Powerboats in operation represent a system consisting of a number of complex components such as: surface propellers, aerodynamics and hydrodynamics; which interact with each other and with the wind and water surface conditions. By measuring the behaviour of the powerboat it is possible to create a mathematical model using system identification methods. A neural network model has been generated ...

Abstract In this paper, various bluff-body shapes (cylindrical, square, star) and two different surface topologies (smooth, wavy) are applied as passive tools for controlling a non-premixed hydrogen flame in combustion chamber. We focus on the dynamics of its time-averaged characteristics close vicinity an injection system within formed recirculation zones also far-field. The research is perfor...

Near-wall flow simulation remains a central challenge in aerodynamics modelling: Reynolds-averaged Navier–Stokes predictions of separated flows are often inaccurate, and large-eddy (LES) can require prohibitively small near-wall mesh sizes. A deep learning (DL) closure model for LES is developed by introducing untrained neural networks into the governing equations training situ incompressible a...

A prominent feature of gliding flight in snakes of the genus Chrysopelea is the unique cross-sectional shape of the body, which acts as the lifting surface in the absence of wings. When gliding, the flying snake Chrysopelea paradisi morphs its circular cross-section into a triangular shape by splaying its ribs and flattening its body in the dorsoventral axis, forming a geometry with fore-aft sy...

Abstract Free-stream turbulence is present in many engineering applications and known to affect both bluff body aerodynamics heat transfer. In this work, its effects on the transfer near wake behind a sphere are studied. To do this, direct large-eddy simulations of flow at moderate Reynolds numbers R e = 1000 10 4 , with levels incoming up % length scale O ( D ) being diameter, performed. At un...

Abstract In recent years, conditioned particle image velocimetry (CPIV) has attracted much attention for flame front extraction. It is an economical and straightforward technique because the can be obtained simply from Mie-scattering images. current work, hydroxyl planar laser-induced fluorescence (OH-PLIF) measurements were taken simultaneously to study applicability of CPIV under conditions w...

In this project, linear feedback control is used to modify the dynamics of fluid flows. We focus on two system identification and controller design strategies that target separated wakes behind bluff bodies. In particular, we aim to reduce the form drag and suppress the large fluctuations that typically develop in such wakes and are detrimental to efficiency and safety in a large number of indu...

This paper briefly reviews bluff body aerodynamics and focuses mainly on the use of short and thin splitter plates to interfere with the vortex wakes and suppress vortex-induced forces (VIF). The present investigation primarily examines the suppression of unsteady, two-dimensional wake instabilities over a low Reynolds number range of less than 250. A circular cylinder is used as the bluff body...

The potential energy-saving benefit for vehicles when travelling in a ‘platoon’ formation results from the reduction total aerodynamic drag which may result interaction of bluff bodies close-proximity. Early investigations platooning, prompted by problems congestion, had shown but was not pursued. More recently, technologies developed connected-autonomous vehicle control have provided renewed i...