Simulation of supersonic axisymmetric base flow with a data-driven turbulence model

Heo, Seoyeon; Yun, Yeji; Jeong, Minjae; Jee, Solkeun

doi:10.1016/j.ast.2024.109014

Cited by 2 publications

(1 citation statement)

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“…But it always lacks sufficient accuracy in the prediction of unsteady flows which are usually accompanied by massively separated turbulence flows, largely due to its neglect of the strong nonequilibrium effect of turbulence in supersonic separated flows. Other recent advances in RANS models include data-driven models (Heo et al ., 2024) and APG/separation correction (Wang et al ., 2024), which both achieve significant improvements in prediction RANS performance by adjusting a net balance between the production and destruction terms in the RANS equation. Large eddy simulation (LES) (Das and De, 2015) has improved the accuracy in predicting the unsteady flow structures near the wake and sufficiently accurate results are obtained.…”

Section: Introductionmentioning

confidence: 99%

High-order discretization–based self-adaptive turbulence eddy simulation for supersonic base flow with PHengLEI software

Wu,

Yan,

Min

et al. 2024

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PurposeThe purpose of the present study is to develop a new numerical framework that can predict the supersonic base flow more accurately, including the development of axisymmetrically separated shear layer and recompression shock. To this end, two aspects are improved and combined, i.e. a newly self-adaptive turbulence eddy simulation (SATES) turbulence modeling method and a high-order discretization numerical scheme. Furthermore, the performance of the new numerical framework within a general-purpose PHengLEI software is assessed in detail.Design/methodology/approachSatisfactory prediction of the supersonic separated shear layer with unsteady wake flow is quite challenging. By using a unified turbulence model called SATES combining high-order accurate discretization numerical schemes, the present study first assesses the performance of newly developed SATES for supersonic axisymmetric separation flows. A high-order finite differencing-based compressible computational fluid dynamics (CFD) code called PHengLEI is developed and several different numerical schemes are used to investigate the effects on shock-turbulence interactions, which include the monotonic upstream-centered scheme for conservation laws (MUSCL), weighted compact nonlinear scheme (WCNS) and hybrid cell-edge and cell-node dissipative compact scheme (HDCS).FindingsCompared with the available experimental data and the numerical predictions, the results of SATES by using high-order accurate WCNS or HDCS schemes agree better with the experiments than the results by using the MUSCL scheme. The WCNS and HDCS can also significantly improve the prediction of flow physics in terms of the instability of the annular shear layer and the evolution of the turbulent wake.Research limitations/implicationsThe small deviations in the recirculation region can be found between the present numerical results and experimental data, which could be caused by the inaccurate incoming boundary layer condition and compressible effects. Therefore, a proper incoming boundary layer condition with turbulent fluctuations and compressibility effects need to be considered to further improve the accuracy of simulations.Practical implicationsThe present study evaluates a high-order discretization-based SATES turbulence model for supersonic separation flows, which is quite valuable for improving the calculation accuracy of aeronautics applications, especially in supersonic conditions.Originality/valueFor the first time, the newly developed SATES turbulence modeling method combining the high-order accurate WCNS or HDCS numerical schemes is implemented on the PHengLEI software and successfully applied for the simulations of supersonic separation flows, and satisfactory results are obtained. The unsteady evolutions of the supersonic annular shear layer are analyzed, and the hairpin vortex structures are found in the simulation.

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Section: Introductionmentioning

confidence: 99%

High-order discretization–based self-adaptive turbulence eddy simulation for supersonic base flow with PHengLEI software

Wu,

Yan,

Min

et al. 2024

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Ensuring the Abrasive Jet Machining Efficiency Using a Nozzle with a Perforated Insert

Baha,

Pavlenko,

Židek

et al. 2024

Machines

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Ejector-cleaning devices for abrasive jet machining have various practical applications. The working nozzle is one of the device’s key elements affecting the treated surface quality. There arises the necessity for new approaches to achieving an efficiency increase in abrasive jet equipment nozzles, namely their design improvement and further development of a new, relatively cheap but effective technology for their manufacturing and maintenance. This technology should allow for the high durability of nozzles without being essential for the hardness or wear resistance parameters of the material used for manufacturing. The nozzle should be designed as a long-length perforated insert to allow for radial airflow, forcing the abrasive material (river sand) from the inner walls of the nozzle’s working surface to reduce its friction with the abrasive material. This will result in new wear-out conditions, providing an essential decrease in the wear-out of a nozzle’s working surface. The article aims to develop a more effective design for the working nozzle based on the perforated insert application. The task was set to provide a more detailed experimental and theoretical study of the processes in perforated nozzles to improve their effectiveness. The research resulted in a new design for nozzles with higher efficiency.

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Simulation of supersonic axisymmetric base flow with a data-driven turbulence model

Cited by 2 publications

References 35 publications

High-order discretization–based self-adaptive turbulence eddy simulation for supersonic base flow with PHengLEI software

High-order discretization–based self-adaptive turbulence eddy simulation for supersonic base flow with PHengLEI software

Ensuring the Abrasive Jet Machining Efficiency Using a Nozzle with a Perforated Insert

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