PPT-LES of Turbulent Flows

Lecture 12 ME EN 7960008 Prof Rob Stoll Department of Mechanical Engineering University of Utah Spring 2011 Turbulence modeling alternative strategies Filtered Density Functions FDF. 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 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. : 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. 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 . 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. 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. . : 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, . (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. 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 . 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..