The goal of the present investigation is to gain a better understanding, using numerical simulation, of the aerodynamic interference between propeller and wing during different flight phases of a VSTOL unmanned-aerial-vehicle (UAV). The... more
T he reduction of noise emission has become a key commercial argument for heli- copter manufacturers, such as Airbus Helicopters. For years, Airbus helicopters has placed emphasis on the good acoustic behavior of its helicopters, as... more
During the HART-I data analysis, the need for comprehensive wake data was found including vortex creation and aging, and its re-development after blade-vortex interaction. In October 2001, US Army AFDD, NASA Langley, German DLR, French... more
Joined wing configuration is considered as a candidate for future aeroplanes. It is an unconventional aeroplane configuration with several possible advantages like induced drag reduction and weight reduction due to the closed wing... more
The following work is a short revision of CFD analysis of unconventional aircraft configuration, that has been done in The Institute of Aviation during the contribution within MOSUPS consortium. Following article contains short... more
Studies on the 3D flow around a section of a rotor blade based on the SSC-A09 airfoil were presented. An investigation has been performed using experimental and computational tools. The research was conducted for a wide range of angles of... more
Computational investigations of the Vortex Ring State (VRS) on a helicopter main rotor have been conducted. The VRS phenomenon is a condition of powered flight that occurs most frequently during the vertical or nearly vertical descent of... more
The methodology of simulation of a rotorcraft flight has been developed and applied to simulate several stages of flight of light helicopter. The methodology is based on coupling of several computational models of Computational Fluid... more
In trimmed flight of a helicopter, all the forces and moments, aerodynamic, inertial, and gravitational, are in balance. Keeping the helicopter in trimmed state, needs a precise adjustment of flight controls. The methodology of simulation... more
Present paper study aerofoil with NACA2412 with Fowler and Single Slotted flaps that were used for the purpose of numerical investigation the effect of energy adder on the trace of wake behind the proposed wing at a Reynolds number of... more
The buildup of ice on lifting devices during flight manifests a risk to any aircraft safety. A major rolling parameter in the criteria of aircraft icing is the ice roughness which indicates surface roughness induced with the initial... more
The calculation of inverse dynamics (ID) solutions is widely used to examine potential injury risks and sources for performance enhancement. The results of these calculations are influenced, among others, by the chosen set of body segment... more
Experiments are presented which were conducted on flow fields produced by a circulation control airfoil utilizing the Coanda effect at the trailing edge. The application of holographic interferometry to obtain both visualization and... more
My deepest gratitude to Witold Koning, without whose knowledge, support, and guidance this study would not have been possible. A special thanks to Geoffrey Ament for his assistance and contribution to the experimental data used in this... more
The Black Nightmare Bombardier UAV MAR-X8 is an advanced unmanned aerial vehicle engineered for high-impact military operations across multiple combat environments. Built with cutting-edge stealth design, AI-based targeting systems, and... more
The continuous surge in gas prices has raised major concerns about vehicle fuel efficiency, and drag reduction devices offer a promising strategy. In this paper, we investigate the mechanisms by which geometrically optimized bumps, placed... more
Forecasting bifurcations is a significant challenge and an important need in several applications. Most of the existing forecasting approaches focus on bifurcations in nonoscillating systems. However, subcritical and supercritical flutter... more
The aim of this work is to study flow properties at Gradual Expansion junction of pipe, Head loss suffered by the flow after passing through Gradual Expansion junction and to study reliability of the classical engineering formulas used to... more
The concept of harnessing wind power has been around for centuries, and is first recorded by the Persians in 900 AD. These early uses of wind power were for the processing of food, particularly grinding grains, and consisted of stationary... more
swash-plate, and its associated control linkages. This mechanism is also the major contributing factor to fatal accidents associated with helicopter flight. However, the swash-plate is an essential component in providing controlled... more
The concept of harnessing wind power has been around for centuries, and is first recorded by the Persians in 900 AD. These early uses of wind power were for the processing of food, particularly grinding grains, and consisted of stationary... more
Circulation control technology and motion in close proximity to the ground have both shown aerodynamic benefits in the generation of lift. Recent research efforts at West Virginia University have explored the potential of merging the two... more
Dynamic simulation procedures of the aircraft 3D motion need robust and efficient integration methods in order to allow for reliable (and possibly real-time) simulation missions. Derivation of such integration schemes in coordinate-free... more
This paper presents a design tool for optimizing wind turbine blades. The work considers optimizing the blade of wind turbines with respect to maximizing the energy yield of a wind turbine. The design variables are the shape parameters... more
Dynamics of gas-turbine blades are particularly aero-elastic coupling sensitive. These aerodynamic limits can be pushed away by adding extra damping to the structure in order to reach even better compressor performance. However nowadays... more
Dynamics of gas-turbine blades are particularly aero-elastic coupling sensitive. These aerodynamic limits can be pushed away by adding extra damping to the structure in order to reach even better compressor performance. However nowadays... more
Cost-effective optimization of centrifugal fans requires quick and reliable methods to evaluate the target function. A typical target function is maximization of total-to-static efficiency for a given design point. In this work, we... more
A quick method for the design of efficiency-optimal centrifugal fan impellers is presented. It is based on an evolutionary optimization algorithm that identifies the optimal geometrical parameters for a given aerodynamic objective... more
This work presents a numerical study conducted in ANSYS CFX® V18.1 that seeks to improve the efficiency of a Michell Banki turbine by modifying one of its geometric parameters: the profile of the blades in the runner. Four aerodynamic... more
This work presents a mesh refinement indicator based on entropy variables, with an application to the compressible Navier-Stokes equations. The entropy variables are shown to satisfy an adjoint equation, an observation that allows recent... more
Recent developments at the NASA Ames Hypervelocity Free Flight Aerodynamic Facility (HFFAF) ballistic range are described, including the conversion of the shadowgraph stations from film-based cameras to digital cameras. The various... more
As part of a morphing wing technology project, the flutter analysis of two finite element models and the experimental results of a morphing wing demonstrator equipped with aileron are presented. The finite element models are representing... more
Within the lifecycle of the product, the reduced models are very important for the experimental validation of the prototype. The modelling, simulation and optimization stage precedes the prototype realization, being part of the computer... more
Natural ventilation of animal houses clearly has advantages as for instance its low power consumption. However its application is often limited due to the lack of a reliable measuring and control system of the ventilation rate and so of... more
A test facility for field measurements of natural ventilation in livestock buildings was developed. Choice of used materials and methods were taken into account: ultrasonic wind anemometers, linear guiding systems for sensor movement and... more
This archival note describes jet noise source location measurements using the Polar Correlation Technique in the 24 ft wind tunnel of the Royal Aircraft Establishment at Farnborough. Because of its size, the tunnel provided a convenient... more
In order to optimize the parameters of the plasma plume for atmospheric pressure plasma applications such as biological and industrial applications, it is highly necessary to thoroughly understand its characteristics. In this paper,... more
To meet sustainable development goals and address concerns on climate change, much of the world's energy demand is expected to be delivered from clean alternative energy sources. Small-scale wind turbines have proven to be applicable... more
Wind Turbine Fault Detection through Principal Component Analysis and Statistical Hypothesis Testing
This paper addresses the problem of online fault detection of an advanced wind turbine benchmark under actuators (pitch and torque) and sensors (pitch angle measurement) faults of different type: fixed value, gain factor, offset and... more
In a crosswind scenario, the risk of high-speed trains overturning increases when they run on viaducts since the aerodynamic loads are higher than on the ground. In order to increase safety, vehicles are sheltered by fences that are... more
Several three-dimensional Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations of the passing generic vehicles (Ahmed bodies) are presented. The relative motion of vehicles was obtained using a combination of deforming and sliding... more
The flow around a finite circular cylinder with a height-to-diameter ratio of 6 was studied using large eddy simulation (LES). The cylinder was mounted on a ground plane where a thin boundary layer with a thickness of only 7% of the... more
Large-eddy simulation (LES) was used to study the influence and the resulting flow mechanisms of active flow control applied to a two-dimensional vehicle geometry. The LES results were validated against existing Particle Image Velocimetry... more
Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and... more
Aerodynamic methods used in the early stages of conceptual design are necessarily simple for the sake of speed and convenience. They may also involve simplifying assumptions with a significant impact on their accuracy. This may result in... more
This White Paper has been produced by the Vehicle Aerodynamics Subcommittee of the AIAA Applied Aerodynamics Technical Committee, with contributions from interested parties inside and outside AIAA. The objective of this paper is to define... more
Lecture given at the IUTAM Symposium on Nonlinear dynamics of systems and structures for green energy generation
This paper introduces a modeling level-oriented approach for BIM studies according to the abstraction of generated information structures. Models for different abstraction levels are necessary to define patterns, describe rules, store... more
Models for a 3D pendulum, consisting of a rigid body that is supported at a frictionless pivot, were introduced in a 2004 CDC paper [1]. A subsequent paper, in the 2005 ACC [2], developed stabilizing controllers for a fully actuated 3D... more