Grid Convergence for Three Dimensional Benchmark Turbulent Flows

Abstract

Grid convergence studies are performed to establish reference solutions for benchmark three dimensional turbulent flows in support of the ongoing turbulence model verification and validation effort at the Turbulence Modeling Resource website curated by NASA. The benchmark cases are a subsonic flow around a hemisphere cylinder and a transonic flow around the ONERA M6 wing with a sharp trailing edge. The study applies widely-used computational fluid dynamics codes developed and supported at the NASA Langley Research Center: FUN3D, USM3D, and CFL3D. Reference steady-state solutions are computed for the Reynolds-Averaged Navier-Stokes equations with the Spalart-Allmaras turbulence model on families of consistently-refined grids composed of different types of cells. Coarse-to-fine and code-to-code solution variation is described in detail.

Numerical investigation of the effects of fuselage upsweep in a propulsive fuselage concept

“…Strategic and 96% wing span. Experimental data from [39], CFL3D, FUN3D, and USM3D data from [38] alteration of the outer FF nacelle surface geometry can, however, efficiently alleviate the effect.…”

“…For the validation, the mesh provided by the CFL3D Test/ Validation archive is used [36]. Freestream conditions corresponding to case 2308 of the Onera S2MA wind tunnel test are provided by NASA Langley Research Center Turbulence Model Numerical Analysis [37] and documented in [38] (see Table 2). Experimental results for the pressure distribution are documented for the original wind tunnel tests in [39].…”

“…Experimental results for the pressure distribution are documented for the original wind tunnel tests in [39]. The skin friction distribution is compared against numerical results computed with the CFD codes FUN3D and CFL3D developed at NASA Langley Research Center [38].…”

Customized Grid Generation Codes for Benchmark Three-Dimensional Flows

“…Statistics of grids from families 2 (tet), 4 (prism/hex), and 5 (struct) are shown in Table 3. Theses grids are used to compute the reference solutions in the accompanying paper [15].…”

“…The codes generate families of high-quality consistently refined grids with different elements. These grids are used to establish reference solutions through a grid convergence study reported in an accompanying paper [15].…”