Joint Experimental and Numerical Study of Gap-Turbulence Interaction

The paper presents the results of numerical simulations of gap – turbulence interaction which can be considered as a generic test case on airframe noise. In order to be able to assess the predictive capabilities of different numerical tools to accurately describe the noise generation mechanisms in the gap, a corresponding physical experiment is conducted. DDES and IDDES hybrid models implemented by higher accuracy numerical algorithms both for multi-block structured and tetrahedral unstructured meshes are used for the simulations. The paper presents the obtained numerical data including mean flow fields, turbulent boundary layer structure and far field acoustic spectra. Based on the comparison of experimental and numerical results, the study reveals physical features of the phenomenon.