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An EMA-balancing, pressure-robust and Re-semi-robust reconstruction method for unsteady incompressible Navier-Stokes equations

by   Xu Li, et al.
Shandong University

Proper EMA-balance (E: kinetic energy; M: momentum; A: angular momentum), pressure-robustness and Re-semi-robustness (Re: Reynolds number) are three important properties for exactly divergence-free elements in Navier-Stokes simulations. Pressure-robustness means that the velocity error estimates are independent of the pressure approximation errors; Re-semi-robustness means that the constants in error estimates do not depend on the inverse of the viscosity explicitly. In this paper, based on the pressure-robust reconstruction method in [Linke and Merdon, Comput. Methods Appl. Mech. Engrg., 2016], we propose a novel reconstruction method for a class of non-divergence-free simplicial elements which admits all the above properties with only replacing the kinetic energy by a properly redefined discrete energy. We shall refer to it as "EMAPR" reconstruction throughout this paper. Some numerical comparisons with the exactly divergence-free methods, pressure-robust reconstruction methods and methods with EMAC formulation on classical elements are also provided.


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