Download Computation of Three-Dimensional Complex Flows: Proceedings by S. Ahmed, B. G. Sherlock, Q. G. Rayer (auth.), Michel PDF

By S. Ahmed, B. G. Sherlock, Q. G. Rayer (auth.), Michel Deville, Spyros Gavrilakis, Inge L. Ryhming (eds.)

The IMACS-COST convention on "Computational Fluid Dynamics, third-dimensional complicated Flows" was once held in Lausanne, Switzerland, September thirteen - 15, 1995. The scien­ tific sponsors of the convention have been • IMACS: overseas organization for arithmetic and desktops in Simulation, • expense: eu Cooperation within the box of clinical and Technical study, • ERCOFTAC: ecu study group on circulate, Turbulence and Combus­ tion. The medical pursuits of the IMACS and ERCOFTAC institutions are heavily regarding computational fluid dynamics while the ecu Union programme rate covers a much broader variety of clinical matters. the fee' motion F1' introduced in 1992 through Professor I. L. Ryhming offers with "Complex three-d viscous flows: prediction, modelling, manipulation and control". It has numerous subtopics between which numerical equipment and modelling concerns are the most components of study and improvement. The assembly accumulated jointly eighty-seven scientists, engineers and researchers from sev­ enteen nations: Belgium, Finland, France, Germany, Greece, Hong Kong, Israel, Italy, Japan, the Netherlands, Norway, Russia, Spain, Sweden, Switzerland, uk, usa. All significant numerical approximation equipment have been mentioned: finite variations, finite volumes, finite components, spectral tools. the subjects lined through the sixty communications spanned the whole spectrum of computational fluid dynam­ ics: direct numerical simulation, large-eddy simulation, turbulence modelling, unfastened floor flows, non Newtonian fluids, thermal convection, etc.

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Extra resources for Computation of Three-Dimensional Complex Flows: Proceedings of the IMACS-COST Conference on Computational Fluid Dynamics Lausanne, September 13–15, 1995

Example text

The first modeled blast wave diffraction inside the B-2 level of the World Trade Center. The second employed a coupled CFD/CSD methodology to model blast wave diffraction about a responding truck. The WTC blast simulation investigated long duration shock diffraction about hundreds of structures. Several interesting 3-D shock diffraction processes were identified. Among these are the formation of "hot spots" resulting from three-dimensional wave focusing, shock reverberation between cars, shock diffraction about cars and columns, and the formation of three-dimensional Mach stems.

2 RNG k - E = = = = model (20) In (20), the renormalization group (RNG) theory was applied to derive the k - E turbulence model. In this theory, the small scale fluctuations are removed successively from the governing equations leading to averaged equations. The resulting k - E model has an extra term R. in the E-equation, for which a model is introduced, which reads: R. 015. The model constants following from the RNG theory are: C,. 7179. e. in impinging flows. This phenomenon is a consequence of the inability of eddy viscosity models to simulate correctly the difference in normal Reynolds stresses governing the production of k in such regions.

273 ms, FLOW AROUND A SURFACE MOUNTED CUBICAL OBSTACLE: COMPARISON OF LES AND RANS-RESULTS M. Breuer·, D. Lakehal, W. Rodi Institut fiir Hydromechanik, Universitat Karlsruhe (TH), Kaiserstr. 12, D-76128 Karlsruhe, Germany SUMMARY The paper deals with a comparative study of LES and RANS (k-e model) results for a typical bluff-body flow, namely the flow around a surface mounted cubical obstacle placed in a plane channel. For this test case detailed experimental data (Re=40,000) are available [11].

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