immersed in wake of an upstream nearby splitter plate separating two streams different velocity. The bottom stream Reynolds number, based on side, $Re_B=56$ is kept constant while top-to-bottom numbers ratio $R\equiv Re_T/Re_B$ increased range $R\in[1,6.5]$, corresponding to coupled variation bulk number $Re\equiv(Re_T+Re_B)/2\in[56,...