Journal ArticleDOI
A proposed modification of the Germano subgrid‐scale closure method
TLDR
In this paper, the subgrid-scale closure method developed by Germano et al. is modified by use of a least squares technique to minimize the difference between the closure assumption and the resolved stresses.Abstract:
The subgrid‐scale closure method developed by Germano et al. is modified by use of a least squares technique to minimize the difference between the closure assumption and the resolved stresses. This modification removes a source of singularity and is believed to improve the method’s applicability.read more
Citations
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Large eddy simulation of free-stream turbulence effects on heat transfer to a high-pressure turbine cascade
TL;DR: In this article, a large eddy simulation of an uncooled, transonic, linear high-pressure turbine vane cascade has been pursued using a high-order numerical method with about 83 million grid points.
Journal ArticleDOI
Gravity currents impinging on bottom-mounted square cylinders: flow fields and associated forces
TL;DR: In this paper, the effect of gravity current on a bottom-mounted square cylinder is investigated by means of high-resolution Navier-Stokes simulations, showing that the maximum drag coefficient can reach a value of 3, with the quasi-steady value being O(1), which should aid in selecting a design drag coefficient for submarine structures under the potential impact of gravity currents.
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Numerical Studies of Finite Element Variational Multiscale Methods for Turbulent Flow Simulations
Volker John,Adela Kindl +1 more
TL;DR: In this article, different realizations of variational multiscale (VMS) methods within the framework of finite element methods are studied in turbulent channel flow simulations, and the simulations are performed on grids for which a Direct Numerical Simulation blows up in finite time.
Journal ArticleDOI
Aero-acoustics prediction of a vertical axis wind turbine using Large Eddy Simulation and acoustic analogy
Masoud Ghasemian,Amir Nejat +1 more
TL;DR: In this article, the authors carried out numerical prediction for aerodynamic noise radiated from an H-Darrieus Vertical Axis Wind Turbine using Incompressible LES (Large Eddy Simulation) to obtain the instantaneous turbulent flow field.
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Effects of the inlet angle on the flow pattern and pressure drop of a cyclone with helical-roof inlet
TL;DR: In this article, the effects of inlet angle on the flow pattern and pressure drop in cyclones have been numerically investigated using Large Eddy Simulations with the dynamic Smagorinsky-Lilly subgrid-scale.
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
A dynamic subgrid‐scale eddy viscosity model
TL;DR: In this article, a new eddy viscosity model is presented which alleviates many of the drawbacks of the existing subgrid-scale stress models, such as the inability to represent correctly with a single universal constant different turbulent fields in rotating or sheared flows, near solid walls, or in transitional regimes.
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A numerical study of three-dimensional turbulent channel flow at large Reynolds numbers
TL;DR: In this article, the three-dimensional, primitive equations of motion have been integrated numerically in time for the case of turbulent, plane Poiseuille flow at very large Reynolds numbers.
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A dynamic subgrid‐scale model for compressible turbulence and scalar transport
TL;DR: Germano et al. as discussed by the authors generalized the dynamic subgrid-scale (SGS) model for the large eddy simulation (LES) of compressible flows and transport of a scalar.
On the application of the eddy viscosity concept in the Inertial sub-range of turbulence
TL;DR: In this paper, it was shown that an eddy diffusion hypothesis for use in numerical solutions of turbulent flow problems is consistent with the existence of an inertial subrange at the smallest resolvable scale of the numerical model.