PPT-LES of Turbulent Flows

Lecture 11 ME EN 7960003 Prof Rob Stoll Department of Mechanical Engineering University of Utah Fall 2014 Evolution of τ ij Deardorff ASME J Fluids Eng 1973 Deardorff. : Lecture 12. (ME EN 7960-008). Prof.. Rob Stoll. Department of Mechanical Engineering. University of Utah. Spring 2011. Turbulence modeling (alternative strategies). . Filtered Density Functions (FDF). : Lecture 5. (ME EN 7960-003). Prof.. Rob Stoll. Department of Mechanical Engineering. University of Utah. Fall 2014. The LES filter can be used to decompose the velocity field into resolved and subfilter scale (SFS) components. Yang . Chen. 1. , . K.H. . Luo. 1,2. 1. . Center. . for Combustion Energy, Tsinghua University, Beijing, China. 2. Department . of Mechanical Engineering, University College London, UK. 8th Trondheim Conference on CO2 Capture, Transport and Storage. Lecture 8. Turbulent Premixed Flames Turbulent premixed Flames Experimental setup: Low swirl burner Filtered Rayleigh Scattering setup Turbulent premixed Flames Results -simultaneousPIV / PLIF The com Andy Pon, . Doug . Johnstone. ,. Michael J. Kaufman. ApJ. , submitted May 2011 . Ridge et al. (2006). Observed. (FWHM = 1.9 km / . s. ). Thermal broadening alone. (FWHM = 0.2 km / . s. ). 12. CO J = 1-0. of a turbulent stably stratified air flow. above the wavy water surface.. . O. A. Druzhinin, Y. I. Troitskaya. . Institute of Applied Physics, RAS, Nizhny Novgorod, Russia. and. S.S. Zilitinkevich. LAMINAR FLOW . V.S. TURBULENT FLOW. This shows turbulence because it’s all over the place and rough. This part of the picture shows Laminar Flow because it runs very smoothly. (ME EN 7960-008). Prof. Rob Stoll. Department of Mechanical Engineering. University of Utah. Spring 2011. Vorticity: or. Turbulent Flow Properties. Why study turbulence? Most real flows in engineering applications are turbulent. . . Mark Rast. Laboratory for Atmospheric and Space Physics. Department of Astrophysical and Planetary Sciences. University of Colorado, . 1. Sandia . National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of  Sandia, LLC, a wholly owned subsidiary of Honeywell International,  Inc., for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-NA0003525.  SAND2017-6417C. DESCRIBE . the characteristics and flow velocity profiles of laminar flow and turbulent flow.. DEFINE . the property of viscosity.. DESCRIBE . how the viscosity of a fluid varies with temperature.. DESCRIBE . Gregory Falkovich. Weizmann Institute of Science. Rutgers, May 10, 2009. D. Bernard, A. Celani,. G. Boffetta, S. Musacchio. W. L. Physics Today . 59. (4), 43 (2006). Turbulence is a state of a physical system with many degrees of freedom deviated far from equilibrium. It is irregular both in time and in space.. Pete Strakey, NETL. Effects of pressure and diluents on flames.. Identification of target conditions.. Overview of characteristic time and length scales.. CFD simulations of turbulent time and length scales.. (ME EN 7960-003). Prof.. Rob Stoll. Department of Mechanical Engineering. University of Utah. Fall 2014. The LES filter can be used to decompose the velocity field into resolved and subfilter scale (SFS) components.