Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F25: Instability: Boundary Layers
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B313
Chair: Jovan Nedic, McGill University
Abstract ID: BAPS.2018.DFD.F25.8
Abstract: F25.00008 : Receptivity of high-speed boundary layers in binary mixture of gases to kinetic fluctuations*
9:31 AM–9:44 AM
Presenter:
Kevin Luna
(Univ of Arizona)
Authors:
Anatoli Tumin
(Univ of Arizona)
Kevin Luna
(Univ of Arizona)
The receptivity of high-speed boundary layers in Binary Mixture of gases (oxygen and nitrogen) to kinetic fluctuations (KF) is considered within the framework of fluctuating hydrodynamics. The formulation is based on the idea that KF-induced dissipative fluxes may lead to the generation of unstable modes in the boundary layer. The binary mixtures may serve as limiting cases for real gas effects in an airflow. It is assumed that KF manifest themselves in this context through “stochastic forcing” by a random stress tensor, a random heat flux, a random species diffusion, and a random chemical source term. The approach taken here follows that of Fedorov and Tumin (2017), but includes previously unconsidered effects such as fluctuating species diffusion and fluctuating species production. The results are in agreement with Fedorov and Tumin (2017) where it was shown that in the case of a calorically perfect gas, that boundary layer flow is most susceptible to kinetic fluctuations in the critical layer and that the fluctuations of the shear stress in the streamwise momentum equation are the dominant fluctuations.
*This work was supported by AFOSR Grant FA9550-15-1-0369
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F25.8
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