PPT-LES of Turbulent Flows: Lecture 2

ME EN 7960008 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 . 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 Divesting in turbulent times Achieving value in a buyer’s marketContentsForewordSurvey highlightsStrategyPreparationExecutionUnprecedented times for business10 Golden rulesHow Ernst & Young can 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.. : . Lecture 8. (ME EN 7960-003). 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.. : 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). 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). : Lecture 7. (ME EN 7960-003). Prof.. Rob Stoll. Department of Mechanical Engineering. University of Utah. Fall 2014. Turbulence modeling (alternative strategies). So far our discussion of turbulence modeling has centered around separating the flow into resolved and . 1. (ME EN 7960-. 003). Prof. Rob Stoll. Department of Mechanical Engineering. University of Utah. Fall 2014. 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, . (ME EN 7960-008). Prof. Rob Stoll. Department of Mechanical Engineering. University of Utah. Spring . 2011. Scale Separation. We discussed LES in a very generic way to this point:. Resolve only the largest energy containing scales. 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.