Evaluation of Turbulence Model for Implicit Large Eddy Simulation in External Aerodynamics

Abstract

This work analyzes the performance of an implicit large eddy simulation (ILES) turbulence model implemented using adaptive mesh refinement based on an estimation of local flow scales. In the first instance, the local filter definition criteria, implemented in the computational fluid dynamics platform called Basilisk, are described. Then, three case studies are proposed to evaluate the developed method. First, a two-dimensional airfoil case is analyzed to analyze the development of turbulent boundary layers. The second case consists of an isotropic turbulence problem, to analyze the preservation of the behavior of the resolved scales by comparing the proposed implicit large vortex simulation strategy with direct numerical simulation (DNS) results. The last case analyzed corresponds to a geometry of higher complexity, related to the external aerodynamics of vehicles. From the results obtained, appropriate filter values are determined to capture a given range of turbulence scales.