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| Paper: |
Characteristic Boundary Conditions for Numerical Magnetohydrodynamic (MHD) Simulation of Solar and Laboratory Plasma Flows |
| Volume: |
429, Numerical Modeling of Space Plasma Flows, Astronum-2009 |
| Page: |
294 |
| Authors: |
Wu, S. T.; Wang, A. H.; Cassibry, J. |
| Abstract: |
We discuss the self-consistent time-dependent numerical boundary conditions for magnetohydrodynamic (MHD) simulation to
study the solar and laboratory plasma dynamics. It is well known that these plasma flows cover from the sub-sonic and
sub-Alfvénic to super-sonic and super-Alfvénic region. Mathematically, the set of governing differential
equations is transited from elliptical to hyperbolic type. In order to assure self-consistency, characteristic
boundary conditions need to be used because the information propagating according to these characteristics will
affect the solutions inside the computational domain. To illustrate the importance of the characteristic boundary
conditions, two examples are given; one for solar plasma which is to study the energy and magnetic flux from the
sub-photosphere to the corona, and the other one concerns laboratory plasma flow for the investigation of
sub-Alfvénic inlet boundary conditions of an MHD nozzle flow. |
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