Towards Industrial Les Using High Order Discontinous Galerkin Method

This presentation was made at NAFEMS UK Conference 2018, Taking Engineering Analysis and Simulation to the Next Level".

The NAFEMS UK Conference 2018 brought together all those involved in analysis and simulation from every corner of industry and academia, giving them an opportunity to advance their knowledge, give their organisations a competitive advantage, and a chance to be part of improving the technology itself.

Resource Abstract

Solving the unsteady compressible Navier-Stokes (NS) equations is a powerful method to investigate acoustic characteristics of fluid flows. A large overlap exists between methods involved in Computational Aeroacoustics (CAA) and those in traditional Computational Fluid Dynamics (CFD). In fact, sound generation and propagation phenomena are, in principle, already embodied in the fluid dynamics conservation equations, and can therefore, be resolved together with the flow evolution itself. The approach by which noise predictions are to be directly computed from accurate, scale-resolved CFD simulations is addressed in literature as Direct Noise Computation (DNC).

Several industrial sectors continuously focus on improving the aerodynamic characteristics of various configurations for increased fuel efficiency and drag reduction. At both high and low speeds, the flow generated by various applications (automotive and aerospace), feature complex flow structures downstream of components such high lift configurations, cavities, mirrors and antennas. These structures lead to pressure wave propagation, turbulent fluid flow and multiple nonlinear interactions at different scales. Many of the design studies for external aerodynamics use CFD as a primary tool for investigation in order to reduce the cost when compared with the experimental data.

With the latest advances in numerics, high order methods have become popular among scientists and engineers to investigate turbulent flows. The most widely used are the high order DG (Discontinuous Galerkin) based methods introduced for the first time by Reed and Hill (1973). FR, Huynh (2007), can be considered as a generalisation of many high order methods, including DG, and has been applied to solve the compressible Navier-Stokes equations (see Witherden et al. (2004)).

In this work we present a potential candidate for addressing some of the issues related to the next generation of CFD solvers in targeting industrial LES at scale for external aerodynamics and aeroacoustic problems. The results are presented based on applications such as transonic cavity flows, vehicle mirrors and aircraft high lift configurations.

Document Details

ReferenceC_Jul_18_UK_27
AuthorCimpoeru. A
LanguageEnglish
TypePresentation
Date 17th July 2018
OrganisationCFMS Services Ltd
RegionUK

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