Ali Esmaeili- PhD
- Professor (Assistant) at Ferdowsi University of Mashhad
Ali Esmaeili
- PhD
- Professor (Assistant) at Ferdowsi University of Mashhad
Assistant professor
About
42
Publications
22,143
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395
Citations
Introduction
Ali Esmaeili has Ph.D. in Aerospace Engineering. He got his degree at Instituto Superior Tecnico. He worked in the LASEF laboratory in Lisbon and focused on the aerodynamic of micro aerial vehicles and energy harvesters which could be used in this application. Various investigations such as computational fluid dynamic, experimental tests, modal and harmonic analysis, fluid-structure interaction and multidisciplinary design optimizations were parts of his effort.
Current institution
Additional affiliations
February 2013 - September 2018
September 2012 - January 2013
September 2009 - January 2013
Education
February 2013 - September 2018
Publications
Publications (42)
A pressure-based implicit procedure is due to solve Navier-Stokes equations. A non-orthogonal mesh with collocated finite volume formulation is used to simulate flow around the smart and conventional flaps of airfoil under the ground effect. Cantilever beam with uniformly varying load with roller support at the free end is considered for smart flap...
Aerodynamic characteristics of a wing with a smart flap under the ground
effect are studied through the integration of computational fluid
dynamics. A parametric bending profile of a smart flap is designed
considering different types of beams. Here, a cantilever beam with
uniformly varying load with roller support at the free end is
considered. The...
Aerodynamic characteristics of two-dimensional smart flap under the ground effect have been assessed by a numerical simulation. In this process, a pressure-based implicit procedure to solve Navier–Stokes equations on a nonorthogonal mesh with collocated finite volume formulation is used. The boundedness criteria for this procedure are determined fr...
This study presents a novel numerical methodology that is designed for the dynamic adjustment of three-dimensional high-rise building configurations in response to aerodynamic forces. The approach combines two core components: a numerical simulation of fluid flow and the adjoint method. Through a comprehensive sensitivity analysis, the influence of...
In an era marked by swift technological advancements and an escalating emphasis on collaborative learning, understanding effective methods and technologies for sharing knowledge is imperative to optimize educational outcomes. This study delves into the varied methods and technologies applied to facilitate and support knowledge sharing within learni...
This study presents the design, implementation, and assessment of a combined passive and active flow control technique with the aim of increasing the aerodynamic performance of fixed-wing Micro Air Vehicles (MAVs). Power consumption restrictions in MAVs support the choice of passive flow control solutions such as the use of a modified (tubercled) w...
In order to upsurge the maneuverability of micro aerial vehicles, a tubercle leading edge inspired by the whale flipper was applied as a passive stall control method. Although this method could be useful to control stall phenomena, the effect of geometrical properties on the flow physic should be investigated to reach the root of them. According to...
Aircraft wing design using Multidisciplinary Design Optimization (MDO) techniques is a complex task that involves different disciplines, mainly aerodynamic and structure. This study develops and explores a coupled aero-structural multidisciplinary model that optimizes the performance of CRJ-700 aircraft, taking into account its path-dependent behav...
In this study, the variation of amplitude and wavelength of the sinusoidal wing in the post-stall condition have been studied to evaluate the effect of each of these parameters on the control of the stall phenomenon and the stall’s sensitivity to Each of these two parameters is measured. For this purpose, an EPPLER considered as a wavy leading edge...
The underwater creatures have always desired to collect information about what is in beyond, for instance, the fishes that hunt birds with precise calculations. Possessing a subsurface device capable of imaging the outside area of water without any distortion can be notified of modern demand. To be acquainted with this phenomenon, a series of subme...
Scavenging energy from aeroelastic vibrations was considered for a self-powered hybrid passive-active stall control system intended to improve the aerodynamic performance of fixed-wing micro aerial vehicles without exhausting available batteries. It was found that the passive component of the system generates intense streamwise vortices, which give...
Supercritical water (SCW) as fluid with enough potential abilities such as high thermal efficiency can be replaced in water cooling systems. However, helical pipes are the most common type of swirl generators used for heat transfer enhancement, and their geometrical parameters contribute significantly to the compactness and efficiency of heat excha...
Optimization of the height and length distribution of roughness elements as an effective passive flow control tool was investigated in the current study. The purpose of this paper was to investigate the roughness element's effect and its location on upstream of the laminar separation bubble from a phase portrait point of view. Consequently, the eff...
Although the tubercle edge provide good maneuverability at post-stall conditions, the aerodynamic performance at pre-stall
angles are threatened by forming a laminar separation bubble at the trough section of the tubercle edge; consequently,
the endurance and range are reduced. In the present study, the idea of passive flow control is introduced by...
Micro aerial vehicles are small in size, and with due attention to their small size and low flight speed, they are usually confronted by many problems in terms of aerodynamic forces, and their stall occurs in low angles of attack. In order to increase the maneuverability and improve the performance of fixed-wing Micro Aerial Vehicles (MAV), a passi...
In this research, a different view of the study of the pattern and behavior of turbulent flow on the two full-span wings of baseline and sinusoidal leading-edge with periodic boundary condition by a numerical method is introduced. In this simulation, the Navier-Stokes equations are discretized by the finite volume method and solved using the improv...
Since laminar separation bubbles are neutrally shaped on the suction side of full-span wings in low Reynolds number flows,
a roughness element can be used to improve the performance of micro aerial vehicles. The purpose of this article was to
investigate the leading-edge roughness element’s effect and its location on upstream of the laminar separat...
At present time, the use of fixed-wing Micro Aerial Vehicles (MAV) is challenged by limited operation windows due to weight restrictions on the batteries and the decreased performance due to early onset of stall at high angles of attack. Aiming to overcome this problem, a hybrid active-passive stall control system was previously proposed for a wing...
Inspiring from nature, flying near the ground surface might increase the aerodynamic performance of Micro Aerial Vehicles (MAVs). Because of the being small in size, these birds have low flight speeds and their operating range is in the low Reynolds flow zone (Re <200000) where a laminar separation bubble (LSB) normally appears on the suction surfa...
Aircraft wing design using Multidisciplinary Design Optimization (MDO) techniques is a complex task which involves different disciplines, mainly aerodynamic and structure. The multidisciplinary feasible (MDF) method is a new MDO approach and it involves solving a single optimization problem that calls a multidisciplinary analysis (MDA) when objecti...
To increase the flight endurance of a Micro air vehicle (MAVs), which operates at low Reynolds number flow, one way is to harvest energy during its flight. By inspiring from the nature when all the birds use their feathers to control and distribute their power along the flying time, a solution might be design of a piezoelectric plate as feathers, w...
The major challenge in fixed-wing micro-aerial vehicles (MAV) is their low flight endurance due to energy limitations. A solution might be the design of a piezoelectric harvester to scavenge energy directly from the fluid flow past the MAV. Cantilever beams with a piezoelectric layer undergoing vortex-induced vibrations can convert the mechanical e...
This study presents new developments required for fixed-wing MAVs, aiming to increase their aerodynamic performance and maneuverability. Since these small vehicles have been restricted by the weight and space requirement to mount batteries inside them, the flight endurance and performance have been sharply decreased. To overcome on the weaknesses,...
The use of various modeling approaches for the numerical simulation of low-Reynolds-number flow past wings of finite span with leading-edge protuberances is studied at pre- and poststall operating conditions. Variants of Reynolds-averaged Navier–Stokes simulations (including transitional modeling) and detached-eddy simulations (involving different...
A design optimization involving mechanical and electrical considerations is proposed with the aim of improving the performance of bimorph piezocomposite energy harvesters for micro-electromechanical systems. Maximization of the power density ratio of the transducer was achieved using a Multidisciplinary Design Feasible method accounting for several...
OriginalResearchPaper Received23January2016 Accepted18February2016 AvailableOnline16April2016 In this research, a new numerical approach which is capable of modifying the shape of three dimensional massive bodies like tall buildings with respect to aerodynamic loads is presented; therefore, the aerodynamic forces are improved; consequently, the com...
In this research, the effect of shape parameters such as number of magnet wire turns, spools, thickness of the gap, and pole length in a Magneto-rheological (MR) fluid damper is analytically investigated and the optimization of these parameters is done with response surface method (RSM) which is combined Neuro-Fuzzy method and Particle Swarm Optimi...
Using of smart materials in hydrofoils increases the efficiency of high-speed boats. The aim of this paper is development and simulation of flow around the smart hydrofoil and comparison of it with the conventional ones. Then, the effect of submerge distance (h/c), angle of flap (AOF) and Froude number (Fr) is studied. The free surface waves, gener...
In this research, the plunging motion of an airfoil by a numerical method based on finite volume in different Reynolds numbers is simulated and the thickness effect, amplitude and reduced frequency on the aerodynamic coefficients are investigated. In this process, SIMPLEC algorithm, implicit solver, high order scheme and dynamic mesh method is used...
The SST k-ω DDES model has been used to study the influence of wing aspect ratio on passive stall control at low Reynolds number using sinusoidal leading edges. Both stalled and unstalled flow conditions were considered to analyze the effect of low Reynolds number corrections on the performance of the DDES model. It was concluded that major improve...
Abstract
A pressure-based implicit finite-volume technique is used to solve the Navier–Stocks equation, simulating flow around a smart hydrofoil. The Volume of Fraction (VOF) method is applied to track the free surface. This simulation focuses two main goals. Initially, the equation of a free surface wave, generated by the moving submerge hydrofoi...
Stereo Particle Image Velocimetry measurements of the flow field around a unity aspect
ratio wing with a sinusoidal leading-edge have been carried out at a Reynolds number
Re = 140, 000 for two angles of attack, a = 0º and 15º. These measurements are intended to
be used for improved computational modeling of the flow employing Detached Eddy
Simulat...
A pressure-based implicit finite-volume technique is used to solve the Navier–Stocks equation, simulating flow around a smart hydrofoil. The Volume of Fraction (VOF) method is applied to track the free surface. This simulation focuses two main goals. Initially, the equation of a free surface wave, generated by the moving submerge hydrofoil, is extr...
Optimization of the sectional wing in ground effect (WIG) has been studied by using a high order numerical procedure and response surface method (RSM). Initially, the effects of the ground clearance, angle of attack, thickness, camber of wing have been investigated by a high-resolution scheme, which is so strong and very accurate. In the numerical...
In this study, a numerical method is used to assess the effect of thickness, camber, submergence depth and flow velocity around a submerge hydrofoil. A pressure based algorithm is used to solve Navier-stokes equations, and Volume of Fluid (VOF) approach is applied to simulate two-phase fluid (water and air). The k-ε model and second order upwind sc...
A pressure-based implicit procedure to solve Navier-Stokes equations on a nonorthogonal mesh with collocated finite volume formulation is used to simulate flow around the smart and conventional flaps of spoiler under the ground effect. Cantilever beam with uniformly varying load with roller support at the free end is considered for smart flaps. The...
The prediction of aerodynamic characteristics and smart flap of airfoil under the ground effect have been carried out by the integration of computational fluid dynamics. Considering different types of beams, a parametric bending profile of a smart flap is designed. Cantilever beam with uniformly varying load with roller support at the free end is c...
Questions
Questions (2)
Hello all,
I am simulating a cantilever beam in harmonic. The base of the beam is fluctuated and then maximum tip displacement according the frequency is obtained. The maximum tip displacement will be occurred at the resonance or anti-resonance frequencies. The maximum value was not occurred at the exact frequency when I compare the numerical results with the experiment ones. My question is that which parameters have more effect on resonance and anti-resonance frequencies? How can I get the peak at the correct frequency (resonance or anti-resonance)?
Hello all,
I would like to simulate a piezoelectric harvester and I need to define open circuit to extract voltage output. I know how define piezoelectric material and boundary conditions. When the piezo material is forced, then voltage will be generated and for extracting the voltage, we need to define an open circuit contained by resistor.
It would be appreciated if you help me for getting voltage from the harmonic simulation.
