The review describes the progress of research on aqueous interphases within rechargeable zinc metal batteries.

Abstract

Discrete-vortex methods are a class of low-order widely used to study unsteady aerodynamic phenomena. However, these demand high computational costs when subject large number vortices in the flowfield. This calls for model reduction discrete-vortex methods. A model-reduction technique is applied recently developed method which criticality leading-edge suction parameter (LESP) controls initiation and termination (LEVs). method, called LESP-modulated (LDVM), has been successfully recent work...

In this paper, we present an approach to obtain a desired leading-edge vortex (LEV) shedding pattern from unsteady airfoils through the execution of suitable motion kinematics. Previous research revealed that LEV is associated with suction parameter (LESP) exceeding maximum threshold. A low-order method called LESP-modulated discrete (LDVM) was also developed predict onset and termination airfoil undergoing prescribed current work, inverse-aerodynamic formulation based on LDVM generate...

In this paper, we present a physics-informed approach to tailor the lift profile of an unsteady airfoil through execution appropriate maneuver. previous research, low-order aerodynamic model based on thin theory was developed for predicting flowfield and loads airfoils undergoing arbitrary motions. The phenomenologically augmented using concept leading edge suction parameter (LESP) incorporate capability predict intermittent vortex (LEV) shedding. criticality LESP used onset termination LEV...

In this paper, we propose a method for model reduction in discrete-vortex methods.Discrete vortex methods have been successfully employed to separated and unsteady airfoil flows.Earlier research revealed that parameter called the Leading Edge Suction Parameter (LESP) can be used leading-edge (LEV) shedding flows.The LESP is measure of suction developed at leading edge, whenever exceeds critical value, discrete released from edge so as keep value.Although was successful predicting forces on...

This paper addresses the problem of path planning for fixed wing Unmanned Aerial Vehicles (UAVs) monitoring two different ground targets simultaneously. The UAVs are modelled as Dubins vehicles that can move only in forward direction and constrained by a bound on minimum turn radius. is formulated an optimal control with both state inequality constraints along terminal manifold constraint. Subsequently, time paths obtained using Pontryagin's principle.

This paper presents a state-variable formulation to model and simulate the 2D unsteady aerodynamics of an airfoil undergoing arbitrary motion kinematics. The builds upon large-angle aerodynamic in which is represented using lumped vortex element (LVE) model. divided into several panels, with bound placed on each panel. At any time instant, bound-vortex strengths are determined by employing zero-normal-flow conditions at control points located vorticity shed from trailing edge modeled...

In this work, we conduct a numerical study on static symmetric SD7003 airfoil encountering upstream vortical disturbances. A series of 2D RANS-based investigations are carried out using the commercial package ANSYS Fluent. circular cylinder with an attached splitter plate is used as disturbance generator. Previous research at NCSU has shown that sinusoidal oscillations cylinder-splitter assembly about axis center various frequencies and amplitudes can be to tailor frequency strength...

This paper uses numerical simulations to show the range of actuation frequencies that result in locked-on downstream vortex shedding from a cylinder-splitter plate bluff body. The simulation performed ANSYS Fluent is verified with selected published experimental results and extended higher actuating frequencies. time histories lift coefficient obtained are used conjunction snapshots ascertain upper lower bounds prescribed lead locked-in generation. Outside lock-in range, spectral map shows...

View Video Presentation: https://doi.org/10.2514/6.2023-4012.vid We present results of an airfoil encountering transverse gusts using theoretical modeling a modified discrete-vortex method, performed at NC State University, and experimental testing tow tank facility, the University Maryland. The framework is based on 2D lumped vortex element (LVE) method to model unsteady flow resulting from gust. An important feature approach predict intermittent LEV shedding leading edge suction parameter...

This paper describes the numerical study of oscillating circular cylinders with rigid splitter plates different lengths. These geometries may be used as disturbance generators for unsteady airfoils and wings operating in highly vortical flowfields. It has been shown that undergoing forced rotational oscillations at their natural shedding frequency can produce wakes minimal deviation cycle-to-cycle vortex strength position. Adding a plate allows these deviations to reduced even further. We...

View Video Presentation: https://doi.org/10.2514/6.2022-3991.vid This paper details the numerical study of vortex-dominated wakes behind oscillating cylinders and with attached splitter plates various lengths. Recent research has shown that these geometries can be used as disturbance generators for production highly vortical wake impingement on downstream unsteady airfoils wings. Adequate control flow field necessitates tailoring at frequencies may fall outside range natural vortex shedding...

Aerodynamic interactions between wings is an important area of research and presents interesting flow problems in both steady cases such as wing-tail fixed-wing aircraft, unsteady flapping-wing micro-air vehicles (MAVs), wind turbines, rotorcraft. In this paper, a theoretical low-order formulation for studying among arbitrary number two dimensional cambered lifting surfaces presented. Following the lines classical thin airfoil theory, each surface modeled bound distribution vorticity form...

Wing-wake interaction phenomena are often exploited in the natural world, for example fish schooling and bird flocking. This is also an interesting area of research with engineering applications such as blade-vortex interactions helicopters wind turbines, wing-vortex aircraft, aeroelastic energy harvesting systems. While experimental higher-order computational methods can be employed to study these phenomena, low-order required fast prediction. In this paper, a two-dimensional wing-wake...