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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

APPLICATION OF A DYNAMIC LES MODEL WITH AN H-ADAPTIVE FEM FOR FLUID AND THERMAL PROCESSES

DOI: 10.1615/TFESC1.cmd.013842
pages 329-335

Jiajia Waters
Los Alamos National Laboratory, T-3 Fluid Dynamics and Solid Mechanics

Darrell W. Pepper
NCACM, Department of Mechanical Engineering, University of Nevada Las Vegas, Las Vegas, NV 89154, USA

David Carrington
Los Alamos National Laboratory, T-3 Fluid Dynamics and Solid Mechanics


KEY WORDS: Dynamic LES, h-adaptive FEM, flow over a cylinder

Abstract

A dynamic Large Eddy Simulation (LES) Predictor-Corrector Split (PCS) h-adaptive Finite Element Method (FEM) for solving both incompressible and compressible flows has been developed. This particular PCS h-adaptive FEM makes it possible to solve both incompressible and compressible flows in one numerical system. Development of the PCS formulation is well described in Carrington et al [1]. The additional effort to incorporate an LES turbulent model with PCS h-adaptive FEM was needed to more accurately account for turbulence modeling capabilities. In our formulation, the Vreman dynamic LES approach by Lau [2] is able to solve compressible and incompressible fluid flow without any wall damping function or ad-hoc clipping to prevent an unstable (negative) eddy viscosity, unlike the Smagorinsky subgrid model (SM). The underlying discretization is an h-adaptive finite element formulation for the general flow momentum transport equation along with other transport equations for multiphase flow. This method provides measurement of the actual error in the discretization, and can adjust spatial accuracy to minimize the error to some specified amount. The dynamic characteristics of the pressure and velocity fields of unsteady incompressible and compressible turbulent wakes behind a circular cylinder are investigated numerically and analyzed physically.

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