Time Domain Spectral Element Method Analysis Of Coupling Effects Of Plasma Sheath Multiphysics

When a hypersonic vehicle is flying at hypersonic velocity in a thin atmosphere,a layer of plasma sheaths with strong ionization are generated around the vehicle,which affects the navigation and positioning of the vehicle and data communication,and even causes signal interruption in severe cases.Also known as the radio communication blackout phenomenon.Studying the propagation characteristics of electromagnetic waves in the plasma sheath is of great significance to the correct understanding and mitigation of the blackout problem.In this paper,a numerical model of coupling fluid equation with poisson equation is established by using the influence mechanism of static electromagnetic field on particles in plasma flow field.The electron density distribution in plasma flow field with different applied voltage and applied magnetic field is studied by using time domain spectral element method,and the simulation of the weakening of electron density by external magnetic field is realized by using implicit iteration.Furthermore,in the case of transient high power electromagnetic wave irradiation,the traditional Drude model can not consider the nonlinear effect caused by high power.The numerical model of coupling fluid equation with maxwell equation is introduced in this paper.The necessity of coupling model is verified by example simulation.In summary,the multi-physical field coupling three-dimensional simulation model of electromagnetic field and plasma flow field is established in this paper for static and transient conditions,and the theoretical model of interaction between electromagnetic wave and plasma sheath is improved to a certain extent.