Extra-Large Eddy Simulation of Massively Separated Flows

Kok, J.C.; Dol, H.S.; Oskam, B.; Ven, H. van der

doi:10.2514/6.2004-264

Cited by 71 publications

(44 citation statements)

References 19 publications

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“…The hybrid RANS/LES method according to Davidson and Peng (2003) [8] and Kok et al (2004) [9] is used in this work. This approach uses one transport equation for the kinetic energy which plays role of the turbulent kinetic energy in RANS mode and the subgrid scale kinetic energy in LES mode.…”

Section: Closure Formulamentioning

confidence: 99%

“…The hybrid RANS/LES method according to Davidson and Peng (2003) [8] and Kok et al (2004) [9] switches between the system of RANS equations closed by two-equation turbulence model of Kok (2000) [3] and LES when computational mesh is fine enough to simulation of large turbulent eddies. The sub-grid scale model of LES is based on transport equation for the sub-grid scale turbulent energy given by eq.…”

Section: Xles Modelmentioning

confidence: 99%

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Modelling of Unsteady Secondary Vortices Generated Behind the Radial Gap of the Axial Turbine Blade Wheel

Straka¹

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. The paper deals with application of the linear eddy viscosity model, the nonlinear explicit algebraic Reynolds stress model and the hybrid RANS/LES model for computation of flow in an axial turbine stage with radial gaps under the stator and above the rotor blade. Results show that the nonlinear explicit algebraic Reynolds stress model allows to describe deformation of the secondary vortices and their breakdown into smaller structures while the linear eddy viscosity model doesn't have this capability. Only hybrid RANS/LES model describes decay of the secondary vortices which interact with the rotor blade. This capability is necessary for good prediction of distribution of the turbine stage efficiency behind the rotor blade. 7532Straka P.

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Section: Closure Formulamentioning

confidence: 99%

Section: Xles Modelmentioning

confidence: 99%

Modelling of Unsteady Secondary Vortices Generated Behind the Radial Gap of the Axial Turbine Blade Wheel

Straka¹

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…The constant C DES has been taken from Kok et al (2004), namely, C DES =0.67. The local grid size Δ is defined by Δ=max (Δ x , Δ y, Δ z ) where Δ x , Δ y, Δ z denote the distances between the cell faces in x, y and z directions.…”

mentioning

confidence: 99%

“…The second model is the model of Kok et al (2004), where the underlying k-ω model has been used for construction of the "X-LES" approach. In Kok et al (2004), the turbulent length scale is replaced by the grid size in both…”

mentioning

confidence: 99%

Progress in Hybrid RANS-LES Modelling

Girimaji¹,

Haase²,

Peng³

et al. 2010

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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To refer to or to cite this work, please use the citation to the published version: Kubacki S., Dick E. (2010). Hybrid RANS/LES of plane impinging jets with k-ω based models. Progress in hybrid RANS-LES AbstractPlane impinging jets with nozzle-plate distances H/B=10 at Re=13500 and H/B=9.2 at Re=20000 are simulated with k-ω  based hybrid RANS/LES models. Three ways of substitution of the turbulent length scale by the local grid size in the LES mode of the hybrid RANS/LES models are tested. The results show that the hybrid models give much better prediction of wall shear stress and heat transfer rate along the impingement plate than the RANS model. The good performance of the hybrid models is due to their ability to resolve the evolution and break-up of the vortices in the shear layer of the jet, which strongly affects the turbulent flow and convective heat transfer in the stagnation region and the developing wall-jet region.

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“…Several rotation corrections for vortex dominated flows are available for the different models. Finally, there are options to perform detached eddy simulations (DES) based on the Spalart-Allmaras model [48] and so-called Extra-Large Eddy Simulations (XLES) [24].…”

Section: Figmentioning

confidence: 99%

Mathematical Modelling of Flow through Pleated Cartridge Filters

Nassehi

Waghode

Hanspal

et al. 2006

Progress in Industrial Mathematics at ECMI 2004

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Summary. Some years ago the national CFD project MEGAFLOW was initiated in Germany, which combined many of the CFD development activities from DLR, universities and aircraft industry. Its goal was the development and validation of a dependable and efficient numerical tool for the aerodynamic simulation of complete aircraft which met the requirements of industrial implementations. The MEGAFLOW software system includes the block-structured Navier-Stokes code FLOWer and the unstructured Navier-Stokes code TAU. Both codes have reached a high level of maturity and they are intensively used by DLR and the German aerospace industry in the design process of new aircraft. Recently, the follow-on project MEGADESIGN was set up which focuses on the development and enhancement of efficient numerical methods for shape design and optimization. This paper highlights recent improvements and enhancements of the software. Its capability to predict viscous flows around complex industrial applications for transport aircraft design is demonstrated. First results concerning shape optimization are presented.

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Extra-Large Eddy Simulation of Massively Separated Flows

Cited by 71 publications

References 19 publications

Modelling of Unsteady Secondary Vortices Generated Behind the Radial Gap of the Axial Turbine Blade Wheel

Modelling of Unsteady Secondary Vortices Generated Behind the Radial Gap of the Axial Turbine Blade Wheel

Progress in Hybrid RANS-LES Modelling

Mathematical Modelling of Flow through Pleated Cartridge Filters

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