scholarly journals Extension of a Non-Oscillatory Forward-in-Time Scheme to Detached Eddy Simulation of Stratified Turbulent Flows With Unstructured Meshes

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 170282-170291 ◽  
Author(s):  
Zhao Zhang ◽  
Tao Zhang
Keyword(s):  
Turbulent Flows ◽  
Unstructured Meshes ◽  
Detached Eddy Simulation ◽  
Eddy Simulation

Comparison of Convective Flux Discretization Schemes in Detached-Eddy Simulation of Turbulent Flows on Unstructured Meshes

2015 ◽  
Vol 67 (1) ◽  
pp. 176-191 ◽  
Author(s):  
Andrey Kozelkov ◽  
Vadim Kurulin ◽  
Vladislav Emelyanov ◽  
Elena Tyatyushkina ◽  
Konstantin Volkov
Keyword(s):  
Turbulent Flows ◽  
Unstructured Meshes ◽  
Detached Eddy Simulation ◽  
Convective Flux ◽  
Eddy Simulation ◽  
Discretization Schemes

scholarly journals High-fidelity simulations of unsteady civil aircraft aerodynamics: stakes and perspectives. Application of zonal detached eddy simulation

2014 ◽  
Vol 372 (2022) ◽  
pp. 20130325 ◽  
Author(s):  
Sébastien Deck ◽  
Fabien Gand ◽  
Vincent Brunet ◽  
Saloua Ben Khelil
Keyword(s):  
Turbulent Flows ◽  
Hybrid Methods ◽  
Landing Gear ◽  
High Fidelity ◽  
Detached Eddy Simulation ◽  
High Lift ◽  
Eddy Simulation ◽  
Civil Aircraft ◽  
Aircraft Aerodynamics ◽  
Transonic Buffet

This paper provides an up-to-date survey of the use of zonal detached eddy simulations (ZDES) for unsteady civil aircraft applications as a reflection on the stakes and perspectives of the use of hybrid methods in the framework of industrial aerodynamics. The issue of zonal or non-zonal treatment of turbulent flows for engineering applications is discussed. The ZDES method used in this article and based on a fluid problem-dependent zonalization is briefly presented. Some recent landmark achievements for conditions all over the flight envelope are presented, including low-speed (aeroacoustics of high-lift devices and landing gear), cruising (engine–airframe interactions), propulsive jets and off-design (transonic buffet and dive manoeuvres) applications. The implications of such results and remaining challenges in a more global framework are further discussed.

DES, Hybrid RANS/LES and PANS Models for Unsteady Separated Turbulent Flow Simulations

2005 ◽  
Author(s):  
D. Basu ◽  
A. Hamed ◽  
K. Das
Keyword(s):  
Turbulent Flows ◽  
Subsonic Flow ◽  
Skin Friction Coefficient ◽  
Comparative Assessment ◽  
Navier Stokes ◽  
Detached Eddy Simulation ◽  
Flow Simulations ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Scale Structures

This paper presents computational results for two DES (Detached Eddy Simulation), one hybrid RANS (Reynolds Averaged Navier-Stokes)/ LES (Large Eddy Simulation) and some preliminary results from PANS (Partially Averaged Navier-Stokes) turbulence for simulation of unsteady separated turbulent flows. The models are implemented in a full 3-D Navier Stokes solver and are based on the two-equation k-ε model. The formulations of each model are presented and results are analyzed for subsonic flow over a Backward Facing Step (BFS). Simulations are carried out using a 3rd order Roe scheme. A comparative assessment is made between the predictions from the DES, hybrid and PANS models. The predicted results are compared with the available experimental data for skin-friction coefficient, and different turbulent quantities. The three-dimensionality of the flow field and the separated fine scale structures are presented through the Q iso-surfaces.

Wavelet-based adaptive delayed detached eddy simulations for wall-bounded compressible turbulent flows

2019 ◽  
Vol 873 ◽  
pp. 1116-1157 ◽  
Author(s):  
Xuan Ge ◽  
Oleg V. Vasilyev ◽  
M. Yousuff Hussaini
Keyword(s):  
Turbulent Flows ◽  
Channel Flow ◽  
Adaptive Mesh Refinement ◽  
Degrees Of Freedom ◽  
Mesh Refinement ◽  
Plane Channel ◽  
Adaptive Mesh ◽  
Adaptation Strategy ◽  
Detached Eddy Simulation ◽  
Eddy Simulation

A novel wavelet-based adaptive delayed detached eddy simulation (W-DDES) approach for simulations of wall-bounded compressible turbulent flows is proposed. The new approach utilizes anisotropic wavelet-based mesh refinement and its effectiveness is demonstrated for flow simulations using the Spalart–Allmaras DDES model. A variable wavelet thresholding strategy blending two distinct thresholds for the Reynolds-averaged Navier–Stokes (RANS) and large-eddy simulation (LES) regimes is used. A novel mesh adaptation on mean and fluctuating quantities with different wavelet threshold levels is proposed. The new strategy is more accurate and efficient compared to the adaptation on instantaneous quantities using a priori defined uniform thresholds. The effectiveness of the W-DDES method is demonstrated by comparing the results of the W-DDES simulations with results already available in the literature. Supersonic plane channel flow for two different configurations is tested as benchmark wall-bounded flows. Both the accuracy indicated by the threshold and efficiency in terms of degrees of freedom for the novel adaptation strategy are successfully gained compared with the wavelet-based adaptive LES method. Moreover, the newly proposed W-DDES resolves the typical log-layer match issue encountered in the conventional non-adaptive DDES method mainly due to the use of wavelet-based adaptive mesh refinement. The W-DDES capability for simulations of complex turbulent flows is validated by two other flow configurations – a subsonic channel flow with periodic hill constrictions and a supersonic flow over a compression ramp inducing the shock wave–turbulent boundary layer interaction. The current study serves as a crucial step towards construction of a unified wavelet-based adaptive hierarchical RANS/LES modelling framework, capable of performing simulations of varying fidelities from no-modelling direct numerical simulations to full-modelling RANS simulations.

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