Download or read book Direct Numerical Simulations of Channel Flows with Two Splitter Plates written by Anup Ganesh Gokarn and published by . This book was released on 2002 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, direct numerical simulations are performed for the evolution of a mixing layer in a reactor with two splitter plates at the inlet, for the first time. A splitter plate configuration is a well-studied geometry, known to induce mixing as a result of the Kelvin-Helmholtz instability in shear layers. Turbulent mixing processes are of great importance in reacting flows owing to the fact that turbulence induces reactants to mix rapidly thereby increasing the reaction rate. A turbulent mixing flow exhibits complex dynamic behavior and the advection of a passive scalar, such as a reactant, by the same flow reveals many phenomenological parallels with the behavior of the velocity field. Detailed field information is obtained by solving the unsteady Navier-Stokes equations. A time marching method, which utilizes an artificial compressibility formulation, is employed for transient solutions using a dual-time stepping technique. Finite difference schemes are used to discretize the equations. The two-dimensional simulations of the unsteady, spatially developing mixing layer are able to capture the large-scale vortical structures that are shed at the trailing edge of the splitter plates. The growth of the mixing layer is due to pairing of neighboring vortices. Instability of the flow increases as the velocity ratio decreases and the vortex rollups occur closer to the trailing edge of splitter plates. The vortex strength also increases with decreasing velocity ratio. The transport of a conserved passive scalar is examined to assess the mechanisms of entrainment and mixing within the shear flow. The scalars mix in the channel by means of advection and diffusion. Better mixing at lower velocity ratios is attained due to increased advection. Mean and RMS scalar profiles emphasize the fact that mixing is enhanced when the inner feed stream is much faster than the outer feed streams. The scalar probability density functions revealed the evolution of the mixing layer along the streamwise direction. Based on the simulated results, the validity of the turbulent viscosity and gradient diffusion closures were assessed. The study was extended to the three-dimensional mixing layer to set a foundation for future computational studies.
Download or read book Point Source Dispersion in a Direct Numerical Simulation of Turbulent Channel Flow written by Kostantinos Kontomaris and published by . This book was released on 1991 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dispersion of a scalar quantity from point sources located in a Direct Numerical Simulation of turbulent channel flow is studied. An algorithm for tracking fluid particles or molecular (or thermal) markers is developed and tested. Accurate estimates of a number of Lagrangian characteristics of the flow, necessary for the description of the diffusion process, are reported for the case of a point source in the center of the channel. The consequences of molecular diffusivity on the effectiveness of the turbulence to disperse a foreign substance (or heat) are also explored. A new method is proposed for calculating the effect of Peclet number on the Lagrangian property autocorrelation in isotropic turbulence. Computed property autocorrelations, from a simulated experiment of point source diffusion in the center of the channel, are also reported. Finally, results for the diffusion from point sources located at the channel walls are presented and discussed.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Self stratification on Channel Flows and Boundary Layers a Study Using Direct Numerical Simulations written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Techniques for Modeling Atmospheric Processes written by Prusov, Vitaliy and published by IGI Global. This book was released on 2017-06-16 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Meteorology has made significant strides in recent years due to the development of new technologies. With the aid of the latest instruments, the analysis of atmospheric data can be optimized. Computational Techniques for Modeling Atmospheric Processes is an academic reference source that encompasses novel methods for the collection and study of meteorological data. Including a range of perspectives on pertinent topics such as air pollution, parameterization, and thermodynamics, this book is an ideal publication for researchers, academics, practitioners, and students interested in instrumental methods in the study of atmospheric processes.
Download or read book Advances in Heat Transfer and Fluid Dynamics written by Mohammad Altamush Siddiqui and published by Springer Nature. This book was released on with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct numerical simulation of a strained and recovered channel flow with Reynolds Averaged Navier Stokes model comparisons written by Christopher Philip Yorke and published by . This book was released on 2004 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instability and Control of Massively Separated Flows written by Vassilis Theofilis and published by Springer. This book was released on 2015-01-03 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the outcome of the international meeting on instability, control and noise generated by massive flow separation that was organized at the Monash Center, in Prato, Italy, September 4-6, 2013. The meeting served as the final review of the EU-FP7 Instability and Control of Massively Separated Flows Marie Curie travel grant and was supported by the European Office of Aerospace Research and Development. Fifty leading specialists from twelve countries reviewed the progress made since the 50s of the last century and discussed modern analysis techniques, advanced experimental flow diagnostics and recent developments in active flow control techniques from the incompressible to the hypersonic regime. Applications involving massive flow separation and associated instability and noise generation mechanisms of interest to the aeronautical, naval and automotive industries have been addressed from a theoretical, numerical or experimental point of view, making this book a unique source containing the state-of-the-art in separated flow instability and its control.
Download or read book High Performance Computing on Vector Systems 2009 written by Sabine Roller and published by Springer Science & Business Media. This book was released on 2009-10-07 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the results of the Tera op Workbench, other projects related to High Performance Computing, and the usage of HPC installations at HLRS. The Tera op Workbench project is a collaboration between the High Performance C- puting Center Stuttgart (HLRS) and NEC Deutschland GmbH (NEC-HPCE) to s- port users in achieving their research goals using High Performance Computing. The rst stage of the Tera op Workbench project (2004–2008) concentrated on user’s applications and their optimization for the former ag ship of HLRS, a - node NEC SX-8 installation. During this stage, numerous individual codes, dev- oped and maintained by researchers or commercial organizations, have been a- lyzed and optimized. Within the project, several of the codes have shown the ability to outreach the TFlop/s threshold of sustained performance. This created the pos- bility for new science and a deeper understanding of the underlying physics. The second stage of the Tera op Workbench project (2008–2012) focuses on c- rent and future trends of hardware and software developments. We observe a strong tendency to heterogeneous environments on the hardware level, while at the same time, applications become increasingly heterogeneous by including multi-physics or multi-scale effects. The goal of the current studies of the Tera op Workbench is to gain insight in the developments of both components. The overall target is to help scientists to run their application in the most ef cient and most convenient way on the hardware best suited for their purposes.
Download or read book Numerical Simulation of Mixing Processes in Two dimensional Channel Flows written by Milan Karel Straka and published by . This book was released on 1985 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Numerical Simulation of Flow and Mass Transfer in Spacer filled Channels written by Alireza Mahdavifar and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 30th AIAA Fluid Dynamics Conference written by and published by . This book was released on 1999 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Turbulence Modelling and Experiments 2 written by F. Martelli and published by Elsevier. This book was released on 2014-06-28 with total page 1012 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today understanding turbulence is one of the key issues in tackling flow problems in engineering. Powerful computers and numerical methods are now available for solving flow equations, but the simulation of turbulence effects, which are nearly always important in practice, are still at an early stage of development. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulence momentum, heat and mass transfer. The 89 papers, including 5 invited papers, in this volume present and discuss new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The high standard of the contributions on the developing and testing of turbulent models attests to the world-wide interest this domain is currently attracting from researchers.
Download or read book Computational Wind Engineering 1 written by S. Murakami and published by Elsevier. This book was released on 2014-06-28 with total page 925 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this volume is to explore the challenges posed by the rapid development of Computational Fluid Dynamics (CFD) within the field of engineering. CFD is already essential to research concerned with fluid flow in civil engineering, and its further potential for application in wind engineering is highly promising. State-of-the-art papers from all over the world are contained here, illuminating the present parameters of the field, as well as suggesting fruitful areas for further research. Eleven papers have been contributed by invited speakers outstanding in the fields of CFD and wind engineering. This volume will serve as a vehicle to promote further development in computational wind engineering.
Download or read book Turbulent Flows 1994 written by American Society of Mechanical Engineers. Fluids Engineering Division. Summer Meeting and published by . This book was released on 1994 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1994-11 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt:
