Download or read book Parallel Multigrid DNS LES Methods for Time Dependent Compressible Turbulent Flow written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past two years (12/00-3/03), we have developed a very efficient and reliable direct numerical simulation (DNS) and large eddy simulation (LES) software (DNSUTA) for compressible flow in a curvilinear coordinates which is a continuation of our previous effort supported by AFOSR. The software includes a high-quality grid generation code which can generate smooth and near-orthogonal, body-fitted grids and a parallel efficient flow solver which applies sixth-order compact scheme, eighth-order filter, LU-SGS flow solver, non-reflecting boundary condition, high-order weighted compact scheme for shock capturing, structure function sub-grid model, and MPI parallel computation. The code has been successfully used for prediction of flow transition around flat plate and airfoils with various attack angles. The code has also been used for flow separation control for low Reynolds airfoils with steady and pulsed blowing jets. All of these simulations are real time dependent, 3-D, with general geometry and have demonstrated qualitative or quantitative agreement with experiment or theoretical work. We believe the topics described above are very challenging and our accomplishment is very significant for both basic science and Air Force mission. The high-order weighted compact scheme and non-reflecting boundary conditions in a curvilinear coordinate are the original work conducted by us which is a significant contribution to the CFD community.

Download or read book Parallel Multigrid DNS LES Methods for Time dependent Turbulent Flow written by Chaoqun Liu and published by . This book was released on 2003 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Parallel Implicit Multigrid Method for Direct Numerical Simulation of Time Dependent Compressible Turbulent Flow Around Flight Vehicles written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An oblique transition process of a flat-plate boundary layer at a free-stream Mach number of M (infinity) =4.5 and a Reynolds number of 10000 based on free-stream velocity and inflow displacement thickness is simulated as the validation of the code. Four transitional stages are observed: the linear and weakly nonlinear growth, the appearance of staggered A-vortex patterns, the evolution of A-vortex into hairpin vortex, the breakdown of hairpin vortical structures. The evolution of averaged quantities, such as the skin-friction coefficient, the mean velocity profile, the boundary layer thickness are all computed and found agreed very well with theoretic and experimental results. For complex geometry, 2D and 3D numerical grid generation method are used to generate high-quality meshes. Subsonic flow around 2D NACA 0012 airfoil and 3D Delta wing with a large angle of attack are investigated with large eddy simulation. Flow separations and large eddy structures are observed, the interactions between vortical structures will be studied.

Download or read book Analysis of Transition to Turbulence for a Boundary layer Using Spatial DNS with a Parallel Multigrid Kernel written by Kiranmai Bhaganagar and published by . This book was released on 2001 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Novel Algorithm for DNS LES of Compressible Turbulent Flows written by Yucheng Hou and published by . This book was released on 2007 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 27th AIAA Fluid Dynamics Conference written by and published by . This book was released on 1996 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Parallel Multigrid Method for Predicting Compressible Flow in Turbomachinery microform written by Eric L. (Eric Lik-Hun) Li and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2004 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: A parallel multigrid method is developed for solving two-dimensional inviscid compressible flows on body-fitted multi-block mesh. The method utilizes a Godunov-type up-winding scheme, exact and approximate Riemann solvers and limited reconstruction to achieve higher-order spatial accuracy. The computation is carried out on a quadrilateral grid that is divided into blocks to facilitate scalable performance on parallel computers. A Full Approximation Storage multigrid scheme is employed to accelerate the convergence of an explicit multistage time integration scheme. Several example cases, including the flow about NASA rotor 67, are used to validate the parallel algorithm and to investigate its convergence and parallel performance. The effectiveness of the multigrid method is demonstrated and good convergence acceleration is obtained, particularly for problems of increasing complexity. The parallel efficiency of the method is found to be dependant on the problem size. The potential of the algorithm for solving large scale and three-dimensional problems is indicated.

Download or read book TILDA Towards Industrial LES DNS in Aeronautics written by Charles Hirsch and published by Springer Nature. This book was released on 2021-06-28 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers detailed insights into new methods for high-fidelity CFD, and their industrially relevant applications in aeronautics. It reports on the H2020 TILDA project, funded by the European Union in 2015-2018. The respective chapters demonstrate the potential of high-order methods for enabling more accurate predictions of non-linear, unsteady flows, ensuring enhanced reliability in CFD predictions. The book highlights industrially relevant findings and representative test cases on the development of high-order methods for unsteady turbulence simulations on unstructured grids; on the development of the LES/DNS methodology by means of multilevel, adaptive, fractal and similar approaches for applications on unstructured grids; and on leveraging existent large-scale HPC networks to facilitate the industrial applications of LES/DNS in daily practice. Furthermore, the book discusses multidisciplinary applications of high-order methods in the area of aero-acoustics. All in all, it offers timely insights into the application and performance of high-order methods for CFD, and an extensive reference guide for researchers, graduate students, and industrial engineers whose work involves CFD and turbulence modeling.

Download or read book Three dimensional Time Dependent Computation of Turbulent Flow written by Dochan Kwak and published by . This book was released on 1975 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in DNS LES written by Chaoqun Liu and published by . This book was released on 1997 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of Aircraft written by and published by . This book was released on 2009 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book IDIHOM Industrialization of High Order Methods A Top Down Approach written by Norbert Kroll and published by Springer. This book was released on 2015-01-02 with total page 683 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes the main findings of the EU-funded project IDIHOM (Industrialization of High-Order Methods – A Top-Down Approach). The goal of this project was the improvement, utilization and demonstration of innovative higher-order simulation capabilities for large-scale aerodynamic application challenges in the aircraft industry. The IDIHOM consortium consisted of 21 organizations, including aircraft manufacturers, software vendors, as well as the major European research establishments and several universities, all of them with proven expertise in the field of computational fluid dynamics. After a general introduction to the project, the book reports on new approaches for curved boundary-grid generation, high-order solution methods and visualization techniques. It summarizes the achievements, weaknesses and perspectives of the new simulation capabilities developed by the project partners for various industrial applications, and includes internal- and external-aerodynamic as well as multidisciplinary test cases.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1991 with total page 1380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2003 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computational Fluid Dynamics written by Jiri Blazek and published by Elsevier. This book was released on 2005-12-20 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Fluid Dynamics (CFD) is an important design tool in engineering and also a substantial research tool in various physical sciences as well as in biology. The objective of this book is to provide university students with a solid foundation for understanding the numerical methods employed in today’s CFD and to familiarise them with modern CFD codes by hands-on experience. It is also intended for engineers and scientists starting to work in the field of CFD or for those who apply CFD codes. Due to the detailed index, the text can serve as a reference handbook too. Each chapter includes an extensive bibliography, which provides an excellent basis for further studies.