LES resolution requirements can thus become prohibitively expensive for practical flows and regimes of interest. Implicit LES ILES effectively addresses the seemingly insurmountable issues posed to LES by under-resolution, by relying on the use of SGS modeling and filtering provided implicitly by physics-capturing numerics of a broad class of high-resolution, non-linear finite-volume methods. Increasing interest in ILES techniques is reflected in recent dedicated sections in archival journals 2 , 3 , dedicated chapters in CFD textbooks 4 , and by the publication of the first comprehensive book synthesizing our current understanding of the theoretical basis and accomplishments of ILES 5.
Five papers selected from the invited sessions and two other separately invited papers were assembled in the present special issue of JFE to provide a broad state-of-the-art perspective. The first four papers deal with fundamental studies using modified equation analysis and tests in basic cases for which good reference data are available.
Grinstein and Fureby discuss a class of flux-limiting methods used for ILES in both, incompressible and compressible regimes, focusing on their commonalities and basic performance. Comparative verification tests of ILES and classical LES are used to address performance of the various strategies in predicting transition and turbulence decay. Mosedale and Drikakis present an assessment of very high-order ILES models for multi-component compressible flows using WENO methods with fifth- and ninth-order of accuracy.
Rider addresses SGS modeling issues arising from the application of ILES in the simulation of compressible turbulent flows, focusing on the form of the effective SGS model for the conservation of mass equations. Thornber and Drikakis report on ILES studies of multi-component compressible turbulent mixing featuring complex flow physics such as Richtmyer-Meshkov instability and transition to turbulence, including detailed comparisons against shock-tube experiments.
The last three papers address issues in simulations of extremely complex flows of interest in engineering, threat reduction management, and geophysics, for which whole-domain scalable laboratory or field studies are typically impossible or very difficult. Deterministic simulation studies are very expensive and critically constrained by difficulties in modeling and validating all the relevant physical sub-processes, as well as in acquiring all the necessary and relevant boundary condition information.
Fureby first discusses the application of ILES to a variety of complex engineering-type applications ranging from incompressible external flows around typical naval applications to external and internal supersonic flows in aerospace applications. Large scale urban simulations are then discussed by Patnaik et al. Airborne contaminant transport in cities presents challenging new requirements for computational fluid dynamics. Turbulence is one of the most important of these phenomena and yet the overall problem is sufficiently difficult that the turbulence must be included efficiently with an absolute minimum of extra memory and computing time.
Finally, Smolarkiewicz et al. The difficulties of modeling the dynamics of the global ocean and atmosphere are compounded by the broad range of significant length scales and by the relative smallness of the vertical height of these boundary layers in comparison to their horizontal extent, which accentuates the importance of the backscatter of energy to the larger scales of motion.
The authors contributing to this special issue are grateful to the JFE editors for their careful and expeditious handling of the manuscripts, in turn making possible timely publication of these works. All involved would like to thank the JFE editor, Joe Katz, for recognizing the timeliness and importance of this subject, and offer sincere thanks to Laurel Murphy for her patience and skill in coordinating various aspects of the review and processing of the papers.
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Implicit Large Eddy Simulation: Computing Turbulent Fluid Dynamics
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Progress over the last decade is reviewed, and the most important and promising directions for future research are discussed. Already have an account? Login in here. Mechanical Engineering Reviews. Journal home Advance online publication Journal issue About the journal.