Inflow conditions for large-eddy simulations of mixing layers

2000 ◽  
Vol 12 (4) ◽  
pp. 935-938 ◽  
Author(s):  
N. Li ◽  
E. Balaras ◽  
U. Piomelli
Keyword(s):  
Large Eddy Simulations ◽  
Mixing Layers ◽  
Large Eddy ◽  
Inflow Conditions

scholarly journals Large-Eddy Simulations of Two In-Line Turbines in a Wind Tunnel with Different Inflow Conditions

Energies ◽  
2017 ◽  
Vol 10 (6) ◽  
pp. 821 ◽  
Author(s):  
Umberto Ciri ◽  
Giovandomenico Petrolo ◽  
Maria Salvetti ◽  
Stefano Leonardi
Keyword(s):  
Wind Tunnel ◽  
Large Eddy Simulations ◽  
Large Eddy ◽  
Inflow Conditions

Study of Turbulent Flow Structures of a Practical Steady Engine Head Flow Using Large-Eddy Simulations

2006 ◽  
Vol 128 (6) ◽  
pp. 1181-1191 ◽  
Author(s):  
V. Huijnen ◽  
L. M. T. Somers ◽  
R. S. G. Baert ◽  
L. P. H. de Goey ◽  
C. Olbricht ◽  
...  
Keyword(s):  
Experimental Data ◽  
Decisive Role ◽  
Large Eddy Simulations ◽  
Navier Stokes ◽  
Upstream Region ◽  
Flow Structures ◽  
Complex Flow ◽  
Production Type ◽  
Large Eddy ◽  
Inflow Conditions

The prediction performance of two computational fluid dynamics codes is compared to each other and to experimental data of a complex swirling and tumbling flow in a practical complex configuration. This configuration consists of a flow in a production-type heavy-duty diesel engine head with 130-mm cylinder bore. One unsteady Reynolds-averaged Navier-Stokes (URANS)-based simulation and two large-eddy simulations (LES) with different inflow conditions have been performed with the KIVA-3V code. Two LES with different resolutions have been performed with the FASTEST-3D code. The parallelization of the this code allows for a more resolved mesh compared to the KIVA-3V code. This kind of simulations gives a complete image of the phenomena that occur in such configurations, and therefore represents a valuable contribution to experimental data. The complex flow structures gives rise to an inhomogeneous turbulence distribution. Such inhomogeneous behavior of the turbulence is well captured by the LES, but naturally damped by the URANS simulation. In the LES, it is confirmed that the inflow conditions play a decisive role for all main flow features. When no particular treatment of the flow through the runners can be made, the best results are achieved by computing a large part of the upstream region, once performed with the FASTEST-3D code. If the inflow conditions are tuned, all main complex flow structures are also recovered by KIVA-3V. The application of upwinding schemes in both codes is in this respect not crucial.

Comparison of Mann Turbulence and atmospheric turbulence as inflow conditions on a wind turbine in large-eddy simulations (LES)

2021 ◽  
Author(s):  
Linus Wrba ◽  
Antonia Englberger
Keyword(s):  
Wind Turbine ◽  
Atmospheric Surface Layer ◽  
Turbine Blades ◽  
Potential Temperature ◽  
Large Eddy Simulations ◽  
Wind Turbine Blades ◽  
Large Eddy ◽  
The Impact ◽  
Inflow Conditions ◽  
Blade Element

<p>This study deals with different inflow conditions on wind-turbines in LES in order to analyse the impact on the wake. The wind turbine regarded in this study has a hub height of 57.19 m while the radius of the blade measures 40m. Furthermore, the blade element momentum method (BEM) is used to calculate the development forces of the wind turbine blades on the flow. First, the syntheticly generated turbulence of a Mann[1] box generator is considered. Second, atmospheric boundary layer simulations from Englberger and Dörnbrack (2018) are applied as inflow conditions for the three wind components and the potential temperature to calculate the wake of the wind turbine. The distribution of turbulent kinetic energy in eddys of different sizes is worked out in their energy spectrum.The inflow conditions represent the -5/3 Kolmogorov spectrum. The wake characteristics are evaluated for both inflow datasets and the arising differences are discussed in this study</p><div><br><div> <p>[1] Mann, J. (1994). The spatial structure of neutral atmospheric surface-layer turbulence. Journal of fluid mechanics 273</p> </div> </div><div><br><div> <p> </p> </div> </div>

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