A numerical study of partially ionised plasma using a 2D two-fluid magnetohydrodynamic code

In a magnetised, partially ionised plasma, such as the lower solar atmosphere, the co-existence of both charged and neutral particles and their interaction lead to effects that do not occur in fully ionised plasma. Multi-fluid magnetohydrodynamic (MHD) models of a plasma account for the degree of ionisation and the resulting effects more accurately than common single-fluid MHD models. A 2D two-fluid MHD code has been developed (writ-ten in C++) to study partially ionised plasma, based on the Kurganov-Tadmor scheme. The advantage of this scheme is that it is Riemann-solver free, which makes computation faster, and it exhibits a small, time step independent numerical viscosity, which makes the code stable and accurate for much smaller time steps than usual schemes allow for. The explicit Euler and fourth-order Runge-Kutta scheme are implemented to integrate the solution in time. Furthermore, the implementation of a spatial domain decomposition scheme, which is based on Message Passing Interface (MPI) standard, allows for parallel computing. The code has been verified successfully and a number of tests were per-formed, such as the Sod-shock tube test and the Brio-Wu shock test. Moreover, the effect of ionisation and recombination on a magnetised, partially ionised plasma was investi-gated by studying a 1.5D slow-mode shock simulation and the 2D Orszag-Tang vortex simulation. The effect on the properties of both fluids, the ionised and the neutral fluid, are compared to simulations where collisions are the only coupling mechanism between the fluids. In the initialisation, the two simulations are fundamentally different; whereas the driver of the slow-mode shock formation is the discontinuity in the magnetic field, it is the velocity field that predominantly drives the vortex formation in the Orszag-Tang vortex simulation. However, for both, it was found that the movement of the ionised fluid decreases as well as the shock speeds when ionisation and recombination are included. The partial ionisation state of the plasma adds complexity to the numerical modelling of the solar atmosphere and so multi-fluid codes have long been ignored. Therefore, the code developed here provides a tool to unlock new investigations into the lower solar atmosphere and will allow new physics on the Sun to be explored

Aeronautical engineering: A continuing bibliography with indexes (supplement 295)

This bibliography lists 581 reports, articles, and other documents introduced into the NASA Scientific and Technical Information System in Sep. 1993. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment, and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

Bibliography of Lewis Research Center technical publications announced in 1992

This compilation of abstracts describes and indexes the technical reporting that resulted from the scientific and engineering work performed and managed by the Lewis Research Center in 1992. All the publications were announced in the 1992 issues of STAR (Scientific and Technical Aerospace Reports) and/or IAA (International Aerospace Abstracts). Included are research reports, journal articles, conference presentations, patents and patent applications, and theses

Aeronautical engineering: A continuing bibliography with indexes (supplement 267)

This bibliography lists 661 reports, articles, and other documents introduced into the NASA scientific and technical information system in June, 1991. Subject coverage includes design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; theoretical and applied aspects of aerodynamics and general fluid dynamics; electrical engineering; aircraft control; remote sensing; computer sciences; nuclear physics; and social sciences

Aeronautical engineering: A continuing bibliography with indexes (supplement 240)

This bibliography lists 629 reports, articles, and other documents introduced into the NASA scientific and technical information system in May, 1989. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

Aeronautical engineering: A continuing bibliography with indexes (supplement 270)

This bibliography lists 600 reports, articles, and other documents introduced into the NASA scientific and technical information system in September, 1991. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

Aeronautical engineering: A continuing bibliography with indexes (supplement 246)

This bibliography lists 690 reports, articles, and other documents introduced into the NASA scientific and technical information system in November, 1989. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

FAA Center of Excellence for Alternative Jet Fuels & Environment: Annual Technical Report 2021: For the Period October 1, 2020 - September 30, 2021: Volume 2

FAA Award Number 13-C.This report covers the period October 1, 2020, through September 30, 2021. The Center was established by the authority of FAA solicitation 13-C-AJFE-Solicitation. During that time the ASCENT team launched a new website, which can be viewed at ascent.aero. The next meeting will be held April 5-7, 2022, in Alexandria, VA