Bulletin of the American Physical Society
77th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 24–26, 2024; Salt Lake City, Utah
Session ZC39: Turbulence: Compressible Flows |
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Chair: Diego Donzis, Texas A&M University College Station Room: 355 E |
Tuesday, November 26, 2024 12:50PM - 1:03PM |
ZC39.00001: A Particle Representation Model for Compressible Homogeneous Turbulence Noah Zambrano, Karthik Duraisamy This work introduces a new stochastic particle representation model (PRM) with transport equations derived in analogy to the rapid distortion theory for compressible homogeneous turbulence. By leveraging the equation of state and conservation of entropy, this model uses 5 fewer transport variables compared to past models for homogeneous compressible turbulence (Yu and Girimaji, Physics of Fluids, 2007) by relating the fluctuating pressure to the dilatational component of the velocity fluctuation. The compressible PRM is an exact representation of compressible turbulence at high distortion that only requires approximation in evaluating the integrals through numerical methods. Different methods for approximating the integrals with respect to the wavevector, such as Monte Carlo integration or quadrature, are examined. Results are compared to rapid distortion theory/DNS calculations and past compressible particle representation modeling attempts for axial compression, sheared compression, and pure shear cases. Furthermore, extension to inhomogenous turbulence is briefly discussed. |
Tuesday, November 26, 2024 1:03PM - 1:16PM |
ZC39.00002: Transition to Turbulence in ICF Capsule Implosions Fernando F Grinstein, Vincent P Chiravalle, Brian Michael Haines, Robert Greene, Filipe Pereira We simulate an indirect-drive NIF cryogenic capsule experiment, N170601, requiring multigroup radiation diffusion to transport x-ray energy from the cylindrical Hohlraum to the target capsule. The 3D simulation model involves miscible material interfaces and 3T plasma physics treatments. We use relatively coarse 2D runs through onset of turbulence, followed |
Tuesday, November 26, 2024 1:16PM - 1:29PM |
ZC39.00003: Variation of density gradient statistics with Mach number in compressible turbulence Hazel Thais Rivera-Rosario, John Panickacheril John, Diego A. Donzis, Gregory P Bewley The study of compressible behaviors in turbulence is used in various areas such as astrophysical flows, detonations, and scramjet engine combustion. The interactions of the eddies generate large velocity, pressure, and temperature gradients, and ultimately density gradients in the flow. Simulations show that the variance of density fluctuations in compressible turbulence is proportional to the Mach number to the 4th power. We explored density variations experimentally using a fan-generated jet in a pressurized vessel. The speed of sound in the vessel can be adjusted using different gases including sulfur-hexafluoride (SF6) to increase the turbulent Mach number up to 0.15 while holding the Taylor-Reynolds number constant at values up to 1000. To measure density gradients, we used quantitative schlieren imaging with a high-speed camera. In addition to the visualization of the turbulence in our facility, we analyzed the data temporally to calculate density gradients statistics. We observed an increase in the density gradient variance with Mach number akin to simulated results. |
Tuesday, November 26, 2024 1:29PM - 1:42PM |
ZC39.00004: Effect of compressibility and heat transfer on separated turbulent boundary layers Benjamin Dalman, Ivan Bermejo-Moreno Wall-resolved large-eddy simulations (WRLES) of the compressible Navier-Stokes equations are conducted of turbulent boundary layers subjected to adverse and then favorable pressure gradients over a flat plate, to explore the impact of compressibility and heat transfer on the dynamics of separated flows. Freestream Mach numbers ranging from 0.2 to 0.9, as well as adiabatic and cool wall boundary conditions are considered, with varying Reynolds numbers. Separation and reattachment is induced via a suction and blowing top boundary condition. A synthetic turbulent inlet is used. Mean velocity, pressure, and temperature contours around the separation bubble are compared. The effects of compressibility on mean velocity profiles are isolated by comparing different transformations. Profiles of Reynolds stresses and thermodynamic fluctuations around the bubble are also explored. Streamwise distributions of skin friction and pressure coefficients, and their fluctuations are examined for each case. The unsteadiness of the separation bubble is evaluated through spectral and modal analyses. |
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