Advances in Numerical Methods for Partial Differential Equations

The field of numerical methods for partial differential equations is witnessing significant developments, with a focus on designing innovative schemes that can efficiently handle complex problems. Researchers are exploring new approaches to ensure positivity preservation, high-order accuracy, and energy dissipation in various numerical methods, including direct discontinuous Galerkin schemes and exponential time differencing Runge-Kutta methods. Moreover, there is a growing interest in applying these methods to real-world problems, such as chemotaxis-Navier-Stokes systems and ideal magnetohydrodynamics. Noteworthy papers in this area include the development of a positivity-preserving hybrid DDG method for Poisson-Nernst-Planck systems, which ensures rigorous positivity preservation and high-order accuracy. Another significant contribution is the introduction of a comprehensive finite element approximation framework for three-dimensional Landau-de Gennes Q-tensor energies for nematic liquid crystals, which demonstrates optimal order convergence rate in the energy norm.

Sources

A positivity-preserving hybrid DDG method for Poisson--Nernst--Planck systems

Numerical methods for fully nonlinear degenerate diffusions

Nonsmooth data error estimates for exponential Runge--Kutta methods and applications to split exponential integrators

Newtonian potentials of Legendre polynomials on rectangles have displacement structure

Time discretization of a semi-discrete scheme for 3D Chemotaxis-Navier-Stokes system driven by transport noise

Convergence Analysis of Virtual Element Methods for the Sobolev Equation with Convection

Exponential Time Differencing Runge-Kutta Discontinuous Galerkin (ETD-RKDG) Methods for Nonlinear Degenerate Parabolic Equations

Numerical solution of the wave equation outside a sphere

Active flux for ideal magnetohydrodynamics: A positivity-preserving scheme with the Godunov-Powell source term

Numerical analysis for constrained and unconstrained Q-tensor energies for liquid crystals

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