Journal ArticleDOI
Assessment of the vortex method for Large Eddy Simulation inlet conditions
TLDR
In this paper, the Vortex Method (VM) based boundary condition of Sergent (2002) was implemented in the general purpose CFD solver Fluent, and it was shown that the VM offers a relatively inexpensive and accurate way to generate random fluctuations representing a turbulent flow field at the inlet.Abstract:
The Vortex Method (VM) based boundary condition of Sergent (2002) was implemented in the general purpose CFD solver Fluent. It is shown that the VM offers a relatively inexpensive and accurate way to generate random fluctuations representing a turbulent flow field at the inlet. Since the generated velocity field is temporally and spatially correlated, it is a much more realistic representation of turbulence than the one obtained with a simple velocity distribution, using a random generator. Validations are reported for fully developed turbulent channel flow, pipe flow and separated hill flow.read more
Citations
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Journal ArticleDOI
Hybrid LES/RANS methods for the simulation of turbulent flows
TL;DR: A coherent review of the various approaches proposed in the recent literature on hybrid LES/RANS approaches is presented to provide information on how to distinguish different methods and their ingredients and to further the understanding of inherent limitations and difficulties.
Journal ArticleDOI
Inlet conditions for large eddy simulation: A review
Gavin Tabor,M.H. Baba-Ahmadi +1 more
TL;DR: In this paper, the authors present a review of methods for computing inlet conditions for LES, including pre-cursor simulation and synthesis, and implement their own novel versions of these using the code OpenFOAM.
Journal ArticleDOI
CFD simulation of near-field pollutant dispersion on a high-resolution grid : a case study by LES and RANS for a building group in downtown Montreal
TL;DR: In this paper, the performance of two different modeling approaches (RANS standard k-e and LES) applied to pollutant dispersion in an actual urban environment: downtown Montreal is evaluated.
Journal ArticleDOI
Synthetic Turbulence Generators for RANS-LES Interfaces in Zonal Simulations of Aerodynamic and Aeroacoustic Problems
TL;DR: In this paper, the authors present the detailed formulation and validation results of simple and robust procedures for the generation of synthetic turbulence aimed at providing artificial turbulent content at the RANS-to-LES interface within a zonal wall-modelled LES of attached and mildly separated wall-bounded flows.
Journal ArticleDOI
Experimental and numerical investigation of a three-dimensional vertical-axis wind turbine with variable-pitch
TL;DR: In this paper, a combined experimental and numerical investigation is carried out to study the performance of a micro vertical-axis wind turbine (VAWT) with variable pitch, which involves a low aspect ratio (AR) three straight blades with struts.
References
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Journal ArticleDOI
General circulation experiments with the primitive equations
TL;DR: In this article, an extended period numerical integration of a baroclinic primitive equation model has been made for the simulation and the study of the dynamics of the atmosphere's general circulation, and the solution corresponding to external gravitational propagation is filtered by requiring the vertically integrated divergence to vanish identically.
Journal ArticleDOI
Subgrid-scale stress modelling based on the square of the velocity gradient tensor
Franck Nicoud,F. Ducros +1 more
TL;DR: In this paper, a subgrid scale model is proposed for large eddy simulations in complex geometries, which accounts for the effects of both the strain and the rotation rate of the smallest resolved turbulent fluctuations.
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Direct numerical simulation of turbulent flow over a backward-facing step
Hung Le,Parviz Moin,John Kim +2 more
TL;DR: In this paper, a simulation of the Navier-Stokes equations of a backward-facing step flow was performed at a Reynolds number of 5100 based on the step height h and inlet free-stream velocity.
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A pressure-based method for unstructured meshes
S. R. Mathur,Jayathi Y. Murthy +1 more
TL;DR: A cell-centered equal-order formulation for multidimensional incompressible flows that is applied to benchmark problems using a variety of quadrilateral/hexahedral, triangular/tetrahedral, and hybrid meshes, and is shown to perform satisfactorily.
Journal ArticleDOI
The effect of numerical errors and turbulence models in large-eddy simulations of channel flow, with and without explicit filtering
TL;DR: It is found that for explicit filtering, increasing the reconstruction levels for the RSFS stress improves the mean velocity as well as the turbulence intensities, when compared to LES without explicit filtering.