Physical Investigation of Plasma Dynamic Behavior Based on Numerical Simulation
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Abstract
Taking low-temperature industrial plasma as the research object, this paper constructs a two-dimensional axisymmetric simulation model based on the coupling theory of magnetohydrodynamics (MHD) and particle-in-cell (PIC) simulation, completes grid and time step independence verification as well as physical conservation check, and carries out numerical simulation studies under multiple working conditions. Combined with simulation data, this paper systematically analyzes the spatiotemporal evolution laws of plasma density, temperature, electromagnetic field and velocity field, and divides three typical stages: initial equilibrium, disturbance development and steady-state evolution. The regulatory effects of initial particle parameters, background magnetic field and boundary conditions on plasma dynamic characteristics are explored, and the steady-state performance and fluctuation characteristics of plasma under different magnetic field intensities are quantified. On this basis, the physical mechanism of plasma instability induced by gradient coupling mismatch is revealed, the saturation mechanism of disturbance energy dissipation and field constraint potential energy balance is clarified, and the transport composition of particles and energy is split and quantified. The research results verify the effectiveness of the hybrid simulation scheme, and the obtained evolution laws and physical mechanisms can provide theoretical reference and data support for parameter optimization and stability control of low-temperature plasma devices.
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