Transport of phase space densities through tetrahedral meshes using discrete flow mapping

Bajars, J ORCID: https://orcid.org/0000-0001-7601-8694, Chappell, DJ ORCID: https://orcid.org/0000-0001-5819-0271, Søndergaard, N and Tanner, G, 2017. Transport of phase space densities through tetrahedral meshes using discrete flow mapping. Journal of Computational Physics, 328, pp. 95-108. ISSN 0021-9991

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Abstract

Discrete flow mapping was recently introduced as an efficient ray based method determining wave energy distributions in complex built up structures. Wave energy densities are transported along ray trajectories through polygonal mesh elements using a finite dimensional approximation of a ray transfer operator. In this way the method can be viewed as a smoothed ray tracing method defined over meshed surfaces. Many applications require the resolution of wave energy distributions in three-dimensional domains, such as in room acoustics, underwater acoustics and for electromagnetic cavity problems. In this work we extend discrete flow mapping to three-dimensional domains by propagating wave energy densities through tetrahedral meshes. The geometric simplicity of the tetrahedral mesh elements is utilised to efficiently compute the ray transfer operator using a mixture of analytic and spectrally accurate numerical integration. The important issue of how to choose a suitable basis approximation in phase space whilst maintaining a reason able computational cost is addressed via low order local approximations on tetrahedral faces in the position coordinate and high order orthogonal polynomial expansions in momentum space.

Item Type:	Journal article
Publication Title:	Journal of Computational Physics
Creators:	Bajars, J., Chappell, D.J., Søndergaard, N. and Tanner, G.
Publisher:	Elsevier
Date:	1 January 2017
Volume:	328
ISSN:	0021-9991
Identifiers:	Number Type 10.1016/j.jcp.2016.10.019 DOI
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	28 Oct 2016 15:03
Last Modified:	12 Oct 2017 08:10
URI:	https://irep.ntu.ac.uk/id/eprint/28976

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