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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TL;DR: In this article, a modal frequency domain implementation of the Vortex Lattice method is proposed, resulting in a generalised force matrix, which is validated by comparison to wind tunnel flutter data obtained from rectangular cantilever flat plate wings.
18 citations
TL;DR: In this article, the wing and jet singularities are embedded in a uniform stream and an iterative solution technique is employed to obtain the singularity strengths and locations of the jet position.
Abstract: Analysis of the interaction of wings with regions of high-energy flow in a uniform stream is motivated by the requirement to predict the aerodynamic characteristics of powered lift systems. The present formulation of the wing/jet problem includes jet deflection and distortion effects. Each jet boundary and wing is replaced by equivalent flow singularities embedded in a uniform stream. The singularity strengths and locations cannot be obtained directly since the jet position is unknown; therefore, an iterative solution technique is employed. Example calculations are presented and comparisons of current solutions are made with previous analyses and experiments.
18 citations
18 citations
01 Jan 2003
TL;DR: In this paper, the effects of the tunnel and a vortical inflow are modeled via GBFLOW-3D by solving the 3-D Euler equations with slip boundary conditions on the walls and by representing the effect of the propeller blades via body forces.
Abstract: This paper presents the coupling of a vortex lattice method (MPUF-3A), a finite volume method (GBFLOW3D), and a boundary element method (PROPCAV) to allow for the prediction of rudder sheet cavitation, including the effect of propeller, as well as the effects of tunnel walls. The unsteady cavity prediction on the propeller blades is performed using MPUF-3A to satisfy both a constant pressure condition on the cavity surface and the flow tangency condition on the cavity and blade surfaces. The effects of the tunnel and a vortical inflow are modeled via GBFLOW-3D by solving the 3-D Euler equations with slip boundary conditions on the walls and by representing the effect of the propeller blades via body forces. The cavity prediction on the rudder is accomplished via PROPCAV (which can handle back and face leading edge or mid-chord cavitation) in the presence of the 3-D flow field produced by the propeller. This flow-field is determined via GBFLOW-3D, in which the propeller is represented via a non-axisymmetric distribution of body forces. The effects of the tunnel walls are also considered in this case by applying a boundary element method on the walls, in the presence of the rudder. A multi-block Euler scheme is also developed in order to determine the effect of the rudder on the propeller
18 citations
TL;DR: In this article, the authors investigated the effect of cavitation on turbine performance and found that up to 30% theoretical loss in generated power is predicted for a particular case of a model turbine subjected to cavitation under specific test conditions.
18 citations