陈艳萍
计算数学与科学工程计算,研究方向:偏微分方程数值方法理论及其应用
个性化签名
- 姓名:陈艳萍
- 目前身份:
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学术头衔:
博士生导师
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学科领域:
计算数学
- 研究兴趣:计算数学与科学工程计算,研究方向:偏微分方程数值方法理论及其应用
陈艳萍博士,女,1963年9月生,现任湘潭大学数学与计算科学学院教授、博士生导师,数学院副院长、计算所副所长、计算数学学位点负责人、校学术委员会委员。研究领域:计算数学与科学工程计算,研究方向:偏微分方程数值方法理论及其应用。陈艳萍教授1997年获山东大学理学博士学位,同年在南京大学做博士后,1999年评为教授,2001年评为博士生导师,在长期的科研教学工作中,主要从事混合有限元高效率及高精度算法、多孔介质渗流驱动问题数值方法、奇异摄动问题的自适应移动网格方法、最优控制问题混合元自适应计算等研究工作,取得了突出的成绩。2004年度湖南省推荐享受政府特殊津贴、2004年入选教育部“新世纪优秀人才支持计划”、2002年被教育部评为“全国高等学校优秀骨干教师”、2004年获湖南省科学技术进步二等奖(排名第一)、2002年被评为湖南省计算数学学科带头人、2004年获湘潭大学优秀教师荣誉称号等等;近年来,连续主持2项国家自然科学基金项目、教育部和省教育厅重点项目和教育部首批资助骨干教师基金项目等课题研究;在“Adv.Comp. Math.”和“Int. J. Numer. Meth.Eng.”等国内外计算数学核心刊物上发表了学术论文45篇;多次应邀出国访问和在国际学术会议上做大会特邀报告。
主要研究成果:针对油藏数值模拟等应用问题,首次系统研究并证明了混合元和最小二乘混合元的最优阶收敛速度、超收敛性及后验误差估计;研究了与时间有关的非线性抛物型方程和双曲型方程混合有限元方法收敛性以及超收敛性;创造性地提出并证明了椭圆问题最小二乘混合有限元方法的超收敛性;独立提出了求解非线性问题的多层迭代校正法,首创了扩张混合元Two-Grid方法的三步格式,证明了对流扩散问题移动网格法的最佳一致收敛性;研究了最优控制问题混合有限元方法的收敛性、超收敛性、后验误差估计与自适应计算,并在状态方程具有振荡系数的情形下利用多尺度混合元方法进行收敛性分析;对流体计算中的对流占优的对流扩散问题证明了半离散与全离散移动网格迎风有限差分法的一阶收敛性。
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主页访问
4656
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0
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成果阅读
479
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成果数
7
陈艳萍, Yanping Chen*, Yunqing Huang*, Dehao Yu†
,-0001,():
-1年11月30日
We present a scheme for solving two-dimensional semilinear reaction-diffusion equations using a expanded mixed finite element method. To linearize the mixed-method equations, we use a two grid algorithms based on the Newton iteration method. The solution of nonlinear system on the fine space is reduced to the solution of two small (one linear and one nonlinear) systems on the coarse space and a linear system on the fine space. It is shown that the coarse grid can be much coarser than the fine grid and achieve asymptotically optimal approximation as long as the mesh sizes satisfy H=O (h13). As a result, solving such a large class of nonlinear equation will not be much more difficult than solving one single linearized equation.
Reaction-diffusion equations,, expanded mixed finite elements,, two-grid methods
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陈艳萍, Yanping Chen*
Journal of Computational and Applied Mathematics 159(2003)25-34,-0001,():
-1年11月30日
A singularly perturbed two-point boundary value problem with an exponential boundary layer is solved numerically by using an adaptive grid method. The mesh is constructed adaptively by equidistributing a monitor function based on the arc-length of the exact solution. The error analysis for this approach was carried out by Qiu et al. (J. Comput. Appl. Math. 101 (1999) 1-25). In this work, their error bound will be improved to the optimal order which is independent of the perturbation parameter. The main ingredient used to obtain the improved result is the theory of the discrete Green's function.
Singular perturbation, Adaptive mesh, Equidistribution principle, Uniform convergence
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【期刊论文】A POSTERIORI ERROR ESTIMATES OF MIXED METHODS FOR MISCIBLE DISPLACEMENT PROBLEMS
陈艳萍, YANPING CHEN†, WENBIN LIU‡
,-0001,():
-1年11月30日
The miscible displacement of one incompressible fluid by another in a porous medium is governed by a system of two equations. One is an elliptic equation for the pressure and the other is parabolic equation for the concentration of one of the fluids. Since the pressure appears in the concentration only through its velocity field, we choose a mixed finite element to approximate the pressure equation and for the concentration we use the standard Galerkin method. We shall obtain an explicit a posteriori error estimator in L2 (L2) for the semi-discrete scheme applied to the nonlinear coupled system.
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陈艳萍, Yanping Chen
Advances in Computational Mathematics 0: 1-16, 2004.,-0001,():
-1年11月30日
A singularly perturbed two-point boundary value problem with an exponential boundary layer is solved numerically by using an adaptive grid method. The mesh is constructed adaptively by equidistributing a monitor function based on the arc-length of the approximated solutions. A first-order rate of convergence, independent of the perturbation parameter, is established by using the theory of the discrete Green's function. Unlike some previous analysis for the fully discretized approach, the present problem does not require the conservative form of the underlying boundary value problem.
singular perturbation,, moving mesh,, rate of convergence,, error estimate
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陈艳萍, YANPING CHEN, JAN BRANDTS†, AND WENBIN LIU‡
,-0001,():
-1年11月30日
In this paper, we investigate the full discretization of general convex optimal control problems using mixed finite element methods. The state and co-state are discretized by lowest order Raviart-Thomas element and the control is approximated by piecewise constant functions. We derive error estimates for both the control and the state approximation. Moreover, we present the superconvergence analysis for mixed finite element approximation of the optimal control problems.
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陈艳萍, YANPING CHEN†, WENBIN LIU‡
,-0001,():
-1年11月30日
We study the numerical approximation of convex optimal control problems governed by elliptic partial differential equations with oscillating coefficients. Since the objective functional contains flux, we approximate the problems using the mixed finite element methods. We first analyze the standard finite element approximation schemes. Then, motivated by the numerical simulation of the primal variable and the flux in highly heterogeneous porous media, we use a mixed multiscale finite element method for solving the state equations. The multiscale finite element bases are constructed by locally solving Dirichlet boundary value problems. The analysis of the approximate control problems is carried out under the assumption that the oscillating coefficients are locally periodic, which allows us to use homogenization theory to obtain the asymptotic structure of the solutions, although the numerical schemes are designed for general cases.
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陈艳萍, YANPING CHEN†, WENBIN LIU‡
,-0001,():
-1年11月30日
In this paper, we present an a posteriori error analysis for mixed finite element approximation of convex optimal control problems. We derive a posteriori error estimates for the coupled state and control approximations under some assumptions which hold in many applications. Such estimates can be used to construct reliable adaptive mixed finite elements schemes for the control problems.
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