Engineering Applications of Large-scale Fluid-flow Computations#
Chisachi Kato (The Univ. of Tokyo)
Abstract#
Large eddy simulation (LES) directly computes production-scale eddies in turbulence and provides nearly the same accuracy as direct numerical simulation (DNS). It is therefore expected to replace various tests performed for the final evaluation of flow-related products, such as wind-tunnel tests in automotive engineering, towing-tank tests in ship hydrodynamics, and performance tests for turbomachinery. However, the application of LES to high Reynolds number flows typically requires very large computations of billions to trillions of grids. In order to implement LES in various engineering fields and completely replace testing, we have developed two application software (hereafter referred to as applications), FrontFlow/blue (FFB) and FrontFlow/X (FFX). The former is based on the Finite Element Method (FEM) while the latter is based on the Lattice Boltzmann Method (LBM). Both applications have been running on various latest platforms, including NEC's Aurora-TSUBASA. After a brief introduction to these applications, the latest results obtained with FFB and FFX will be presented and future prospects for HPC in this area will be discussed.