Turbulence statistics of supersonic rectangular jets using Reynolds Stress Model in RANS and WALE LES

Bhide, Kalyani; Abdallah, S.

doi:10.2514/6.2022-3344

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…Therefore, this paper aims to bridge the gap. In our previous work, non-linear eddy viscosity and Reynolds stress model-based investigation was conducted to capture the anisotropy of turbulence [26,27]. TKE production term was evaluated using WALE subgrid-scale LES and non-linear eddy viscosity-based two-equation RANS model.…”

Section: Budget Analysis Of Incompressible and Compressible Flow In O...mentioning

confidence: 99%

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

Bhide¹,

Abdallah²

2022

Aerospace

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Turbulence is governed by various mechanisms, such as production, dissipation, diffusion, dilatation and convection, which lead to its evolution and decay. In high-speed flows, turbulence becomes complicated due to compressibility effects. Therefore, the goal of the current work is to characterize these mechanisms in rectangular supersonic jets by directly evaluating their contributions in turbulent kinetic energy (TKE) budget equation. The budgets are obtained using high-fidelity Large Eddy Simulations that employ WALE subgrid-scale model. Jet nearfield data are validated with PIV experimental measurements, available from the literature, which include mean flow and second-order statistics. To ensure spatial resolution and temporal convergence of higher-order statistics, qualitative performance metrics are presented. The results indicate that TKE production is the major source term, while pressure-dilatation term acts as a sink throughout the development of the jet. The diffusion term has the highest contribution from triple-velocity correlations, followed by pressure diffusion and molecular diffusion. Subgrid-scale diffusion and dissipation are also evaluated and their contributions are minimal. Each term is presented on both minor and major axis plane and reveals asymmetry in the statistics. A detailed explanation of budget contributions is provided, leading to the mechanisms responsible for the anisotropy of TKE.

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Section: Budget Analysis Of Incompressible and Compressible Flow In O...mentioning

confidence: 99%

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

Bhide¹,

Abdallah²

2022

Aerospace

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“…Boychev [49] demonstrated the effect of non-linear RANS in shock wave boundary layer interactions. Authors' previous work [50,51] has addressed non-linear and Reynolds stress transport-based RANS for supersonic jet.…”

Section: Introductionmentioning

confidence: 99%

High-Order Accurate Numerical Simulation of Supersonic Flow Using RANS and LES Guided by Turbulence Anisotropy

Bhide

Abdallah

2022

Fluids

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This paper discusses accuracy improvements to Reynolds-Averaged Navier–Stokes (RANS) modeling of supersonic flow by assessing a wide range of factors for physics capture. Numerical simulations reveal complex flow behavior resulting from shock and expansion waves and so, a supersonic jet emanating from rectangular nozzle is considered. PIV based experimental data for the jet is available from literature and is used for validation purposes. Effect of various boundary conditions and turbulence modeling approaches is assessed qualitatively and quantitatively. Of particular interest are the inlet conditions considering the turbulence intensity and the effect of upstream air supply duct, the effect of nozzle wall surface roughness on nozzle internal flow and downstream, wall y+ sensitivity for boundary layer resolution and laminar to turbulent transition modeling. In addition to mesh sensitivity, domain dependency is conducted to evaluate the appropriate domain size to capture the kinetic energy dissipation downstream of the nozzle. To further improve the flow characteristics, accounting for the anisotropy of Reynolds stresses is also one of the focuses. Therefore, non-linear eddy viscosity-based two-equation model and Reynolds stress transport model are also investigated. Additionally, the results of baseline linear (Boussinesq) RANS are compared. Corresponding comparisons with high-fidelity LES are presented. Jet self-similar behavior resulting from all simulation fidelities is assessed and it appears that turbulent flow in LES becomes self-similar, but not in RANS. Finally, various factors such as the nozzle geometry and numerical modeling choices influencing the anisotropy in jet turbulence are discussed.

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A close look at Reynolds stress tensor prediction for turbulence capture in supersonic flow

Bhide

Abdallah

2023

AIAA SCITECH 2023 Forum

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Turbulence statistics of supersonic rectangular jets using Reynolds Stress Model in RANS and WALE LES

Cited by 5 publications

References 10 publications

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

High-Order Accurate Numerical Simulation of Supersonic Flow Using RANS and LES Guided by Turbulence Anisotropy

A close look at Reynolds stress tensor prediction for turbulence capture in supersonic flow

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