Large Eddy Simulation of the Flow Around a High-lift Airfoil
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Published: 2000
Total Pages: 72
ISBN-13:
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Published: 2000
Total Pages: 72
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DOWNLOAD EBOOKAuthor: Lars Davidson
Publisher: Springer Science & Business Media
Published: 2012-09-22
Total Pages: 246
ISBN-13: 3540364579
DOWNLOAD EBOOKLarge Eddy Simulation is a relatively new and still evolving computatio nal strategy for predicting turbulent flows. It is now widely used in research to elucidate fundamental interactions in physics of turbulence, to predict phe nomena which are closely linked to the unsteady features of turbulence and to create data bases against which statistical closure models can be asses sed. However, its applicability to complex industrial flows, to which statisti cal models are applied routinely, has not been established with any degree of confidence. There is, in particular, a question mark against the prospect of LES becoming an economically tenable alternative to Reynolds-averaged N avier-Stokes methods at practically high Reynolds numbers and in complex geometries. Aerospace flows pose particularly challenging problems to LES, because of the high Reynolds numbers involved, the need to resolve accura tely small-scale features in the thin and often transitional boundary layers developing on aerodynamic surfaces. When the flow also contains a separated region - due to high incidence, say - the range and disparity of the influen tial scales to be resolved is enormous, and this substantially aggravates the problems of resolution and cost. It is just this combination of circumstances that has been at the heart of the project LESFOIL to which this book is devoted. The project combined the efforts, resources and expertise of 9 partner organisations, 4 universities, 3 industrial companies and 2 research institu tes.
Author: S. Dahlstrom
Publisher:
Published: 2003
Total Pages:
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DOWNLOAD EBOOKAuthor: Parviz Moin
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Published: 1995
Total Pages: 18
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DOWNLOAD EBOOKAuthor: Jaber Hmoud Almutairi
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Published: 2010
Total Pages:
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DOWNLOAD EBOOKAuthor: Omar Ameen Qazi
Publisher:
Published: 2007
Total Pages: 119
ISBN-13:
DOWNLOAD EBOOKAuthor:
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Published: 1998
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKThis report describes the application of Large Eddy Simulations (LES) to turbulent flow over an airfoil. Two different approaches have been used, a second-order finite-difference solver on structured grid and a finite-element solver on unstructured grid. Results are presented for the flow around a NACA 4412 airfoil at maximum lift. The diversity of flow characteristics encountered in this flow include laminar, transitional and turbulent boundary layers, flow separation, unstable free shear layers and a wake. while Reynolds-averaged Navier-Stokes simulations (RANS) have had some success when tuned to flows dominated by one such flow characteristic, this variety of flow features taxes the presently available RANS models and presents an excellent opportunity to validate the utility of the dynamic SGS model for LES. Work has also been conducted on high order methods, both for the unstructured and the structured approach.
Author: Maria Vittoria Salvetti
Publisher: Springer
Published: 2019-02-02
Total Pages: 562
ISBN-13: 3030049159
DOWNLOAD EBOOKThis book gathers the proceedings of the 11th workshop on Direct and Large Eddy Simulation (DLES), which was held in Pisa, Italy in May 2017. The event focused on modern techniques for simulating turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structures, as Direct Numerical Simulation (DNS), Large-Eddy Simulation (LES) or hybrid models based on a combination of LES and RANS approaches. In light of the growing capacities of modern computers, these approaches have been gaining more and more interest over the years and will undoubtedly be developed and applied further. The workshop offered a unique opportunity to establish a state-of-the-art of DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows and to discuss about recent advances and applications. This volume contains most of the contributed papers, which were submitted and further reviewed for publication. They cover advances in computational techniques, SGS modeling, boundary conditions, post-processing and data analysis, and applications in several fields, namely multiphase and reactive flows, convection and heat transfer, compressible flows, aerodynamics of airfoils and wings, bluff-body and separated flows, internal flows and wall turbulence and other complex flows.
Author: Bernard Geurts
Publisher: Springer Science & Business Media
Published: 2013-06-29
Total Pages: 543
ISBN-13: 9401712638
DOWNLOAD EBOOKThis volume contains the proceedings of the 2001 DLES4 workshop. It describes and discusses state-of-the-art modeling and simulation approaches for complex flows. Fundamental turbulence and modeling issues but also elements from modern numerical analysis are at the heart of this field of interest.