Cell-vertex discretization of shallow water equations on mixed unstructured meshes


Contact
Sergey.Danilov [ at ] awi.de

Abstract

Finite-volume discretizations can be formulated on unstructured meshes composed of different polygons. A staggered cell-vertex finite-volume discretization, keeping the velocity degree of freedom on cell centroids and scalar degrees of freedom on vertices presents one possible choice. Its performance is analyzed on mixed meshes composed of triangles and quads. Although triangular meshes are most flexible geometrically, quads are more efficient numerically and do not support spurious inertial modes of the triangular cell-vertex discretization. Mixed meshes composed of triangles and quads combine benefits of both. In particular, triangular transitional zones can be used to join quadrilateral meshes of differing resolution, i. e., to provide smooth nesting of a fine mesh into a coarse one. Based on a set of examples involving shallow water equations it is shown that mixed meshes offer a viable approach provided some background biharmonic viscosity (or the biharmonic filter) is used to stabilize the triangular part of the mesh.



Item Type
Conference (Talk)
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
EGU General Assembly, 12 Apr 2015 - 17 Apr 2015, Vienna.
Eprint ID
37892
Cite as
Danilov, S. and Androsov, A. (2015): Cell-vertex discretization of shallow water equations on mixed unstructured meshes , EGU General Assembly, Vienna, 12 April 2015 - 17 April 2015 .


Share

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item