Detailed Numerical Analysis of the S3Ch Transonic Empty Test Section

Abstract

In order to be able to reach a numerical digital twin for a wind tunnel, precise validation must be achieved. Due to the complexity of the wind tunnels (corners with vanes, engine, honey combs and filters. . . ) and the numeric complexity (meshes, turbulence models, spatial schemes, implementation. . . ) the validation of the full circuit as a whole is challenging. Thus, in this paper, we focus on the validation of the high speed leg of the S3Ch tunnel (ONERA S3Ch return circuit wind tunnel located in Meudon). The paper features several RANS simulations from various partners with comparisons to experimental data. The empty test section is investigated at transonic speed (M = 0.700). Most of the detailed comparisons are carried out while operating the tunnel fully subsonic. Some insights are given on the operation of the tunnel with the second sonic throat active. This mode is challenging for the numerical simulations.