Scale-Resolving Simulations of Wall-Bounded Flows with an Unstructured Compressible Flow Solver

Probst, Axel; Reuß, Silvia

doi:10.1007/978-3-319-15141-0_39

Cited by 20 publications

(4 citation statements)

References 7 publications

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“…Due to the low dissipative nature of the numerical scheme, a fourth-order artificial matrix dissipation term is added for improved stability [14] which was optimized in LES of channel flows [15]. The artificial dissipation is preconditioned to obtain optimally tuned accuracy also in low Mach number regions [23].…”

Section: Methodsmentioning

confidence: 99%

Sensitivity of scale resolving aft-body flow simulations to numerical model parameter variations

Schumann

Hannemann

2021

CEAS Space J

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The sensitivity of hybrid RANS-LES methods like Improved Delayed Detached Eddy Simulation (IDDES) to numerical model parameter variations related to generic space launch vehicle aft-body flows is investigated. In particular, the changes resulting from the choice of the time-step size, the turbulence model, the fluid modelling, the circumferential grid resolution, the filter length definition, and the data collection period is considered. The results are also compared to experimental and numerical data taken from the available literature. The sensitivity to the time-step size and the turbulence model is minuscule with respect to the obtained mean flow field, wall pressure distributions, azimuthal modes, and wall pressure frequency spectra. However, circumferential resolution, fluid model, and filter length definition affect the solution to a higher extent. Buffeting spectra are very sensitive to the data collection period.

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Section: Methodsmentioning

confidence: 99%

Sensitivity of scale resolving aft-body flow simulations to numerical model parameter variations

Schumann

Hannemann

2021

CEAS Space J

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“…More recent approaches (cf. [22], [23], [24]) improved this length scale and also incorporate flow physics, such as the vorticity vector.…”

Section: Ddes Modelmentioning

confidence: 99%

Transitional Delayed Detached-Eddy Simulation for a Compressor Cascade: A Critical Assessment

Möller,

Tucker,

Wang

et al. 2024

Journal of Propulsion and Power

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The accurate prediction of transitional flows is crucial for the industrial turbomachinery design process. While a Reynolds-averaged Navier–Stokes approach inherently brings conceptual weaknesses, large-eddy simulation will still be too expensive in the near future to affordably analyze complex turbomachinery configurations. We introduce a transitional delayed detached-eddy simulation (DDES) model, namely, DDES-[Formula: see text], and analyze the numerical results of the compressor cascade V103. A comparison with the fully turbulent DDES approach emphasizes the benefit of coupling DDES with a transition model. Issues with undesired decay of modeled turbulent kinetic energy in the freestream are improved when running DDES-[Formula: see text] in combination with the synthetic turbulence generator method. The best results for DDES-[Formula: see text] are obtained when changing the inviscid flux solver blending from dynamic to constant mode. We show that DDES-[Formula: see text] is capable of predicting the transitional flow through a linear compressor cascade, but we also critically discuss the general concept and results.

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“…New approaches (cf. [21], [22], [23]) improved this length scale and nowadays also incorporate flow physics, such as the vorticity vector. The simulations in the present paper are based on the extended, vorticity-based Δ SLA (= shear layer adaptive) by Shur et al [24].…”

Section: Ddes Modelmentioning

confidence: 99%

Critical Assessment of a Transitional Delayed Detached-Eddy Simulation Model for the Prediction of the Linear Compressor Cascade V103

Möller

Tucker

Wang

et al. 2023

AIAA AVIATION 2023 Forum

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The accurate prediction of transitional flows is crucial for the industrial turbomachinery design process. While RANS inherently brings conceptual weaknesses, LES will be still too expensive in the near future to affordably simulate complex turbomachinery configurations. We introduce a transitional DDES model, namely DDES-𝛾, and analyze numerical results of the compressor cascade V103. A comparison with the fully turbulent DDES approach emphasizes the benefit of coupling DDES with a transition model. Issues with undesired decay of modelled turbulent kinetic energy in the free-stream are improved when running DDES-𝛾 in combination with the synthetic turbulence generator method. Best results for DDES-𝛾 are obtained when changing the inviscid flux solver blending from dynamic to constant mode. We show that DDES-𝛾 is capable to predict the transitional flow through a linear compressor cascade, but also critically discuss the general concept and results.

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Scale-Resolving Simulations of Wall-Bounded Flows with an Unstructured Compressible Flow Solver

Cited by 20 publications

References 7 publications

Sensitivity of scale resolving aft-body flow simulations to numerical model parameter variations

Sensitivity of scale resolving aft-body flow simulations to numerical model parameter variations

Transitional Delayed Detached-Eddy Simulation for a Compressor Cascade: A Critical Assessment

Critical Assessment of a Transitional Delayed Detached-Eddy Simulation Model for the Prediction of the Linear Compressor Cascade V103

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