Dr Andrew Buchan
Senior Lecturer in Engineering Science
School of Engineering and Materials Science
Queen Mary University of London
Queen Mary University of London
Research
Computational Physics, Reactor Physics, Finite Elements
Interests
I specialise in developing computational methods for multi-physics modelling of radiation, fluid flow, and heat transfer, with applications in nuclear engineering, environmental flows, pollution dispersion, ultraviolet-C light for disease removal in air, and chemical removal in drinking water. I have over 20 years of research experience in developing numerical methods, spanning finite elements, control volume, adaptive resolution, Krylov solvers, multi-grid, reduced-order models, sub-grid models, sensitivity analysis, uncertainty quantification, and AI-based modelling. I have developed several frameworks, including FETCH and FETCH2, which are multi-physics codes for nuclear modelling based at Imperial College London, and Wyvern, a coupled radiation-fluid flow simulator for assessing ultraviolet light inactivation of diseases in air and water. I have secured over £8 million in research funding, including an EPSRC early career research fellowship.Publications
Publications of specific relevance to the Centre for Intelligent Transport2024
A reduced order model discretisation of the space-angle phase-space dimensions of the Boltzmann transport equation with application to nuclear reactor problemsBuchan AG, Navon IM and Yang L
Journal of Computational Physics, Elsevier vol. 517, 113268-113268.
10-07-2024
2023
Computational Modelling in Nuclear Science and Engineering: The Role of Artificial IntelligencePain C, Tehrani A, Heaney C, Chen B, Nwegbu K, Phillips T, Jones A, Dargaville S, Buchan A, Smith P, Bankhead M and Cacuci D
Nuclear Future vol. 19 (5), 42-50.
01-09-2023
Solving the Discretised Neutron Diffusion Equations using Neural Networkstoby P, heaney C, Chen B, Buchan A and Pain C
International Journal For Numerical Methods in Engineering, Wiley
12-07-2023
2022
Authors reply to comment by Michio Aoyama on “Development of a gamma ray dose rate calculation and mapping tool for Lagrangian marine nuclear emergency response models” by Little et al.Little A, Piggott MD and Buchan AG
Marine Pollution Bulletin, Elsevier vol. 184
10-10-2022
An adaptive reduced order model for the angular discretization of the Boltzmann transport equation using independent basis sets over a partitioning of the space-angle domainHughes AC and Buchan AG
International Journal For Numerical Methods in Engineering vol. 123 (16), 3781-3799.
30-08-2022
Optimised Adjoint Sensitivity Analysis Using Adjoint Guided Mesh Adaptivity Applied to Neutron Detector Response CalculationsBuchan AG, Cacuci DG, Dargaville S and Pain CC
Energies, Mdpi vol. 15 (14), 5102-5102.
13-07-2022
Development of a gamma ray dose rate calculation and mapping tool for Lagrangian marine nuclear emergency response modelsLittle A, Piggott MD and Buchan AG
Marine Pollution Bulletin, Elsevier vol. 181
08-07-2022
Inactivation Rates for Airborne Human Coronavirus by Low Doses of 222 nm Far-UVC RadiationWelch D, Buonanno M, Buchan AG, Yang L, Atkinson KD, Shuryak I and Brenner DJ
Viruses, Mdpi vol. 14 (4)
25-03-2022
2021
Improved estimates of 222 nm far-UVC susceptibility for aerosolized human coronavirus via a validated high-fidelity coupled radiation-CFD codeBuchan AG, Yang L, Welch D, Brenner DJ and Atkinson KD
Scientific Reports, Springer Nature vol. 11 (1)
07-10-2021
Reduced-order modelling applied to the multigroup neutron diffusion equation using a nonlinear interpolation method for control-rod movementHeaney CE, Buchan AG, Pain CC and Jewer S
Energies vol. 14 (5)
01-03-2021
A comparison of element agglomeration algorithms for unstructured geometric multigridDargaville S, Buchan AG, Smedley-Stevenson RP, Smith PN and Pain CC
Journal of Computational and Applied Mathematics, Elsevier vol. 390
12-01-2021
2020
Predicting airborne coronavirus inactivation by far-UVC in populated rooms using a high-fidelity coupled radiation-CFD modelBuchan AG, Yang L and Atkinson KD
Scientific Reports, Springer Nature vol. 10 (1)
12-11-2020
A discontinuous and adaptive reduced order model for the angular discretization of the Boltzmann transport equationHughes AC and Buchan AG
International Journal For Numerical Methods in Engineering, Wiley vol. 121 (24), 5647-5666.
20-09-2020
A three-phase interpenetrating continua approach for wave and porous structure interactionYang L, Buchan A, Pavlidis D, Jones A, Smith P, Sakai M and Pain C
Engineering Computations, Emerald Publishing Limited.
14-05-2020
2019
Scalable angular adaptivity for Boltzmann transportDargaville S, Buchan AG, Smedley-Stevenson RP, Smith PN and Pain CC
Journal of Computational Physics, Elsevier Bv, 109124-109124.
20-11-2019
Angular adaptivity with spherical harmonics for Boltzmann transportDargaville S, Buchan AG, Smedley-Stevenson RP, Smith PN and Pain CC
Journal of Computational Physics, Elsevier Bv vol. 397, 108846-108846.
31-07-2019
A combined immersed body and adaptive mesh method for simulating neutron transport within complex structuresBuchan AG, Dargaville S and Pain CC
Annals of Nuclear Energy, Elsevier Bv vol. 134, 88-100.
11-06-2019
An angular reduced order model for radiative transfer in non grey mediaBUCHAN AG
Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier
09-03-2019
Scalable angular adaptivity and robust error metricsDargaville S, Buchan AGB, Smedley-Stevenson RP, Smith PN and Pain CC
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019., 52-60.
01-01-2019
A Reduced Order Model for the Fast Predictions of Reactivity and Neutron Distributions within Reactor CoresBuchan A, Jewer S and Navon IM
International Conference on Computational & Experimental Engineering and Sciences, Tech Science Press vol. 22 (4), 179-179.
01-01-2019
Angular adaptivity with filtered PDargaville S, Buchan AG, Smedley-Stevenson RP, Smith PN and Pain CC
Transactions of the American Nuclear Society. vol. 120, 479-482.
01-01-2019
Adaptive Modelling for Multiphase Flow Through Debris Bed With BoilingYang L, Buchan A, Jones A, Smith P, Sakai M and Pain C
International Conference on Computational & Experimental Engineering and Sciences, Tech Science Press vol. 22 (1), 95-95.
01-01-2019
2018
A Haar Wavelet Method for Angularly Discretising the Boltzmann Transport EquationAdigun BJ, BUCHAN AG, Adam A, Dargaville S, Goffin MA and Pain CC
Progress in Nuclear Energy, Elsevier
13-06-2018
Reactor simulators and reduced order modelingHeaney CE, Pain CC, Buchan AG and Jewer S
Nuclear Future vol. 14 (3), 49-54.
01-01-2018
2017
A goal-based angular adaptivity method for thermal radiation modelling in non grey mediaSoucasse L, Dargaville S, Buchan AG and Pain CC
Journal of Quantitative Spectroscopy and Radiative Transfer vol. 200, 215-224.
19-06-2017
Adaptive angle and parallel multigrid for deterministic shielding problemsDargaville S, Buchan A, Smedley-Stevenson R, Smith P and Pain C
Epj Web of Conferences, Edp Sciences vol. 153
01-01-2017
2016
An efficient space-angle subgrid scale discretisation of the neutron transport equationBuchan AG and Pain CC
Annals of Nuclear Energy, Elsevier vol. 94, 440-450.
01-08-2016
2015
Solving the Boltzmann transport equation with multigrid and adaptive space/angle discretisationsDargaville S, Goffin MA, Buchan AG, Pain CC, Smedley-Stevenson RP, Smith PN and Gorman G
Annals of Nuclear Energy, Elsevier vol. 86, 99-107.
01-12-2015
Adaptive Haar wavelets for the angular discretisation of spectral wave modelsAdam A, Buchan AG, Piggott MD, Pain CC, Hill J and Goffin MA
Journal of Computational Physics vol. 305, 521-538.
02-11-2015
Non-intrusive reduced order modelling of the Navier–Stokes equationsXiao D, Fang F, Buchan AG, Pain CC, Navon IM and Muggeridge A
Computer Methods in Applied Mechanics and Engineering vol. 293, 522-541.
28-05-2015
A POD reduced order model for resolving angular direction in neutron/photon transport problemsBuchan AG, Calloo AA, Goffin MG, Dargaville S, Fang F, Pain CC and Navon IM
Journal of Computational Physics vol. 296, 138-157.
04-05-2015
2014
Goal-based angular adaptivity applied to a wavelet-based discretisation of the neutral particle transport equationGoffin MA, Buchan AG, Dargaville S, Pain CC, Smith PN and Smedley-Stevenson RP
Journal of Computational Physics vol. 281, 1032-1062.
06-11-2014
Reduced order modelling of an unstructured mesh air pollution model and application in 2D/3D urban street canyonsFang F, Zhang T, Pavlidis D, Pain CC, Buchan AG and Navon IM
Atmospheric Environment, Elsevier vol. 96, 96-106.
01-10-2014
Adjoint eigenvalue correction for elliptic and hyperbolic neutron transport problemsMerton SR, Smedley-Stevenson RP, Pain CC and Buchan AG
Progress in Nuclear Energy, Elsevier vol. 76, 1-16.
01-09-2014
Goal-based angular adaptivity applied to the spherical harmonics discretisation of the neutral particle transport equationGoffin MA, Buchan AG, Belme AC, Pain CC, Eaton MD, Smith PN and Smedley-Stevenson RP
Annals of Nuclear Energy, Elsevier vol. 71, 60-80.
01-09-2014
An immersed body method for coupled neutron transport and thermal hydraulic simulations of PWR assembliesJewer S, Buchan AG, Pain CC and Cacuci DG
Annals of Nuclear Energy, Elsevier vol. 68, 124-135.
01-06-2014
Non-linear model reduction for the Navier–Stokes equations using residual DEIM methodXiao D, Fang F, Buchan AG, Pain CC, Navon IM, Du J and Hu G
Journal of Computational Physics, Elsevier vol. 263, 1-18.
01-04-2014
Reduced order borehole induction modellingArdjmandpour N, Pain CC, Fang F, Buchan AG, Singer J, Player MA, Xu X, Navon IM and Carter J
International Journal of Computational Fluid Dynamics, Taylor & Francis vol. 28 (3-4), 140-157.
16-03-2014
The immersed body supermeshing method for modelling reactor physics problems with complex internal structuresBuchan AG, Farrell PE, Gorman GJ, Goddard AJH, Eaton MD, Nygaard ET, Angelo PL, Smedley-Stevenson RP, Merton SR and Smith PN
Annals of Nuclear Energy, Elsevier vol. 63, 399-408.
01-01-2014
2013
A POD reduced‐order model for eigenvalue problems with application to reactor physicsBuchan AG, Pain CC, Fang F and Navon IM
International Journal For Numerical Methods in Engineering, Wiley vol. 95 (12), 1011-1032.
03-07-2013
Minimising the error in eigenvalue calculations involving the Boltzmann transport equation using goal-based adaptivity on unstructured meshesGoffin MA, Baker CMJ, Buchan AG, Pain CC, Eaton MD and Smith PN
Journal of Computational Physics, Elsevier vol. 242, 726-752.
01-06-2013
Goal based mesh adaptivity for fixed source radiation transport calculationsBaker CMJ, Buchan AG, Pain CC, Tollit BS, Goffin MA, Merton SR and Warner P
Annals of Nuclear Energy, Elsevier vol. 55, 169-183.
01-05-2013
An adjoint-based method for improving computational estimates of a functional obtained from the solution of the Boltzmann Transport EquationMerton SR, Buchan AG, Pain CC and Smedley-Stevenson RP
Annals of Nuclear Energy, Elsevier vol. 54, 1-10.
01-04-2013
Multimesh anisotropic adaptivity for the Boltzmann transport equationBaker CMJ, Buchan AG, Pain CC, Farrell PE, Eaton MD and Warner P
Annals of Nuclear Energy, Elsevier vol. 53, 411-426.
01-03-2013
Simulated spatially dependent transient kinetics analysis of the Oak Ridge Y12 plant criticality excursionBuchan AG, Pain CC, Tollit BS, Gomes JLMA, Eaton MD, Gorman GJ, Cooling CM, Goddard AJH, Nygaard ET, Angelo PL and Smith PN
Progress in Nuclear Energy, Elsevier vol. 63, 12-21.
01-03-2013
Non-linear Petrov–Galerkin methods for reduced order modelling of the Navier–Stokes equations using a mixed finite element pairXiao D, Fang F, Du J, Pain CC, Navon IM, Buchan AG, ElSheikh AH and Hu G
Computer Methods in Applied Mechanics and Engineering, Elsevier vol. 255, 147-157.
01-03-2013
2012
Simulated transient dynamics and heat transfer characteristics of the water boiler nuclear reactor – SUPO – with cooling coil heat extractionBuchan AG, Pain CC, Goddard AJH, Eaton MD, Gomes JLMA, Gorman GJ, Cooling CM, Tollit BS, Nygaard ET, Glenn DE and Angelo PL
Annals of Nuclear Energy, Elsevier vol. 48, 68-83.
01-10-2012
Quadratic inner element subgrid scale discretisation of the Boltzmann transport equationBaker CMJ, Buchan AG, Pain CC, Tollit B, Eaton MD and Warner P
Annals of Nuclear Energy, Elsevier vol. 45, 124-137.
01-07-2012
A sub‐grid scale finite element agglomeration multigrid method with application to the Boltzmann transport equationBuchan AG, Pain CC, Umpleby AP and Smedley‐Stevenson RP
International Journal For Numerical Methods in Engineering, Wiley vol. 92 (3), 318-342.
12-06-2012
2011
Riemann boundary conditions for the Boltzmann transport equation using arbitrary angular approximationsBuchan AG, Merton SR, Pain CC and Smedley-Stevenson RP
Annals of Nuclear Energy, Elsevier vol. 38 (5), 1186-1195.
01-05-2011
2010
The Inner-Element Subgrid Scale Finite Element Method for the Boltzmann Transport EquationBuchan AG, Candy AS, Merton SR, Pain CC, Hadi JI, Eaton MD, Goddard AJH, Smedley-Stevenson RP and Pearce GJ
Nuclear Science and Engineering, Taylor & Francis vol. 164 (2), 105-121.
01-02-2010
2008
Optimal discontinuous finite element methods for the Boltzmann transport equation with arbitrary discretisation in angleMerton SR, Pain CC, Smedley-Stevenson RP, Buchan AG and Eaton MD
Annals of Nuclear Energy, Elsevier vol. 35 (9), 1741-1759.
01-09-2008
Linear and Quadratic Hexahedral Wavelets on the Sphere for Angular Discretizations of the Boltzmann Transport EquationBuchan AG, Pain CC, Eaton MD, Goddard AJH and Smedley-Stevenson RP
Nuclear Science and Engineering, Taylor & Francis vol. 159 (2), 127-152.
01-06-2008
Chebyshev spectral hexahedral wavelets on the sphere for angular discretisations of the Boltzmann transport equationBuchan AG, Pain CC, Eaton MD, Smedley-Stevenson RP and Goddard AJH
Annals of Nuclear Energy, Elsevier vol. 35 (6), 1098-1108.
01-06-2008
Self-Adaptive Spherical Wavelets for Angular Discretizations of the Boltzmann Transport EquationBuchan AG, Pain CC, Eaton MD, Smedley-Stevenson RP and Goddard AJH
Nuclear Science and Engineering, Taylor & Francis vol. 158 (3), 244-263.
01-03-2008
2005
Linear and quadratic octahedral wavelets on the sphere for angular discretisations of the Boltzmann transport equationBuchan AG, Pain CC, Eaton MD, Smedley-Stevenson RP and Goddard AJH
Annals of Nuclear Energy, Elsevier vol. 32 (11), 1224-1273.
01-07-2005
Grants of specific relevance to the Centre for Intelligent Transport
Grants of specific relevance to the Centre for Intelligent Transport