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Multidimensional Numerical Simulation of Glow Discharge by Using the N-BEE-Time Splitting Method
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作者 Benyssaad KRALOUA Ali HENNAD 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第9期802-807,共6页
In this work, a new numerical technique is proposed for the resolution of a fluid model based on three Boltzmann moments. The main purpose of this technique is to calculate electric and physical properties in the non-... In this work, a new numerical technique is proposed for the resolution of a fluid model based on three Boltzmann moments. The main purpose of this technique is to calculate electric and physical properties in the non-equilibrium electric discharge at low pressure. The transport and Poisson's equations form a self-consistent model. This equation system is written in cylindrical coordinates following the geometric shape of a plasma reactor. Our transport equation system is discretized using the finite volume approach and resolved by the N-BEE explicit scheme coupled to the time splitting method. This programming structure reduces computation time considerably. The 2D code is carried out and tested by comparing our results with those found in literature. 展开更多
关键词 2D cylindrical fluid glow discharge N-BEE scheme time splitting method
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Computational Methods for Three Coupled Nonlinear Schrödinger Equations 被引量:3
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作者 M. S. Ismail S. H. Alaseri 《Applied Mathematics》 2016年第17期2110-2131,共23页
In this work, we will derive numerical schemes for solving 3-coupled nonlinear Schr&ouml;dinger equations using finite difference method and time splitting method combined with finite difference method. The result... In this work, we will derive numerical schemes for solving 3-coupled nonlinear Schr&ouml;dinger equations using finite difference method and time splitting method combined with finite difference method. The resulting schemes are highly accurate, unconditionally stable. We use the exact single soliton solution and the conserved quantities to check the accuracy and the efficiency of the proposed schemes. Also, we use these methods to study the interaction dynamics of two solitons. It is found that both elastic and inelastic collision can take place under suitable parametric conditions. We have noticed that the inelastic collision of single solitons occurs in two different manners: enhancement or suppression of the amplitude. 展开更多
关键词 Three Coupled Nonlinear Schrodinger Equations Finite Difference method time splitting method Interaction of Solitons
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NUMERICAL SIMULATIONS OF EVOLUTIONS FROM WALL PULSE TO TURBULENT COHE RENT STRUCTURES
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作者 张立 唐登斌 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2003年第1期17-22,共6页
The high order compact d if ference method is developed for solving the perturbation equations based on Navi er Stokes equations, and is used in studying complex evolution processes from w all negative pulse to the ... The high order compact d if ference method is developed for solving the perturbation equations based on Navi er Stokes equations, and is used in studying complex evolution processes from w all negative pulse to the turbulent coherent structure in the channel flow. Th is method contains three dimensional coupling difference scheme with high accur acy and high resolution, and the high order time splitting methods. Compared with the general spectral method, the method can be used to research turbule nt coherent structure under more general boundary conditions and in flow domains . In this paper, the generation and evolution of the turbulent coherent structur es ind uced by wall pulse in the channel flow are simulated, and the basic characterist ics and rules of the turbulent coherent structure are shown. Computational r esults indicate that a wall negative pulse is more convenient than the resonant three wave model. 展开更多
关键词 coherent structure TURBULENCE Navier Stokes equations three dimensional coupling difference sc heme high order time splitting method
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Simulation and characteristics analysis of a wavefield in a thermoelastic medium adopting the rotated staggered-grid pseudospectral method and L-S theory 被引量:2
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作者 Yuanxie LI Cai LIU +4 位作者 Zhiqi GUO Yang LIU Xuan FENG You TIAN Qi LU 《Science China Earth Sciences》 SCIE EI CSCD 2021年第8期1390-1408,共19页
The simulation of wave propagation in high-temperature media requires thermoelastic theory.In this paper,we apply the rotated-staggered-grid pseudo-spectral method(RSG-PSM)to solving thermoelastic governing equations ... The simulation of wave propagation in high-temperature media requires thermoelastic theory.In this paper,we apply the rotated-staggered-grid pseudo-spectral method(RSG-PSM)to solving thermoelastic governing equations based on L-S theory.A time splitting method is used to solve the stiffness problem of the equations,and we introduce the rotated staggered pseudo-spectral operator and centered pseudo-spectral operator to compute the first-order spatial derivatives and second-order spatial derivatives,respectively.In the case of the heterogeneous-medium model,the Crank-Nicolson explicit method is used instead of the pseudo-spectral method to compute the wavefield.The properties and propagation of the thermal coupled wavefield are discussed,and we compare the simulation results obtained using the pseudo-spectral method,staggered-grid pseudo-spectral method,and RSG-PSM.In the case of an isotropic homogeneous medium,we obtain stable and highly accurate results using the time splitting method combined with the RSG-PSM.However,the algorithm cannot be applied with a large time step when the thermal conductivity changes dramatically,and the algorithm is unstable when the reference temperature has a gradient distribution.The optimal combined application of the mesh generation mode and numerical algorithm is explored,laying a foundation for the extension of these methods to thermoporoelasticity,thermoviscoelasticity,and anisotropy. 展开更多
关键词 Thermoelastic wave L-S theory Rotated-staggered-grid pseudo-spectral method Seismic wavefield simulation time splitting method
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