全文获取类型
收费全文 | 84篇 |
免费 | 7篇 |
专业分类
力学 | 23篇 |
综合类 | 1篇 |
数学 | 25篇 |
物理学 | 42篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 4篇 |
2012年 | 5篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 2篇 |
2006年 | 4篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 9篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1989年 | 3篇 |
1984年 | 1篇 |
排序方式: 共有91条查询结果,搜索用时 15 毫秒
21.
G.R. Sonnemann V.E. Semenov 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,11(3):481-489
Stable auto-solitary solutions were found on the basis of three-dimensional numerical simulations within the simplest model
under global constraint. The model involves a diffusion equation with a nonlinear source term containing both local and non-local
nonlinearity. The source term was chosen so as to describe qualitatively the most fundamental peculiarities of discharge physics,
namely local nonlinear increase in heating and ionization rate and non-local attenuation of electric field strength with plasma
density growth. The properties of the autosolitons created by the model have been investigated employing the different parameters
as control parameter. Therefore the results of calculations can be used to construct a process of plasma contraction in gas
discharge.
Received 26 July 1999 and Received in final form 5 February 2000 相似文献
22.
Gas-kinetic schemes based on the BGK model are proposed as an alternative evolution model which can cure some of the limitations of current Riemann solvers. To analyse the schemes, simple advection equations are reconstructed and solved using the gas-kinetic BGK model. Results for gas-dynamic application are also presented. The final flux function derived in this model is a combination of a gas-kinetic Lax– Wendroff flux of viscous advection equations and kinetic flux vector splitting. These two basic schemes are coupled through a non-linear gas evolution process and it is found that this process always satisfies the entropy condition. Within the framework of the LED (local extremum diminishing) principle that local maxima should not increase and local minima should not decrease in interpolating physical quantities, several standard limiters are adopted to obtain initial interpolations so as to get higher-order BGK schemes. Comparisons for well-known test cases indicate that the gas-kinetic BGK scheme is a promising approach in the design of numerical schemes for hyperbolic conservation laws. © 1997 by John Wiley & Sons, Ltd. 相似文献
23.
Lattice Boltzmann Method is recently developed within numerical schemes for simulating a variety of physical systems. In this paper a new lattice Bhatnagar-Gross-Krook (LBGK) model for two-dimensional incompressible magnetohydrodynamics (IMHD) is presented. The model is an extension of a hydrodynamics lattice BGK model with 9 velocities on a square lattice, resulting in a model with 17 velocities. Most of the existing LBGK models for MHD can be viewed as compressible schemes to simulate incompressible flows. The compressible effect might lead to some undesirable errors in numerical simulations. In our model the compressible effect has been overcome successfully. The model is then applied to the Hartmann flow, giving reasonable results. 相似文献
24.
Jia Deng 《高等学校计算数学学报(英文版)》2012,5(2):278-296
As is known, the numerical stiffness arising from the small mean free path is one of the main difficulties in the kinetic equations. In this paper, we derive both the split and the unsplit schemes for
the linear semiconductor Boltzmann equation with a diffusive scaling.
In the two schemes, the anisotropic collision operator is realized by the "BGK"-penalty method, which is
proposed by Filbet and Jin [F. Filbet and S. Jin, J. Comp. Phys. 229(20), 7625-7648, 2010] for the kinetic equations and the related
problems having stiff sources. According to the numerical results, both of the schemes are shown to be uniformly
convergent and asymptotic-preserving. Besides, numerical evidences suggest that the unsplit scheme
has a better numerical stability than the split scheme. 相似文献
25.
MA Chang-Feng SHI Bao-Chang CHEN Xing-Wang 《理论物理通讯》2005,44(5):917-920
Lattice Boltzmann Method is recently developed within numerical schemes for simulating a variety of physical systems. In this paper a new lattice.Bhatnagar-Gross-Krook (LBGK) model for two-dimensional incompressible magnetohydrodynamics (IMHD) is presented. The model is an extension of a hydrodynamics lattice BGK model with 9 velocities on a square lattice, resulting in a model with 17 velocities. Most of the existing LBGK models for MHD can be viewed as compressible schemes to simulate incompressible flows. The compressible effect might lead to some undesirable errors in numerical simulations. In our model the compressible effect has been overcome successfully. The model is then applied to the Hartmann flow, giving reasonable results. 相似文献
26.
27.
Numerical methods for the Baer–Nunziato model of compressible two‐phase flow have attracted much attention in recent years. In this paper, a two‐phase Bhatnagar–Gross–Krook (BGK) model is constructed in which the non‐conservative terms in the Baer–Nunziato model are considered as the external forces and the collisions both with particles of their phases and other phases are taken into consideration. On the basis of this BGK model, the so‐called modified Baer–Nunziato model is derived and a gas‐kinetic scheme for this modified model is presented. The distribution functions are constructed at the cell interface based on the integral solutions of the BGK equations for both phases. Then, numerical fluxes can be obtained by taking moments of the distribution functions, and non‐conservative terms are explicitly introduced into the construction of numerical fluxes. In this method, not only the iterative processes in the exact Riemann solvers are eliminated but also the collisions with the particles of other phases are taken into account. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
28.
In the present paper the rarefied gas flow caused by the sudden change of the wall temperature and the Rayleigh problem are
simulated by the DSMC method which has been validated by experiments both in global flow field and velocity distribution function
level. The comparison of the simulated results with the accurate numerical solution of the B-G-K model equation shows that
near equilibrium the B-G-K equation with corrected collision frequency can give accurate result but as farther away from equilibrium
the B-G-K equation is not accurate. This is for the first time that the error caused by the B-G-K model equation has been
revealed.
The project supported by the National Natural Science Foundation of China (19772059, 19889209) 相似文献
29.
用BGK格式计算不可压缩流场 总被引:5,自引:0,他引:5
简要介绍BGK方法的基本思想,数值方法及其对不可压缩流场数值计算的推广。然后详细介绍将BGK方法应用于平面方框流的结果,将其结果与Ghia的结果进行了详细的比较。本方法还用来模拟后台阶流动,所得结果与相应的实验数据进行比较。以上比较表明本方法的有效性,同时也确定在计算不可压缩流体时参数的正确选择。 相似文献
30.
O. V. Il’in 《Computational Mathematics and Mathematical Physics》2009,49(5):867-880
The stability of the plane Couette flow is studied using the simplified Boltzmann equation (the BGK equation) in which the high modes in the space of velocities and coordinates are truncated. The solution to the Navier-Stokes equation with small additional terms depending on the Knudsen number is used as the stationary solution. We assume that the perturbations depend only on the coordinate that is orthogonal to the flow. The density perturbations are assumed to be nonzero. In this approximation, the problem is found to be unstable in the case of small Knudsen numbers. 相似文献