High-order residual distribution scheme for the time-dependent Euler equations of fluid dynamics
This work provides a novel numerical method for solving compressible flow problems, offering high-order accuracy with explicit time stepping, which is beneficial for computational fluid dynamics practitioners.
The authors developed a high-order residual distribution scheme for the time-dependent Euler equations that achieves arbitrary explicit high-order accuracy in space and time while avoiding the inversion of a large sparse mass matrix. The method was validated on 1D and 2D benchmark problems, demonstrating robustness and the theoretically predicted high order of accuracy.
In the present work, a high order finite element type residual distribution scheme is designed in the framework of multidimensional compressible Euler equations of gas dynamics. The strengths of the proposed approximation rely on the generic spatial discretization of the model equations using a continuous finite element type approximation technique, while avoiding the solution of a large linear system with a sparse mass matrix which would come along with any standard ODE solver in a classical finite element approach to advance the solution in time. In this work, we propose a new Residual Distribution (RD) scheme, which provides an arbitrary explicit high order approximation of the smooth solutions of the Euler equations both in space and time. The design of the scheme via the coupling of the RD formulation \cite{mario,abg} with a Deferred Correction (DeC) type method \cite{shu-dec,Minion2}, allows to have the matrix associated to the update in time, which needs to be inverted, to be diagonal. The use of Bernstein polynomials as shape functions, guarantees that this diagonal matrix is invertible and ensures strict positivity of the resulting diagonal matrix coefficients. This work is the extension of \cite{enumath,Abgrall2017} to multidimensional systems. We have assessed our method on several challenging benchmark problems for one- and two-dimensional Euler equations and the scheme has proven to be robust and to achieve the theoretically predicted high order of accuracy on smooth solutions.