scholarly journals Applications of large eddy simulation methods to gyrokinetic turbulence

2014 ◽  
Vol 21 (3) ◽  
pp. 032304 ◽  
Author(s):  
A. Bañón Navarro ◽  
B. Teaca ◽  
F. Jenko ◽  
G. W. Hammett ◽  
T. Happel ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Simulation Methods ◽  
Eddy Simulation ◽  
Large Eddy

Comparison of Large Eddy Simulation Methods for Flows Over Gas Turbine Blades

2007 ◽  
Author(s):  
M. Karimi ◽  
M. Paraschivoiu
Keyword(s):  
Experimental Data ◽  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Compressible Flows ◽  
Turbine Blades ◽  
Classical Problem ◽  
Numerical Dissipation ◽  
Simulation Methods ◽  
Eddy Simulation ◽  
Large Eddy

In recent years there has been a considerable effort toward applying large eddy simulation methods (LES) to real industrial problems. However, there are still several challenges to be addressed to achieve a reliable LES solution, especially in the context of compressible flows. Furthermore, complex geometries require the unstructured meshes which then interdict the use of very high order schemes. Therefore, LES models are mainly derived and tested on classical problem of simple geometry for incompressible flow and based on higher order schemes. Here, the flow over a gas turbine blade at high Reynolds and Mach numbers is investigated using a mixed finite-volume-finite-element method. Implicit LES method (ILES) as well as Smagorinsky and its dynamic version have been studied. Different variations of the Smagorinsky method have been examined too. The interaction of the numerical dissipation of the scheme with LES models has been explored. The results show the capability of the ILES to take into account the effective viscosity of the flow and the negligible difference of the different LES models in this flow condition. Fairly good agreement with experimental data is found which is superior to RANS results. It is found that there are still some challenges in industrial LES applications which have to be addressed to lead to a better agreement with experimental data.

Comparison of flow characteristics around an equilateral triangular cylinder via PIV and Large Eddy Simulation methods

2017 ◽  
Vol 55 ◽  
pp. 23-36 ◽  
Author(s):  
Sercan Yagmur ◽  
Sercan Dogan ◽  
Muharrem Hilmi Aksoy ◽  
Ilker Goktepeli ◽  
Muammer Ozgoren
Keyword(s):  
Large Eddy Simulation ◽  
Flow Characteristics ◽  
Simulation Methods ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation

1996 ◽  
Author(s):  
Joel H. Ferziger
Keyword(s):  
Numerical Simulation ◽  
Large Eddy Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Turbulent Flows ◽  
Flow Simulation ◽  
Simulation Methods ◽  
Eddy Simulation ◽  
Simulation Techniques ◽  
Large Eddy

Over a decade ago, the author (Ferziger, 1983) wrote a review of the then state-of-the-art in direct numerical simulation (DNS) and large eddy simulation (LES). Shortly thereafter, a second review was written by Rogallo and Moin (1984). In those relatively early days of turbulent flow simulation, it was possible to write comprehensive reviews of what had been accomplished. Since then, the widespread availability of supercomputers has led to an explosion in this field so, although the subject is undoubtedly overdue for another review, it is not clear that the task can be accomplished in anything less than a monograph. The author therefore apologizes in advance for omissions (there must be many) and for any bias toward the accomplishments of people on the west coast of North America. In the earlier review, the author listed six approaches to the prediction of turbulent flow behavior. The list included: correlations, integral methods, single-point Reynolds-averaged closures, two-point closures, large eddy simulation and direct numerical simulation. Even then the distinction between these methods was not always clear; if anything, it is less clear today. It was possible in the earlier review to give a relatively complete overview of what had been accomplished with simulation methods. Since then, simulation techniques have been applied to an ever expanding range of flows so a thorough review of simulation results is no longer possible in the space available here. Simulation techniques have become well established as a means of studying turbulent flows and the results of simulations are best presented in combination with experimental data for the same flow. There is also a danger that the success of simulation methods will lead to attempts to apply them too soon to flows which the models and techniques are not ready to handle. To some extent, this is already happening. Direct numerical simulation (DNS) is a method in which all of the scales of motion of a turbulent flow are computed. A DNS must include everything from the large energy-containing or integral scales to the dissipative scales; the latter is usually taken to be the viscous or Kolmogoroff scales.

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