Download or read book Direct Numerical Simulation of a Forced Transitional Plane Wall Jet written by Miguel R. Visbal and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulations of Wall Jets written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document summarizes the three year investigation of transitional and turbulent wall jets using direct numerical simulation (DNS) and large eddy simulation (LES). Towards this end, a three-dimensional, incompressible Navier-Stokes code developed in our research group for DNS of boundary-layer transition was adapted to the wall jet geometry. The code is based on the spatial model and is fourth-order accurate. For the LES, a Smagorinsky based subgrid-scale turbulence model and explicit fourth-order accurate compact filtering were incorporated. As an initial condition, a base flow close to Glauert's similarity solution of the laminar wall jet was employed. This flow was forced by blowing and suction through a slot in the wall. Periodic forcing was used for investigating primary and secondary instabilities in transitional wall jets (Re=2OO) We discovered competing two-dimensional (2-D) and three-dimensional (3-D) instability mechanisms which can be influenced significantly by the type of forcing. 2-D large/amplitude forcing produces (2-D) large coherent structures which reduce wall shear but may lead to ejections of vortices from the wall and even to a detachment of the wall jet. Additional 3-D forcing weakens these coherent structures (especially in the near-wall region) and can thus prevent vortex ejections. In our LES of turbulent wall jets, rapid breakdown to turbulence was triggered by large/amplitude 3-D random forcing. Despite the purely 3-D forcing, 2-D coherent structures still emerge in the free shear layer-like outer region, an indication of the strong 2-D instability of the wall jet. A fully turbulent mean flow which compares well with experiments is obtained for higher Reynolds numbers (Re=2OOO).

Download or read book 29th AIAA Fluid Dynamics Conference written by and published by . This book was released on 1998 with total page 532 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 974 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 2007 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A High order Compact Finite difference Scheme for Large eddy Simulation of Active Flow Control written by Donald Pasquale Rizzetta and published by . This book was released on 2008 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational approach for performing large-eddy simulation (LES) of flows with active control is summarized. Simulation of these problems typically characterized by small-scale fluid structures cannot be carried out accurately by methods less sophisticated than LES. The numerical scheme is predicated upon an implicit time-marching algorithm, and utilizes a high order compact finite-difference approximation to represent spatial derivatives. Robustness of the scheme is maintained by employing a low-pass Pade-type non-dispersive spatial filter, which also serves as an implicit sub-grid turbulent model. Geometrically complex applications are accommodated by a high order overset grid technique. Utility of the method is illustrated by steady and pulsed approaches to suppression of acoustic resonance in supersonic cavity flow, leading-edge vortex control of a delta wing, efficiency enhancement of a transitional highly loaded low-pressure turbine blade, and separation control of a wall-mounted hump model. Where available, comparisons are also made with experimental data.

Download or read book Effect of Forcing on the Vorticity Field in a Confined Wake written by Richard Keith Cohn and published by . This book was released on 1999 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental and Numerical Investigation of Transitional Plane wall Jet written by S. Gogineni and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Proceedings of the ASME Fluids Engineering Division Summer Conference 2006 Forums written by American Society of Mechanical Engineers. Fluids Engineering Division and published by . This book was released on 2006 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Investigation of Forced Transitional and Turbulent Wall Jets PHD written by Stefan Hermann Wernz and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the ASME Joint U S European Fluids Engineering Conference written by and published by . This book was released on 2006 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 43rd AIAA Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 2005 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 41st AIAA Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 2003 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Direct Numerical Simulation of a Plane Jet Using the Spectral compact Finite Difference Technique written by Randy Clarksean and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 03 3917 03 4041 written by and published by . This book was released on 2003 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AIAA Aerospace Sciences Meeting and Exhibit 42nd written by and published by . This book was released on 2004 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: