共查询到20条相似文献,搜索用时 0 毫秒
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本文提出了一个试探函数不满足divν=0的定常Stokes方程的窄边四边形有限元法,利用窄边四边形等参有限元插值定理和Falk的思想,得到了H^1(Ω)模误差的最优收敛估计阶O(h)。 相似文献
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Hong-xing Rui 《应用数学学报(英文版)》2005,21(3):359-372
Finite volume element method for the Stokes problem is considered. We use a conforming piecewise linear function on a fine grid for velocity and piecewise constant element on a coarse grid for pressure. For general triangulation we prove the equivalence of the finite volume element method and a saddle-point problem, the inf-sup condition and the uniqueness of the approximation solution. We also give the optimal order H^1 norm error estimate. For two widely used dual meshes we give the L^2 norm error estimates, which is optimal in one case and quasi-optimal in another ease. Finally we give a numerical example. 相似文献
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Stokes问题非协调混合有限元超收敛分析 总被引:3,自引:0,他引:3
本文通过引入全新的技巧,研究了Stokes问题的非协调混合有限元方法,得到了关于速度与压力的超逼近性质.进一步地通过构造一个恰当的插值后处理算子,还得到了关于速度的整体超收敛结果. 相似文献
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Petr Knobloch 《Numerical Functional Analysis & Optimization》2013,34(2):161-187
ABSTRACT If finite element spaces for the velocity and pressure do not satisfy the Babu?ka-Brezzi condition, a stable conforming discretization of the Stokes or Navier-Stokes equations can be obtained by enriching the velocity space by suitable functions. Writing any function from the enriched space as a sum of a function from the original space and a function from the supplementary space, the discretization will contain a number of additional terms compared with a conforming discretization for the original pair of spaces. We show that not all these terms are necessary for the solvability of the discrete problem and for optimal convergence properties of the discrete solutions, which is useful for saving computer memory and for establishing a connection to stabilized methods. 相似文献
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讨论了拟线性对流占优扩散问题的数值模拟.对对流部分采用特征线格式进行离散,以消除流动锋线前沿的数值弥散现象,保证格式的稳定性;而对扩散部分采用扩展混合有限元方法,同时逼近未知函数,未知函数的梯度及伴随向量函数.理论分析和数值算例表明,此方法是稳定的,具有最优L2逼近精度. 相似文献
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Stokes型积分微分方程的质量集中各向异性非协调有限元分析 总被引:2,自引:0,他引:2
本文将Crouzeix-Raviart型非协调三角形元应用到发展型Stokes积分微分方程,给出了其质量集中非协调有限元逼近格式.在各向异性网格下,导出了速度的L2模和能量模及压力的L2模的误差估计. 相似文献
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讨论了一类伪双曲型方程的一个H1-Galerkin非协调混合有限元方法.利用插值算子的特殊性质,在半离散和全离散格式下,得到了与传统混合有限元相同的误差估计且不需要满足LBB条件. 相似文献
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Hou-De Han 《计算数学(英文版)》1987,5(2):135-143
In this paper, a new finite element scheme for Navier-Stokes equations is proposed, in which three different partitions (in the two dimensional case) are used to construct finite element subspaces of the velocity field and the pressure. The error estimate of the finite element than approximation is given. The precision of this new scheme has the same order as the scheme $Q_2/P_0$, but it is more economical that the scheme $Q_2/P_0$. 相似文献
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本文建议了一种用于分析Stokes流动的罚-杂交变分原理,其中,偏应力张量和静水压力事先满足线动量平衡.建立了相应的有限元模型.由此,压力可在列式过程中消去,使得有限元矩阵方程仅以节点速度作为唯一的求解未知量.推导了几种4-节点和8-节点四边形单元.通过数值算例,显示了单元性能. 相似文献
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AMS (MOS): 45E05, 65R20, 45L05, 47D25 This paper presents a finite element collocation method for bisingular integral equations with continuous coefficients on the torus. The convergence properties of this method are proved by using a local principle and Banach algebra techniques. 相似文献
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A primal hybrid finite element scheme is introduced to produce completely discontinuous solution for diffusion and convection-diffusion problems. Same rate of convergence as classical methods is obtained in suitable norms. Finally an a posteriori error estimator is given. 相似文献
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非线性抛物积分微分方程的各向异性有限元高精度分析 总被引:5,自引:0,他引:5
本文讨论非线性抛物积分微分方程的各向异性有限元方法.在不引入真解的H1-Volterra投影的情况下得到了半离散格式下的整体超收敛. 相似文献
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