High-order arbitrary Lagrangian-Eulerian discontinuous Galerkin methods for the incompressible Navier-Stokes equations. (English) Zbl 07506519
Summary: This paper develops robust discontinuous Galerkin methods for the incompressible Navier-Stokes equations on moving meshes. High-order accurate arbitrary Lagrangian-Eulerian formulations are proposed in a unified framework for both coupled as well as projection or splitting-type Navier-Stokes solvers. The framework is flexible, allows implicit and explicit formulations of the convective term, and adaptive time-stepping. The Navier-Stokes equations with ALE transport term are solved on the deformed geometry storing one instance of the mesh that is updated from one time step to the next. Discretization in space is applied to the time discrete equations so that all weak forms and mass matrices are evaluated at the end of the current time step. This design ensures that the proposed formulations fulfill the geometric conservation law automatically, as is shown theoretically and demonstrated numerically by the example of the free-stream preservation test. We discuss the peculiarities related to the imposition of boundary conditions in intermediate steps of projection-type methods and the ingredients needed to preserve high-order accuracy. We show numerically that the formulations proposed in this work maintain the formal order of accuracy of the Navier-Stokes solvers in both space and time. Moreover, we demonstrate robustness and accuracy for under-resolved turbulent flows. The implementation is based on fast matrix-free operator evaluation in order to devise computationally efficient algorithms.
MSC:
| 76Mxx | Basic methods in fluid mechanics |
| 65Mxx | Numerical methods for partial differential equations, initial value and time-dependent initial-boundary value problems |
| 76Dxx | Incompressible viscous fluids |
Keywords:
arbitrary Lagrangian-Eulerian (ALE); discontinuous Galerkin; incompressible Navier-Stokes; matrix-free methods; projection methodsReferences:
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