کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6928562 1449340 2018 42 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Conservative fourth-order finite-volume Vlasov-Poisson solver for axisymmetric plasmas in cylindrical (r,vr,vθ) phase space coordinates
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
Conservative fourth-order finite-volume Vlasov-Poisson solver for axisymmetric plasmas in cylindrical (r,vr,vθ) phase space coordinates
چکیده انگلیسی
A fourth-order finite-volume Vlasov-Poisson algorithm is developed for simulating axisymmetric plasma configurations in (r,vr,vθ) phase space coordinates. The Vlasov equation for cylindrical phase space coordinates is cast into conservation-law form and is discretized on a structured grid. The conservative finite-volume discretization is based on fifth-order upwind reconstructions of the distribution function and a fourth-order quadrature rule that accounts for transverse variations of fluxes along control volume surfaces. High-order specular reflection boundary conditions enable high-fidelity treatment of plasma distribution functions at the axis and at wall boundaries. The numerical method is applied to simulate a confined uniform neutral gas to assess convergence properties for an equilibrium system in which effects of finite-temperature and acceleration due to centrifugal and Coriolis forces are present. The discretization is also applied to a Z-pinch configuration to study electrostatic ion confinement and the dynamics of the associated breathing mode. Simulations show that the ion distribution function exhibits non-Maxwellian features and that a temperature anisotropy develops and is sustained. The finite-volume implementation is demonstrated to converge at fourth-order for both applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 373, 15 November 2018, Pages 877-899
نویسندگان
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