We consider structure-preserving methods for conservative systems, which rigorously replicate the conservation property yielding better numerical solutions. There, corresponding to the skew-symmetry of the differential operator, that of difference operators is essential to the discrete conservation law. Unfortunately, however, when we employ the standard central difference operator, the simplest one, the numerical solutions often suffer from undesirable spatial oscillations. In this letter, we propose a novel "average-difference method," which is tougher against such oscillations, and combine it with an existing conservative method. Theoretical and numerical analysis in the linear case show the superiority of the proposed method.
Closed-Form Projection Method for Regularizing a Function Defined by a Discrete Set of Noisy Data and for Estimating its Derivative and Fractional Derivative
Variational Convergence of Discrete Minimal Surfaces
Centre for Optimization and Approximation, University of Hamburg(汉堡大学优化与逼近中心);Institute for Numerical and Applied Mathematics, Georg-August University Göttingen(哥廷根乔治奥古斯特大学数值与应用数学研究所)
School of Mathematical Sciences, Nankai University, Tianjin, China(南开大学数学科学学院);Courant Institute, New York University, NY(纽约大学Courant研究所);School of Mathematical Sciences, Peking University, Beijing, China(北京大学数学科学学院);Beijing International Center for Mathematical Research, Center for Machine Learning Research, Peking University, Beijing, China(北京大学北京国际数学研究中心、机器学习研究中心)
Discrete variational calculus for double-bracket dissipation
University of Michigan(密歇根大学);Universidad Nacional del Sur (UNS)(国立苏尔大学);Instituto de Ciencias Matemáticas (ICMAT)(数学科学研究所);Indian Institute of Technology Bombay(印度理工学院孟买分校)
Variational integrators using forced discrete Hamiltonian systems
Universidad Nacional de Cuyo(门多萨国立大学);Instituto Balseiro(巴尔塞罗研究所);Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)(国家科学研究委员会);Universidad Nacional de La Plata(拉普拉塔国立大学);Facultad de Ingeniería Universidad Nacional de La Plata(拉普拉塔国立大学工程学院);Centro de Matemática de La Plata (CMaLP)(拉普拉塔数学中心);Facultad de Ciencias Exactas Universidad Nacional de La Plata(拉普拉塔国立大学理学院)