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Towards real-time pilot-in-the-loop CFD simulations of helicopter/ship dynamic interface

International Journal of Modeling, Simulation, and Scientific Computing 2017年第4期8卷 64-88页

作者： Ilker Oruc Joseph F.Horn Jeremy Shipman Susan Polsky Department of Aerospace Engineering The Pennsylvania State University University Park PA 16802USA CRAFT Tech PipersvillePA 18947USA NAVAIR Paxutent RiverMD 20670USA

This study presents the development of computationally efficient coupling of Navier–Stokes Computational Fluid dynamics(CFD)with a helicopter flight dynamics model with the ultimate goal of real-time simulation of airwake effects in the helicopter/ship dynamic interface(DI).The flight dynamics model is free to move within a computational domain,where the main rotor forces are converted to source terms in the momentum equations of the CFD solution using an actuator disk ***,the CFD solver calculates induced velocities that are fed back to the simulation and affect the aerodynamic loads in the flight *** CFD solver models the inflow,ground effect and interactional aerodynamics in the flight dynamics simulation,and these calculations can be coupled with the solution of the external flow(e.g.,ship airwake effects).The simulation framework for fully-coupled pilot-in-the-loop(PIL)flight dynamics/CFD is demonstrated for a simplified shedding *** tests were performed with 0.38 million structured grid cells running on 352 processors and showed near-real-time *** to the coupling interface are described that allow the simulation run at near-real-time execution speeds on currently available computing *** in computing hardware are expected to allow real-time simulations.

关键词： Real-time pilot-in-the-loop computational fluid dynamics(CFD) flight dynamics simulation ship airwake dynamic interface helicopter flight dynamics simulation fully-coupled helicopter/ship

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Gaussian Beam Summation for Diffraction in Inhomogeneous Media Based on the Grid Based Particle Method

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Communications in Computational Physics 2010年第9期8卷 758-796页

作者： Shingyu Leung Hongkai Zhao Department of Mathematics Hong Kong University of Science and TechnologyClear Water BayHong Kong Department of Mathematics University of California at IrvineIrvineCA 92697-3875USA

We develop an efficient numerical method to compute single slit or double slit diffraction patterns from high frequency wave in inhomogeneous *** approximate the high frequency asymptotic solution to the Helmholtz equation using the Eulerian Gaussian beam summation proposed in[20,21].The emitted rays from a slit are embedded in the phase space using an open *** evolution of this open curve is accurately computed using the recently developed Grid Based Particle Method[24]which results in a very efficient computational *** the grid based particle method we proposed in[23,24],we represent the open curve or the open surface by meshless Lagrangian particles sampled according to an underlying fixed Eulerian *** end-points of the open curve are tracked explicitly and consistently with interior *** construct the overall wavefield,each of these sampling particles also carry necessary quantities that are obtained by solving advection-reaction *** experiments show that the resulting method can model diffraction patterns in inhomogeneous media accurately,even in the occurrence of caustics.

关键词： dynamic interface Gaussian beams diffraction high frequency asymptotic solution

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