Journal
JOURNAL OF COMPUTATIONAL PHYSICS
Volume 328, Issue -, Pages 200-220Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcp.2016.10.009
Keywords
Energy conserving discretization; Mimetic discretization; Enstrophy conserving discretization; Spectral element method; Incompressible Navier-Stokes equations
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In this work we present a mimetic spectral element discretization for the 2D incompressible Navier-Stokes equations that in the limit of vanishing dissipation exactly preserves mass, kinetic energy, enstrophy and total vorticity on unstructured triangular grids. The essential ingredients to achieve this are: (i) a velocity-vorticity formulation in rotational form, (ii) a sequence of function spaces capable of exactly satisfying the divergence free nature of the velocity field, and (iii) a conserving time integrator. Proofs for the exact discrete conservation properties are presented together with numerical test cases on highly irregular triangular grids. (C) 2016 Elsevier Inc. All rights reserved.
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