Finite-difference schemes for anisotropic diffusion

B van Es, B Koren, HJ de Blank - Journal of Computational Physics, 2014 - Elsevier
In fusion plasmas diffusion tensors are extremely anisotropic due to the high temperature
and large magnetic field strength. This causes diffusion, heat conduction, and viscous …

An asymptotic-preserving semi-Lagrangian algorithm for the time-dependent anisotropic heat transport equation

L Chacon, D del-Castillo-Negrete, CD Hauck - Journal of Computational …, 2014 - Elsevier
We propose a semi-Lagrangian numerical algorithm for a time-dependent, anisotropic
temperature transport equation in magnetized plasmas in regimes with negligible variation …

Comparison of numerical solvers for anisotropic diffusion equations arising in plasma physics

N Crouseilles, M Kuhn, G Latu - Journal of Scientific Computing, 2015 - Springer
This work is devoted to the comparison of numerical schemes to approximate anisotropic
diffusion problems arising in tokamak plasma physics. We focus on the spatial …

A new conservative finite-difference scheme for anisotropic elliptic problems in bounded domain

JA Soler, F Schwander, G Giorgiani, J Liandrat… - Journal of …, 2020 - Elsevier
Highly anisotropic elliptic problems occur in many physical models that need to be solved
numerically. A direction of dominant diffusion is thus introduced (called here parallel …

First order hyperbolic approach for anisotropic diffusion equation

AS Chamarthi, H Nishikawa, K Komurasaki - Journal of Computational …, 2019 - Elsevier
In this paper, we present a high order finite difference solver for anisotropic diffusion
problems based on the first-order hyperbolic system method. In particular, we demonstrate …

Asymptotic Preserving scheme for strongly anisotropic parabolic equations for arbitrary anisotropy direction

J Narski, M Ottaviani - Computer Physics Communications, 2014 - Elsevier
This paper deals with the numerical study of a strongly anisotropic heat equation. The use of
standard schemes in this situation leads to poor results, due to high anisotropy. Furthermore …

An asymptotic preserving method for strongly anisotropic diffusion equations based on field line integration

M Tang, Y Wang - Journal of Computational Physics, 2017 - Elsevier
In magnetized plasma, the magnetic field confines the particles around the field lines. The
anisotropy intensity in the viscosity and heat conduction may reach the order of 10 12. When …

Highly anisotropic nonlinear temperature balance equation and its numerical solution using asymptotic-preserving schemes of second order in time∗

A Lozinski, J Narski, C Negulescu - ESAIM: Mathematical Modelling …, 2014 - cambridge.org
This paper deals with the numerical study of a nonlinear, strongly anisotropic heat equation.
The use of standard schemes in this situation leads to poor results, due to the high …

Uniformly convergent scheme for strongly anisotropic diffusion equations with closed field lines

Y Wang, W Ying, M Tang - SIAM Journal on Scientific Computing, 2018 - SIAM
In magnetized plasma, the magnetic field confines particles around field lines. The ratio
between the intensity of the parallel and perpendicular viscosities or heat conductions may …

Anisotropic diffusion in toroidal geometries

A Ratnani, E Franck, B Nkonga, A Eksaeva… - ESAIM: Proceedings …, 2016 - esaim-proc.org
In this work, we present a new finite element framework for toroidal geometries based on a
tensor product description of the 3D basis functions. In the poloidal plan, different …