AE Research Publications
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A comprehensive modeling of choked twophase flow through shorttube orifices with application to alternative refrigerants HFO1234yf and HFO1234ze
(Elsevier Ltd., 201609)Due to the evaporating twophase flow and the chokedflow condition, numerical analysis of flow through shorttube orifices is a complicated procedure. A comprehensive method for analyzing such flows is the twofluid model, ... 
Integration of airfoil stall and compressibility models into a propeller blade element model
(American Society of Civil Engineers, 201607)The blade element method is an indispensible engineering design tool. It executes rapidly on a personal computer and is capable of accurate propeller performance predictions. An extensive literature survey reveals that for ... 
Guidance for precision threedimensional maneuvers through orifices using safepassage cones
(American Institute of Aeronautics and Astronautics, 201606)This paper proposes a safepassage conebased guidance strategy developed in a relative velocity framework to enable a generic aerial robot execute a precision threedimensional maneuver through a narrow orifice in a wall. ... 
Comprehensive two fluid model simulation of critical twophase flow through short tube orifices
(American Society of Mechanical Engineers, 2015)Smalldiameter tubes are utilized widely as expansion devices in refrigeration systems. They are employed in either kinds of shorttube orifices or long capillary tubes. Performance of these tubes is reliant upon critical ... 
Numericalbased comparison among critical flow properties of HFC134a and its new alternatives HFO1234yf and HFO1234ze through shorttube orifices
(American Society of Mechanical Engineers, 2015)Although HFC134a is a common refrigerant for residential and mobile refrigeration systems, investigators are dealing with replacing it with new alternatives because of its harmful environmental and global warming effects. ... 
Minimizing proton displacement damage dose during electric orbit raising of satellites
(American Institute of Aeronautics and Astronautics, 201604)Although electric propulsion systems have been used in deep space missions for performing interplanetary transfers, their use has primarily been restricted to stationkeeping purposes for Earthorbiting satellites. ... 
Preliminary investigation of flight loads of singleengine air tankers
(American Institute of Aeronautics and Astronautics, Inc., 201603)Operational data recorded from five agricultural aircraft are used to compare their flight loads. Four of the airframes were used as singleengine air tankers, whereas the fifth was flown exclusively for agricultural ... 
MPI/OpenMP hybridization of higher order WENO scheme for the incompressible NavierStokes equations
(American Institute of Aeronautics and Astronautics, 201501)With the contemporary emerging transition for the past two decades in high performance computing (HPC) towards clusters of nodes, it is possible to obtain an efficiently scalable CFD code by hybridization of Message ... 
Numerical simulation and experimental comparison of the R12, R22 and R134a flow inside straight and coiled helical capillary tubes
(© Springer International Publishing AG, Part of Springer Science+Business Media, 201603)This paper presents a numerical simulation for adiabatic condition of the R12, R22 and R134a flow through straight and helically capillary tubes and also an experimental investigation of the R134a flow inside straight and ... 
Low thrust orbitraising using nonsingular orbital elements and proximity quotient approach
(Univelt, Inc., 2015)Recent years have shown a growing interest in the space industry in allelectric satellites. Mission designers analyzing the optimal deployment options for all electric satellites need to consider three important metrics: ... 
Lowthrust orbitraising trajectories considering eclipse constraints
(Univelt, Inc., 2015)Manyrevolution electric orbitraising trajectories make numerous passages through the shadow of the Earth. The paper presents a new algorithm to determine the minimumtime trajectory of the spacecraft during orbitraising. ... 
Analytical model of Van Allen proton radiation flux for trajectory optimization solvers
(Univelt, Inc., 2015)Radiation damage is a concern for electric orbitraising of spacecraft to the Geostationary orbit because the spacecraft spends a lot of time in the Van Allen radiation belts. Trajectory optimization solvers are required ... 
A greedy random adaptive search procedure for multirendezvous mission planning
(Univelt, Inc., 201501)The paper proposes a new algorithm to optimize a sequence of rendezvous maneuvers by a spacecraft with multiple targets. The algorithm consists of two phases: the first phase generates feasible solutions of the problem ... 
Demandside energy management by use of a DesignthenApproximate controller for aggregated thermostatic loads
(IEEE, 2015)This paper presents a method to design a controller for a system of aggregated thermostatic loads (TCLs) that are represented by two coupled Partial Differential Equations  the FokkerPlanck Equations. The design goal is ... 
Stress model and strain energy release rate of a prescribed crack in scarf joint/repair of composite panels
(SAGE Publications, 201512)An analytical model for stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was ... 
Numericalbased nondimensional analysis of critical flow of R12, R22, and R134a through horizontal capillary tubes
(Elsevier B.V., 201510)Development of correlations predicting critical mass flow rate and critical pressure distribution through capillary tubes is presented. In order to accomplish such a work, the critical mass flow rate and pressure distribution ... 
Constrained and unconstrained propeller blade optimization
(American Institute of Aeronautics and Astronautics, 201507)Propeller optimization by means of calculus of variations is addressed in this paper. A procedure for deriving the EulerLagrange equations for both unconstrained and constrained propeller bladetwist optimization is ... 
Parametric exploration of wingbody junction flow using computational fluid dynamics
(American Institute of Aeronautics and Astronautics, 201509)The wingbody junction flow is investigated parametrically using computational fluid dynamics in an attempt to understand the effects of junction flow on aircraft drag, with a focus on application to large business jet or ... 
Frequency and time domain analysis of an aeroelastic wing multiple component structure
(Taylor & Francis Group, 20150902)A multiple component structure consisting of two EulerBernoulli beams connected to a rigid mass is used to model the heave dynamics of a wing micro air vehicle. In the time domain, the attainment of a C0semigroup in the ... 
Threedimensional fluidstructureinteraction simulation of tilting disk mechanical heart valve
(American Society of Mechanical Engineers, 2014)The current computational effort will focus on the numerical analysis of current tiling disk MHVs. In this work an implicit fluidstructureinteraction (FSI) simulation of the BjorkShiley design was carried out using ...