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 G29: Compressible Turbulence 
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Chair: Diego Donzis, Texas A&M University Room: Georgia World Congress Center B401 
Monday, November 19, 2018 10:35AM  10:48AM 
G29.00001: Energy spectrum in compressible turbulence John Panickacheril John, Diego A. Donzis, Katepalli Raju Sreenivasan The general scaling of spectra in compressible turbulence is not well understood, 
Monday, November 19, 2018 10:48AM  11:01AM 
G29.00002: The governing parameters in compressible turbulence Diego A. Donzis, John Panickacheril John Incompressible turbulence is commonly characterized by a single nondimensional parameter, the Reynolds number ($R_\lambda$). However, when compressible effects are present other parameters are needed to characterize the flow, in part, because of the coupling between hydrodynamics and thermodynamics, and the type of external forcing used to sustain 
Monday, November 19, 2018 11:01AM  11:14AM 
G29.00003: Compressible effects on statistics and smallscale structures in homogeneous shear turbulence Song Chen, Jianchun Wang, Hui Li, Minpin Wan, Shiyi Chen The compressible effects on statistics and smallscale structures of stationary homogeneous shear turbulence (HST) are studied by numerical simulations in a threedimensional rectangular domain. The results show that pseudosound modes dominate compressible velocity field at turbulent Mach number (M_{t}) less than 0.1, giving rise to a 4^{th} power law of M_{t} for normalized compressible kinetic energy and dissipation rate. As M_{t} grows to larger than 0.3, acoustic modes become dominate and a quadratic scaling of M_{t} is observed for spectra of compressible velocity and pressure. The strain rate eigenvalue ratio tends to be 1:0:0 at relative high M_{t}, implying the existence of sheetlike structures. Some interesting features about vortex stretching and enstrophy production in HST are also discussed. 
Monday, November 19, 2018 11:14AM  11:27AM 
G29.00004: Cascades of temperature and entropy fluctuations in threedimensional compressible turbulence Jianchun Wang, Minping Wan, Song Chen, Chenyue Xie, LianPing Wang, Shiyi Chen Cascades of temperature and entropy fluctuations are studied by numerical simulations of stationary threedimensional compressible turbulence. The 5/3 scaling behavior is identified for the fluctuation spectra of temperature and entropy, with the ObukhovCorrsin constants close to that of a passive scalar spectrum. The average subgridscale (SGS) fluxes of temperature and entropy normalized by the total dissipation rates are close to 1 in the inertial range. The average SGS fluxes conditioned on the filtered velocity divergence exhibit the scaleinvariant property in the inertial range. Moreover, strong compression motions enhance the direct SGS fluxes of temperature and entropy from large scales to small scales. 
Monday, November 19, 2018 11:27AM  11:40AM 
G29.00005: Experimental Characterization of Inertial Range Statistics in Compressible Turbulence Naoki ManzanoMiura, Dasha Gloutak, Winnie Chan, Gregory P Bewley Compressible turbulence has applications to astrophysical fluid dynamics, highspeed civil transport, and combustion. For compressible subsonic flows, large turbulent fluctuations can generate randomly distributed regions of local vigorous fluid compression. Measurements are necessary to further develop physical models that quantify the influence of compressibility on turbulent flows. In our experiments, we fabricated nanoscale hot wire probes inspired by Vallikivi et al. (J. Microelectromech. Syst., 2014) using semiconductor manufacturing techniques, and measured turbulence in a specialized pressure vessel filled with sulfur hexafluoride gas. With the use of smaller than conventional hotwire probes, we resolve inertial range statistics. The dense gas sulfur hexafluoride makes it possible to reach high Mach numbers due to its lower speed of sound compared to air, and high Reynolds numbers since we can lower its kinematic viscosity by an order of magnitude with pressure adjustments. We report measurements of turbulence statistics as well as power spectra for turbulent Mach numbers up to 0.3, and for Taylor microscale Reynolds numbers between 200 and 3700. 
Monday, November 19, 2018 11:40AM  11:53AM 
G29.00006: Timeevolution of passive scalar structures in shockturbulence interaction Jonas Buchmeier, Xiangyu Gao, Ivan BermejoMoreno, Johan Larsson, Sanjiva K Lele, Lin Fu A tracking algorithm is introduced to study the time evolution of isosurfaces of any scalar quantity in turbulent flows by relating the geometry of the surface with the underlying flow physics. At every instant in time each educed isosurface is represented as a point in a feature space of parameters that characterize the structures, including geometric and physical information. Correspondences between all structures educed in consecutive time instants are used to construct a graph in which each vertex represents an individual structure at a given time and the edges indicate the found correspondences between the structures over time. 
Monday, November 19, 2018 11:53AM  12:06PM 
G29.00007: Numerical Investigation of Hypersonic Turbulence Transition Delay via Porous Walls Carlo Scalo, Victor Sousa, Viola Wartemann, Alexander Wagner The present abstract outlines the progress made towards conducting a numerical analysis using direct numerical simulation (DNS) of transition to turbulence in a hypersonic boundary layer over a cone which include the effects of acoustic energy absorption by a porous insert at the conical surface. A previous experimental study by Wagner et al. Exp. Fluids (2013) showed the capability of carbon/carbon (C/C) ultrasonically absorptive porous surfaces of performing a hypersonic boundary layer transition delay. The current numerical study uses the same flow conditions to compare the transition control obtained via the modelling the carbon/carbon (C/C) acoustic response as a complex impedance boundary condition (IBC) to the experimental results. To accurately model a fully anisotropic material such as C/C a new acoustic model was developed based on experimental results of pore size distribution.

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