GATT is a research group on flow instabilities with applications to aeroacustics, transition to turbulence and shear flow turbulence. It aims at combining detailed physical experiments, high fidelity numerical simulations and hydrodynamic instability theory or other analytical tools to unveil the flow physics of compelx flows.
The current and previous applications of interest to the group include slat, jet and open cavity noise. They also include natural transition in boundary layers, as well as transition induced by gaps, steps and other surface imperfections. Other flows, such as mixing layer and wakes have also been investigated by the group in the same context.
The group traces its origin to sometime in the first decade of the century. Important milestone dates include, 2010, when its building housing the group was completed; 2015, when its first supercomputer was acquired; and 2017, when its low acoustic noise and low turbulence wind tunnel was inaugurated.
The group develops its own codes, such as codes for direct numerical simulation, for local and global instability analysis, for the signal processing of data from microphone arrays of the beamforming type. These codes are available for public.
Support to the group activities come from both the state sector, such as FAPESP, FINEP, CNPq and CAPES, as well as from the private sector, mostly Embraer. It also includes international institutions, such as AFOSR/USA, The Boeing Company, the European Union and the SEB Groupe.
This demonstrates the group activity ranges from very fundamental to applied sciences.
The physical infra-structure available to the group includes supercomputers (in-loco and for remote access) and a wind tunnel instrumented with hot-wire anemometry, PIV, a hundred plus microphones with corresponding data acquisition systems, and a 3D traverse system dedicated to probe positioning in the wind tunnel working section.
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