Based on the auxiliary subspace techniques,a posteriori error estimator of nonconforming weak Galerkin finite element method(WGFEM)for Stokes problem in two and three dimensions is presented.Without saturation assumpt...Based on the auxiliary subspace techniques,a posteriori error estimator of nonconforming weak Galerkin finite element method(WGFEM)for Stokes problem in two and three dimensions is presented.Without saturation assumption,we prove that the WGFEM approximation error is bounded by the error estimator up to an oscillation term.The computational cost of the approximation and the error problems is considered in terms of size and sparsity of the system matrix.To reduce the computational cost of the error problem,an equivalent error problem is constructed by using diagonalization techniques,which needs to solve only two diagonal linear algebraic systems corresponding to the degree of freedom(d.o.f)to get the error estimator.Numerical experiments are provided to demonstrate the effectiveness and robustness of the a posteriori error estimator.展开更多
We develop two parallel algorithms progressively based on C＋＋ to compute a triangle operator problem, which plays an important role in the study of Schubert calculus. We also analyse the computational complexity of ...We develop two parallel algorithms progressively based on C＋＋ to compute a triangle operator problem, which plays an important role in the study of Schubert calculus. We also analyse the computational complexity of each algorithm by using combinatorial quantities, such as the Catalan number, the Motzkin number, and the central binomial coefficients. The accuracy and efficiency of our algorithms have been justified by numerical experiments.展开更多
基金the Natural Science Foundation of Jiangsu Province(No.BK20210540)the Natural Science Foundation of The Jiangsu Higher Education Institutions of China(No.21KJB110015)the National Key Research and Development Program of China(grant no.2020YFA0713601).
文摘Based on the auxiliary subspace techniques,a posteriori error estimator of nonconforming weak Galerkin finite element method(WGFEM)for Stokes problem in two and three dimensions is presented.Without saturation assumption,we prove that the WGFEM approximation error is bounded by the error estimator up to an oscillation term.The computational cost of the approximation and the error problems is considered in terms of size and sparsity of the system matrix.To reduce the computational cost of the error problem,an equivalent error problem is constructed by using diagonalization techniques,which needs to solve only two diagonal linear algebraic systems corresponding to the degree of freedom(d.o.f)to get the error estimator.Numerical experiments are provided to demonstrate the effectiveness and robustness of the a posteriori error estimator.
基金The authors sincerely appreciate the referees for acknowledging the manuscript and providing valuable comments and suggestions that benefit their manuscript. This work was supported by the National Natural Science Foundation of China （Grant Nos. 11131008, 11271157, 11201453, 11471141）, the 973 Program （2011CB302400）, the Open Project Program of the State Key Lab of CAD＆CG （A1302） of Zhejiang University, and the Scientific Research Foundation for Returned Scholars, Ministry of Education of China. They also wish to thank the High Performance Computing Center of Jilin University and Computing Center of Jilin Province for essential computing support.
文摘We develop two parallel algorithms progressively based on C＋＋ to compute a triangle operator problem, which plays an important role in the study of Schubert calculus. We also analyse the computational complexity of each algorithm by using combinatorial quantities, such as the Catalan number, the Motzkin number, and the central binomial coefficients. The accuracy and efficiency of our algorithms have been justified by numerical experiments.
