Analysis of Compressibility Effects and Nonlinear Property Variations in a Supercritical CO2 Mixing Layer

Purushotham, Dhruv; Schau, Kyle A.; Oefelein, Joseph C.

doi:10.2514/6.2022-1738

Analysis of Compressibility Effects and Nonlinear Property Variations in a Supercritical CO2 Mixing Layer

Conference · 29 December 2022 · AIAA SCITECH 2022 Forum

DOI:https://doi.org/10.2514/6.2022-1738· OSTI ID:1844418

Purushotham, Dhruv ^[1]; Schau, Kyle A. ^[2]; Oefelein, Joseph C. ^[2]

Georgia Institute of Technology; Georgia Institute of Technology
Georgia Institute of Technology

Calculations are performed using the large eddy simulation technique to qualitatively assess the effects of fluid compressibility and thermodynamic nonlinearities on the dynamics of a supercritical flow field. Resulting data are also used to interrogate instantaneous subfilter-scale fields, as modeled by the mixed-dynamic Smagorinsky closure and gradient diffusion model. A three-dimensional wall-resolved calculation of a spatially evolving mixing layer composed solely of carbon dioxide is performed. This is followed by a coarse grid calculation to examine model performance as a function of resolution. Theoretical analysis indicates that the partial derivatives of density with respect to pressure and temperature are important modulators of the temperature and pressure field evolution, respectively. Results pertaining to subfilter velocity-velocity and velocity-temperature fields indicate that the models are most stressed in the regions where compressibility and thermo-fluid nonlinearities dominate the physics.

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Research Organization:: Georgia Institute of Technology

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

DOE Contract Number:: FE0031772

OSTI ID:: 1844418

Conference Information:: Journal Name: AIAA SCITECH 2022 Forum

Country of Publication:: United States

Language:: English

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