Discrete Flow Mapping - A Mesh Based Simulation Tool for Mid-to-High Frequency Vibro-Acoustic Excitation of Complex Automotive Structures

2014 ◽  
Vol 7 (3) ◽  
pp. 1198-1204 ◽  
Author(s):  
Gregor Tanner ◽  
David J. Chappell ◽  
Dominik Löchel ◽  
Niels Søndergaard
Keyword(s):  
High Frequency ◽  
Acoustic Excitation ◽  
Simulation Tool ◽  
Flow Mapping ◽  
Automotive Structures ◽  
Discrete Flow

High-frequency combustion oscillations produced by mode selective acoustic excitation

1988 ◽  
Vol 21 (1) ◽  
pp. 1427-1434 ◽  
Author(s):  
Souad Zikikout ◽  
Sébastien Candel ◽  
Thierry Poinsot ◽  
Arnaud Trouvé ◽  
Emile Esposito
Keyword(s):  
High Frequency ◽  
Acoustic Excitation

Turbulence suppression in subsonic jets by high-frequency acoustic excitation

1999 ◽  
Vol 34 (1) ◽  
pp. 23-28 ◽  
Author(s):  
E. V. Vlasov ◽  
A. S. Ginevskii ◽  
R. K. Karavosov ◽  
T. M. Makarenko
Keyword(s):  
High Frequency ◽  
Acoustic Excitation ◽  
Turbulence Suppression

scholarly journals Opal: An open source ray-tracing propagation simulator for electromagnetic characterization

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0260060
Author(s):  
Esteban Egea-Lopez ◽  
Jose Maria Molina-Garcia-Pardo ◽  
Martine Lienard ◽  
Pierre Degauque
Keyword(s):  
Ray Tracing ◽  
High Frequency ◽  
Maxwell Equations ◽  
Simulation Tool ◽  
Game Engine ◽  
Electromagnetic Propagation ◽  
Graphical Processing Units ◽  
3D Environments ◽  
Graphical Processing ◽  
Frequency Approximation

Accurate characterization and simulation of electromagnetic propagation can be obtained by ray-tracing methods, which are based on a high frequency approximation to the Maxwell equations and describe the propagating field as a set of propagating rays, reflecting, diffracting and scattering over environment elements. However, this approach has been usually too computationally costly to be used in large and dynamic scenarios, but this situation is changing thanks the increasing availability of efficient ray-tracing libraries for graphical processing units. In this paper we present Opal, an electromagnetic propagation simulation tool implemented with ray-tracing on graphical processing units, which is part of the Veneris framework. Opal can be used as a stand-alone ray-tracing simulator, but its main strength lies in its integration with the game engine, which allows to generate customized 3D environments quickly and intuitively. We describe its most relevant features and provide implementation details, highlighting the different simulation types it supports and its extension possibilites. We provide application examples and validate the simulation on demanding scenarios, such as tunnels, where we compare the results with theoretical solutions and further discuss the tradeoffs between the simulation types and its performance.

scholarly journals Discrete flow mapping: transport of phase space densities on triangulated surfaces

2013 ◽  
Vol 469 (2155) ◽  
pp. 20130153 ◽  
Author(s):  
David J. Chappell ◽  
Gregor Tanner ◽  
Dominik Löchel ◽  
Niels Søndergaard
Keyword(s):  
Phase Space ◽  
Large Scale ◽  
Weather Forecasting ◽  
Linear Wave ◽  
Hamiltonian Vector Field ◽  
Flow Mapping ◽  
Space Applications ◽  
Flow Equations ◽  
Triangulated Surfaces ◽  
Discrete Flow

Energy distributions of high-frequency linear wave fields are often modelled in terms of flow or transport equations with ray dynamics given by a Hamiltonian vector field in phase space. Applications arise in underwater and room acoustics, vibroacoustics, seismology, electromagnetics and quantum mechanics. Related flow problems based on general conservation laws are used, for example, in weather forecasting or in molecular dynamics simulations. Solutions to these flow equations are often large-scale, complex and high-dimensional, leading to formidable challenges for numerical approximation methods. This paper presents an efficient and widely applicable method, called discrete flow mapping , for solving such problems on triangulated surfaces. An application in structural dynamics, determining the vibroacoustic response of a cast aluminium car body component, is presented.

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