36 citations · 157 across the 13 of their papers we have counts for
15 papers
Direct numerical simulations of turbulent drag reduction via piezoelectric actuation
Amir Amjadimanesh, Aman Kidanemariam, David Chappell +2
We have conducted Direct Numerical Simulations of turbulent half-channel flow over realistic surface deformations at friction Reynolds number . We generated the surface d…
Delamination Detection in Layered Waveguides using Ostrovsky Wave Packets
J. S. Tamber, D. J. Chappell, M. R. Tranter
We examine the scattering of Ostrovsky wave packets, generated from an incident solitary wave, in a two layered waveguide with a delamination in the centre and soft (imperfect) bon…
On Direction Preserving Discretizations for Computing Phase-Space Densities
David J. Chappell, Martin Richter, Gregor Tanner
Ray flow methods provide efficient tools for modelling wave energy transport in complex systems at high-frequencies. We compare two Petrov-Galerkin discretizations of a phase-space…
Detecting Delamination via Nonlinear Wave Scattering in a Bonded Elastic Bar
J. S. Tamber, D. J. Chappell, J. C. Poore +1
In this paper we examine the effect of delamination on wave scattering, with the aim of creating a control measure for layered waveguides of various bonding types. Previous works h…
A direction preserving discretization for computing phase-space densities
David J. Chappell, Jonathan J. Crofts, Martin Richter +1
Ray flow methods are an efficient tool to estimate vibro-acoustic or electromagnetic energy transport in complex domains at high-frequencies. Here, a Petrov-Galerkin discretization…
Transfer operator approach to ray-tracing in circular domains
J Slipantschuk, M Richter, D J Chappell +3
The computation of wave-energy distributions in the mid-to-high frequency regime can be reduced to ray-tracing calculations. Solving the ray-tracing problem in terms of an operator…
Ray and wave scattering in smoothly curved thin shell cylindrical ridges
Niels Sondergaard, David Chappell
We propose wave and ray approaches for modelling mid- and high- frequency structural vibrations through smoothed joints on thin shell cylindrical ridges. The models both emerge fro…
Transport of phase space densities through tetrahedral meshes using discrete flow mapping
Janis Bajars, David Chappell, Niels Sondergaard +1
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 trans…
On sparse reconstructions in near-field acoustic holography using the method of superposition
Nadia M. Abusag, David J. Chappell
The method of superposition is proposed in combination with a sparse optimisation algorithm with the aim of finding a sparse basis to accurately reconstruct the structural…
Boundary integral solution of potential problems arising in the modelling of electrified oil films
David J. Chappell
We consider a class of potential problems on a periodic half-space for the modelling of electrified oil films, which are used in the development of novel switchable liquid optical…
A boundary integral formalism for stochastic ray tracing in billiards
David J. Chappell, Gregor Tanner
Determining the flow of rays or particles driven by a force or velocity field is fundamental to modelling many physical processes, including weather forecasting and the simulation…
Discrete flow mapping: transport of phase space densities on triangulated surfaces
David Chappell, Gregor Tanner, Niels Sondergaard +1
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…
Solving the stationary Liouville equation via a boundary element method
David J. Chappell, Gregor Tanner
Intensity distributions of linear wave fields are, in the high frequency limit, often approximated in terms of flow or transport equations in phase space. Common techniques for sol…
Boundary element dynamical energy analysis: a versatile method for solving two or three dimensional wave problems in the high frequency limit
David J. Chappell, Gregor Tanner, Stefano Giani
Dynamical energy analysis was recently introduced as a new method for determining the distribution of mechanical and acoustic wave energy in complex built up structures. The techni…
Dynamical energy analysis for built-up acoustic systems at high frequencies
D. J. Chappell, S. Giani, G. Tanner
Standard methods for describing the intensity distribution of mechanical and acoustic wave fields in the high frequency asymptotic limit are often based on flow transport equations…