Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
A NUMERICAL STUDY ON 2D SPATIAL MIXING LAYERS USING SPECTRAL/HP METHODS: INSIGHTS ON HOW MESH REFINEMENT AFFECTS FLOW STATISTICS
Submission Author:
Daniel Garcia-Ribeiro , SP
Co-Authors:
Daniel Garcia-Ribeiro, Vinicius Malatesta, Rodrigo Costa Moura
Presenter: Daniel Garcia-Ribeiro
doi://10.26678/ABCM.COBEM2023.COB2023-0611
Abstract
High-fidelity simulations of turbulent flows have been becoming more feasible in the last years mainly due to the increase of computational power. In this context, the present paper reports results of high-fidelity simulations of a 2D spatial mixing layer. The simulations are achieved by the implicit Large Eddy Simulation (iLES) methodology, or also called as under-resolved Direct Numerical Simulation (uDNS), and the high-order method Continuous Galerkin with the Gradient-Jump penalty stabilization technique are used to simulate the incompressible 2D Navier-Stokes equations and a passive scalar equation. The simulations were started with a hyperbolic tangent profile for the u-velocity and a step profile for the passive scalar. The passive scalar field was resolved in order to observe the mixing between the two fluid layers, which used the same value of the kinematic viscosity as diffusion coefficient (unit Schmidt number). All simulations reported here were run in the open source Nektar++ platform for a Reynolds number, based on the initial momentum thickness, equal to 1000 and provided consistent and expected results for the flow field. These results have been obtained at different levels of mesh refinement and showed an acceptable level of variability due to a slow convergence of flow statistics.
Keywords
mixing layer, scalar mixing, Implicit LES, high-order simulation, CFD
