PPT-LES of Turbulent Flows

Lecture 8 ME EN 7960003 Prof Rob Stoll Department of Mechanical Engineering University of Utah Fall 2014 LES and numerical methods LES requires that the filtered equations of motion see Lectures 5 and 6 be solved on a numerical grid. Typically occurs when the velocity is low or the fluid is very viscous. 2 3Turbulent flow Opposite of laminar, where considerable mixing occurs, velocities are high. Laminar and Turbulent fl The purpose of this. 2 hour class is to give basic directions to undergraduate students to use . Phoenics. to simulate turbulent flows.. The lecture gives a brief introduction to turbulent flows features, to scales and to the law of the wall.. Andy Pon. Doug . Johnstone. Michael J. Kaufman. Paola . Caselli. F. rancesco . Fontani. Aina. Palau. Michael J. Butler. Izaskun. Jiménez-Serra. René Plume. Jonathan C. Tan. Felipe . Alves. Pau Frau. Alan Marscher. Institute for Astrophysical Research, Boston University. Research Web Page: . www.bu.edu/blazars. . Polarization varies erratically, as expected if it results from turbulence (or some disordering similar to turbulence). 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 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. Navier. -Stokes. Equations -- . RANS. 4 equations; 7 unknowns. Similar situation as when we went from Cauchy’s . eq. to N-S . eq. A. j. . = eddy viscosity. [m. 2. /s]. Turbulence Closure. Turbulent Kinetic Energy (TKE). EFD Final Project. Terrence Hess. Daniel Alexander. Mohammad Khan. Neil Lareau. 1. 21 Apr. 2011. Project Objectives . Characterize the diurnal evolution of turbulent statistics. for . two dissimilar 24 hour periods. 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. : Lecture. 7. (ME EN 7960-008). Prof.. Rob Stoll. Department of Mechanical Engineering. University of Utah. Spring 2011. Equations of Motion. . Incompressible flow:. . g. eneral scalar (. Sc. =Schmidt #). . Mark Rast. Laboratory for Atmospheric and Space Physics. Department of Astrophysical and Planetary Sciences. University of Colorado, . P. Balakumar . Flow Physics and Control . Branch. NASA Langley Research Center. Symposium on Advances in Turbulence Modeling. July 13, 2017. Ann Arbor. MI. Objectives. Perform DNS/LES to compute turbulent separated flows at high Reynolds numbers.. 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. (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.