Scientific Visualization, 2018, volume 10, number 2, pages 112 - 121, DOI: 10.26583/sv.10.2.09
Application of high-speed thermographic visualization for validation of numerical simulations of liquid boundary layer flows
Author: E.Yu. Koroteeva
Lomonosov Moscow State University, Moscow, Russia
ORCID: 0000-0002-1705-5142, koroteeva@physics.msu.ru
Abstract
Jet flows and boundary layers are a common benchmark in computational fluid dynamics. Today, the data obtained by quantitative and qualitative numerical flow visualization form the basis for calibration and validation of different semi-empirical turbulence models. This work analyses the capabilities of high-speed infrared (IR) thermography for estimating the turbulent properties of liquid boundary layers. The ability of most liquids to effectively absorb IR radiation of a certain wavelength on a submillimeter scale allows the registration of time-varying heat fluxes from a thin boundary layer, by thermal imaging through IR-transparent vessel walls. The technique is tested on two model jet boundary flows, and the thermal spectra are analyzed in the frequency range of 1-150 Hz at different points within the boundary layer. Based on the comparison between the experimental results and the 3D CFD simulation data, it is shown that the regions of the boundary layer with certain spectral properties may be associated with the specific flow structures. It provides a wide perspective for high-speed thermography to enlarge the experimental database needed for validation and testing of numerical models of turbulent boundary liquid flows.
Keywords: infrared thermography, spectral analysis, jet flows, boundary layer flows, CFD simulation, validation.
