Zonal Detached-Eddy Simulation Applied to the Tip-Clearance Flow in an Axial Compressor

Riéra, William; Marty, Julien; Castillon, Lionel; Deck, Sébastien

doi:10.2514/1.j054438

Cited by 35 publications

(33 citation statements)

References 54 publications

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“…The second grid (called "M2") is the same used for Zonal Detached Eddy Simulation by Riéra et al [10,11]. The normalized wall cell dimension ∆x + and ∆z + are detailed in [11]. Two passages are simulated in order to fit the spatial periodicity of the IGV.…”

Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

“…These two leakage flows and blade fillets are not included in the computational domain as the massflow are very small and the impact on tip leakage vortex is several order of magnitude smaller than the IGV wakes and vortices. In this configuration, the IGV effects are reproduced with specific inlet boundary conditions based on 2D cartography resulting from a previous IGV-R1 computation [11]. It consists in a rotating distortion cartography, whose method was used for centrifugal compressor by [22], based on a Fourier decomposition with 60 harmonics of the two-dimensional map of the flow.…”

Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

“…Using IDDES, Shi et al [9] investigate the tip flow interacting with shock wave resulting in a curved shock surface and shock oscillations. Zonal Detached Eddy Simulation was also performed by Riéra et al [10,11] to study the tip leakage vortex and its interaction with incoming wakes and vortices. You et al [12] and Boudet et al [13] performed Large Eddy Simulation (LES) of a clearance flow.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Scale Adaptive Simulation of a Rotor of High Pressure Compressor

Marty

Gaible

Bézard

2018

Volume 2C: Turbomachinery

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The main design objectives of a high pressure compressor are the aerodynamic efficiency and the operating range (e.g. the surge margin). Those quantities are impacted by secondary and leakage flows occurring in the blade passage such as corner separation or stall and tip leakage flows. The turbulence modeling influences strongly the prediction of the overall performances. The aims of the present study were (i) the validation of the combination of the SAS approach with the DRSM turbulence model by comparison to experimental data, especially to laser measurements in the tip of a rotor of a high pressure compressor and (ii) the discussion of the flow prediction improvements with respect to turbulence approaches classically used in CFD and industry: URANS simulations and standard SAS simulation i.e. combined with SST turbulence model. The SAS results are compared to experimental data and to URANS results (SST and DRSM). Only the simulations with IGV wakes predict the velocity fluctuations near tip gap, from the leading edge. Concerning the time-averaged performances, the stagnation pressure losses are slightly overestimated by SAS, especially with DRSM model. This is due to an amplification of the hub corner separation. Moreover, the isentropic efficiency is very sensitive to the SAS approach and to the turbulence model. The spectral analysis shows that the prediction of the amplitude and frequencies of the power spectral density of static pressure is improved using the SAS approach instead of URANS one. The SAS approach leads to PSD similar to ZDES, especially with the DRSM model. Thus, the SAS-DRSM is able to well predict the tip leakage flow with the fine mesh. Nevertheless, this approach amplifies the hub corner separation leading to a strong underestimation of overall performances.

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Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of Scale Adaptive Simulation of a Rotor of High Pressure Compressor

Marty

Gaible

Bézard

2018

Volume 2C: Turbomachinery

Self Cite

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“…Smith et al (2015)) it is the rising number of numerical investigations using higher order models such as large eddy simulations (e.g. Hah et al (2015), Riéra et al (2016)) that demonstrate the demand for an improved physical understanding of the TLV itself and the wake interaction process.…”

Section: Introductionmentioning

confidence: 99%

Challenges of creating realistic periodical unsteady inflow conditions in a linear compressor cascade

Krug

Busse

Lange

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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The paper presents results of an experimental investigation into the effects of a periodic wake induced inlet disturbance on the tip leakage flow in a linear compressor cascade. A translatory wake generator, being equipped with circular cylinders, is used to produce the unsteady inflow. The setup resembles the kinematic conditions found in the compressor rotor tip region. A variation of the flow coefficient ϕ is considered to account for effects arising from inappropriately oriented wake trajectories. The evaluation of the cascade flow field mainly relies on five-hole probe and two-dimensional CTA probe data. Differences in the resulting inlet conditions are discussed in the context of the steady and time-resolved leakage flow characteristics being strongly dependent on ϕ. The interaction between the moving bar wakes and the sidewall boundary layer is suggested to cause the absence of any periodic interaction for realistic values of ϕ in this configuration.

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“…Detached-eddy simulation (DES) takes advantage of the Reynolds-averaged Navier-Strokes (RANS) method where mean flow is attached and steady (e.g., walls), while offering, like large-eddy simulation (LES), the sensitivity to capture unsteady flow phenomena in areas of physical interest such as wakes or recirculation zones [1][2][3][4][5]. Although this strategy is beyond the computational cost of a steady RANS calculation, it reveals nearly as much information about the flow dynamics as LES.…”

Section: Introductionmentioning

confidence: 99%

An Entropy-Assisted Shielding Function in DDES Formulation for the SST Turbulence Model

Zhou

Zhao

Shi

2017

Entropy

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Abstract:The intent of shielding functions in delayed detached-eddy simulation methods (DDES) is to preserve the wall boundary layers as Reynolds-averaged Navier-Strokes (RANS) mode, avoiding possible modeled stress depletion (MSD) or even unphysical separation due to grid refinement. An entropy function f s is introduced to construct a DDES formulation for the k-ω shear stress transport (SST) model, whose performance is extensively examined on a range of attached and separated flows (flat-plate flow, circular cylinder flow, and supersonic cavity-ramp flow). Two more forms of shielding functions are also included for comparison: one that uses the blending function F 2 of SST, the other which adopts the recalibrated shielding function f d_cor of the DDES version based on the Spalart-Allmaras (SA) model. In general, all of the shielding functions do not impair the vortex in fully separated flows. However, for flows including attached boundary layer, both F 2 and the recalibrated f d_cor are found to be too conservative to resolve the unsteady flow content. On the other side, f s is proposed on the theory of energy dissipation and independent on from any particular turbulence model, showing the generic priority by properly balancing the need of reserving the RANS modeled regions for wall boundary layers and generating the unsteady turbulent structures in detached areas.

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Zonal Detached-Eddy Simulation Applied to the Tip-Clearance Flow in an Axial Compressor

Cited by 35 publications

References 54 publications

Assessment of Scale Adaptive Simulation of a Rotor of High Pressure Compressor

Assessment of Scale Adaptive Simulation of a Rotor of High Pressure Compressor

Challenges of creating realistic periodical unsteady inflow conditions in a linear compressor cascade

An Entropy-Assisted Shielding Function in DDES Formulation for the SST Turbulence Model

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