This article presents the results of a two-dimensional computational study into effects rotor blade thickness and camber on performance 5 kW scale vertical axis wind turbine. Validation is provided by reference to experimental data for pitching aerofoil with dynamic stall phenomenon. The turbine mapped out variety different tip speed ratios detailed investigations are presented determine how and, most importantly, why varies as it does. blades chosen were NACA0012, NACA0022, NACA5522 LS0421....

We present an approach to sensor placement for turbulent mean flow data assimilation in the context of Reynolds-averaged Navier–Stokes (RANS) simulations. It entails generating a spatial uncertainty map through eigenspace perturbations (ESPs) baseline turbulence model (e.g., k−ω shear stress transport model) quantify epistemic structural errors model. A novel greedy search algorithm is proposed place sensors targeting regions highest generated from ESP. The computationally efficient...

Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.

An airfoil parameterization method is proposed, which combines the flexibility and accuracy of Kulfan's class/shape function transformation intuitiveness Sobieczky's for sections. The proposed intuitive has been evaluated by comparing it with sections regarding their in inversely fitting a wide range airfoils. results show that able to successfully transform into fully parametric (in all design variables are aerodynamically related geometrical parameters) without loss airfoils tested.

In this paper, a high Reynolds number compressible flow simulation method based on the immersed boundary (IBM) is developed adaptive Cartesian grids to address two problems: one ability of large-scale grid generation, and other resolution thin shear layers. For former, an efficient automatic parallel generation proposed k-d tree theory. The has good scalability computational efficiency, e.g., 1.41 × 109 cells by 2048 cores takes only 0.40 min. latter, IBM-wall function coupling designed...

Two-dimensional and three-dimensional contour bumps are designed optimized for substantial wave drag reduction an un-swept natural laminar flow (NLF) wing (RAE5243 aerofoil section) at transonic speeds. An NLF is chosen in this study, as shock control more crucial such wings due to the requirement of favourable pressure gradients on a part wing. For validation purpose focus issues, boundary layer assumed be fully turbulent from leading edge. Key bump geometrical parameters including maximum...

This paper presents a computational study of rooftop size vertical axis wind turbine with straight blades (Htype). The model solves for the two dimensional and three unsteady flow fields around using sliding mesh technique. Interesting features about dynamic stall interaction blade wakes following are illuminated. Comparison 2D 3D simulations highlight strong effects, including tip losses effects supporting shaft arms.

This paper presents a computational study of rooftop size vertical axis wind turbine with straight blades (H-type turbine). The model solves for the two-dimensional and three-dimensional unsteady flow fields around based on Reynolds averaged Navier-Stokes equations sliding mesh technique to connect far-field fixed near field rotating rotor. Interesting features such as dynamic stall interaction blade wakes following are illuminated. Comparison 2D 3D simulations highlight strong three...

This paper describes the use of free-form-deformation (FFD) parameterization method to create a novel blade shape for highly loaded, transonic axial compressor. The geometry makes precompression (via an S-shaping around midspan) weaken shock and improve aerodynamic performance. It is shown how offers superior flexibility over traditionally used methods. design (produced via efficient optimization method) presented resulting flow analyzed in detail. efficiency benefit 2%, surpassing other...