Topic
Vortex lattice method
About: Vortex lattice method is a research topic. Over the lifetime, 779 publications have been published within this topic receiving 9242 citations.
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01 Sep 1980
TL;DR: VORLAX program was developed to incorporate direct extension of vortex lattice method into supersonic flow regime, thus providing analyst with full flow range capability.
Abstract: Several variations of vortex lattice method that are currently available have proved practical and versatile theoretical tools for aerodynamic analysis and design of planar and nonplanar configurations. Success of method is due in great part to relative simplicity of numerical technique involved and to accuracy of results obtained; however, most of available procedures are for subsonic flow applications. VORLAX program was developed to incorporate direct extension of vortex lattice method into supersonic flow regime, thus providing analyst with full flow range capability.
7 citations
01 Jan 2002
TL;DR: In this article, a combination of genetic algorithms and sequential quadratic programming was employed to find the optimum combination of flapping frequency, flapping amplitude, pitch amplitude, and phase difference between pitching and heaving that gave maximum efficiency for a given thrust.
Abstract: This paper presents an application of Genetic Algorithm and Sequential Quadratic Programming in improving the performance of flapping wings. A Vortex Lattice Method was employed to model a finite-span flapping wing. The flapping wing model investigated was a rigid rectangular-planform plate with two degrees of freedom, i.e. pitching and heaving. A combination of Genetic Algorithms and Sequential Quadratic Programming was employed to find out the optimum combination of flapping frequency, flapping amplitude, pitch amplitude and phase difference between pitching and heaving that gave maximum efficiency for a given thrust. The hybrid optimization method was superior in solution search capability to that of GA or SQP alone. A function approximation of aerodynamic forces was made using Radial Basis Function to improve computational time cost. However, further refinement was necessary for a successful application of this method in high dimensional search space.
7 citations
TL;DR: In this article, an O N Dipole Panel Fast Multipole Method (DPFMM) was proposed for the evaluation of the induced velocity in the Unsteady Vortex Lattice Method (UVLM).
7 citations
TL;DR: In this paper, a 6-DOF linear model that considers canopy additional mass was established with benchmark state calculated by a four-degree-of-freedom (4DOF) longitudinal static model to solve parafoil state variables in straight steady flight.
7 citations
01 Jan 2016
TL;DR: In this article, the hydrodynamic design of a pre-swirl stator with radially variable pitch, paired with a conventional propeller, is described, and the aim is to achieve the highest possible efficiency in various operating conditions, and to avoid efficiency penalties in off-design operation.
Abstract: Over the last two decades, an increasing number of studies have been conducted to develop and improve energy saving devices (ESDs) in order to increase the propulsive efficiency. One well-known example is the pre-swirl stator (PSS), which consists of an often asymmetric arrangement of fixed stator blades ahead of the propeller. This paper describes the hydrodynamic design of a pre-swirl stator with radially variable pitch, paired with a conventional propeller. The aim is to achieve the highest possible efficiency in various operating conditions, and to avoid efficiency penalties in off-design operation. To investigate the propeller and stator designs and configurations in different operating conditions, the computationally inexpensive vortex-lattice method is used as a first step to optimize the geometry in an initial parameter study. Then the flow over hull, stator and propeller is simulated in a CFD-based approach to confirm the results obtained in the first stage.
7 citations