Abstract
Large-Eddy Simulation (LES), Detached-Eddy Simulation (DES) and Scale-Adaptive Simulation (SAS) models are increasingly being used as engineering tools to predict complex flows where reference DNS or experimental data is not available. Frequently, the flow has not been studied previously and the required grid resolution is unknown. Industrial users studying these flows tend to be using commercial CFD codes and do not usually have access to high-performance computing facilities, making systematic grid-dependence studies unfeasible. There is a risk therefore that LES, DES and SAS simulations will be performed using overly coarse grids which may lead to unreliable predictions. The present work surveys a number of practical techniques that provide a means of assessing the quality of the grid resolution. To examine the usefulness of these techniques, a choked gas release in a ventilated room is examined using DES and SAS. The grid resolution measures indicate that overall the grids used are relatively coarse. Both DES and SAS models are found to be in poor agreement with experimental data and show greater grid sensitivity compared to RANS results using the SST model. The work highlights the need for grid-dependence studies and the dangers of using coarse grids.
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References
A. Hamins, A. Maranghides, K. B. McGrattan, T. Ohlemiller, and R. Anleitner. Experiments and modeling of multiple workstations burning in a compartment. Technical report, NIST NCSTAR 1-5E, Federal Building and Fire Safety Investigation of the World Trade Center Disaster, September 2005.
J. Mahaffy, B. Chung, F. Dubois, F. Dubois, E. Graffard, M. Heitsch, M. Henriksson, E. Komen, F. Moretti, T. Morii, P. Mühlbauer, U. Rohde, M. Scheuerer, B. L. Smith, C. Song, T. Watanabe, and G. Zigh. Best practice guidelines for the use of CFD in nuclear reactor safety applications. Technical report, NEA/CSNI/R(2007)5, OECD, 2007.
I. B. Celik, M. Klein, M. Freitag, and J. Janicka. Assessment measures for URANS/DES/LES: an overview with applications. J. Turbulence, 7(7):1–27, 2006.
Y. Addad, S. Benhamadouche, and D. Laurence. The negatively buoyant wall-jet: LES results. Int. J. Heat Fluid Flow, 25:795–808, 2004.
K. Van Maele and B. Merci. Application of RANS and LES field simulations to predict the critical ventilation velocity in longitudinally ventilated horizontal tunnels. Fire Safety Journal, 43:598–609, 2008.
A. K. Kuczaj and E. M. J. Komen. Large-eddy simulation study of turbulent mixing in a T-junction. In Proc. Experiments and CFD Code Applications to Nuclear Reactor Safety, (XCFD4NRS), CEA, Grenoble, France, September 2008.
B. J. Geurts and J. Fröhlich. A framework for predicting accuracy limitations in large eddy simulation. Phys. Fluids, 14:41–44, 2002.
S. E. Gant. Quality and reliability issues with large-eddy simulation. Report RR656, Health and Safety Executive, UK, 2008.
I. B. Celik, Z. N. Cehreli, and I. Yavuz. Index of resolution quality for large eddy simulations. J. Fluids Eng., 127:949–958, 2005.
M. Klein. An attempt to assess the quality of large eddy simulations in the context of implicit filtering. Flow, Turbulence and Combustion, 75:131–147, 2005.
T. Brandt. Study on numerical and modelling errors in LES using a priori and a posteriori testing. PhD thesis, Department of Mechanical Engineering, Helsinki University of Technology, Espoo, Finland, 2007.
M. J. Ivings, S. P. Clarke, S. E. Gant, B. Fletcher, A. Heater, D. J. Pocock, D. Pritchard, R. Santon, and C. J. Saunders. Area classification for secondary releases from low pressure natural gas systems. Report RR630, Health and Safety Executive, UK, 2008.
M. Strelets. Detached eddy simulation of massively separated flows. In Paper AIAA 2001-0879, Reno, Nevada, 2001. 39th Aerospace Science Meeting & Exhibit.
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Gant, S.E. (2010). Practical Quality Measures for Large-Eddy Simulation. In: Armenio, V., Geurts, B., Fröhlich, J. (eds) Direct and Large-Eddy Simulation VII. ERCOFTAC Series, vol 13. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3652-0_33
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DOI: https://doi.org/10.1007/978-90-481-3652-0_33
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