... simulation (LES). High resolution is guaranteed by carefully fulfilling the requisites of y + < 1 , Δ x + < 100 , and Δ z + < 40 to resolve at least 80% of the turbulent kinetic energy. The result indicates that the cavity in growth is always undeveloped as the ambient hydrostatic pressure keeps...

...Jonathan K. Lai; Elia Merzari; Yassin A. Hassan Large eddy simulation (LES) is conducted for the flow over the shell side of a helical coil steam generator (HCSG) heat exchanger. Simulations are conducted on a simplified experimental test section that represents a one-column region of the helical...

... Dynamics Around the Clark-Y Hydrofoil With the FBDCM and an Integral Method ,” Ocean Eng. , 137 , pp. 247 – 261 . 10.1016/j.oceaneng.2017.03.054 [13] Rodi , W. , 1997 , “ Comparison of LES and RANS Calculations of the Flow Around Bluff Bodies ,” J. Wind Eng. Ind. Aerodyn. , 69–71 , pp. 55...

... LUIDS E NGINEERING . Manuscript received September 7, 2017; final manuscript received June 1, 2018; published online June 29, 2018. Assoc. Editor: Bart van Esch. 07 09 2017 01 06 2018 Cavitation Jets LES Multiphase flows Vortices Two-stage electrohydraulic servovalves...

...Solkeun Jee; Jongwook Joo; Ray-Sing Lin An efficient large-eddy simulation (LES) approach is investigated for laminar-to-turbulent transition in boundary layers. This approach incorporates the boundary-layer stability theory. Primary instability and subharmonic perturbations determined...

...Puxuan Li; Steve J. Eckels; Garrett W. Mann; Ning Zhang The setup of inlet conditions for a large eddy simulation (LES) is a complex and important problem. Normally, there are two methods to generate the inlet conditions for LES, i.e., synthesized turbulence methods and precursor simulation methods...

... in the channel. Reynolds-averaged Navier–Stokes (RANS) equations and large eddy simulation (LES) results revealed changes in vortex topology, with the flow regime changing from laminar to turbulent. During the turbulent flow regime in the recirculation zone, periodically recurring vortex systems are formed...

...Paul Ziadé; Mark A. Feero; Philippe Lavoie; Pierre E. Sullivan The shear layer development for a NACA 0025 airfoil at a low Reynolds number was investigated experimentally and numerically using large eddy simulation (LES). Two angles of attack (AOAs) were considered: 5 deg and 12 deg. Experiments...

... for the cambered airfoil accompanied by a slight delay in its shedding. Under poststall conditions, both airfoils behaved almost identically with successive generation and shedding of LEVs and TEVs that led to a rapidly varying distribution of aerodynamic forces at high angles of attack. The LES-predicted...

... are examined to ensure the consistency of the results. Furthermore, large eddy simulation (LES) analyses are performed to contrast the behavior in a well-established turbulent to a transitional flow regime. The results reveal a distinctive common flow pattern change (from an “open separation” to a “reattached...

... to Mr. Karkhanis for assistance in preparing the figures. • Los Alamos National Laboratory (Grant No. DE-AC52-06NA2-5396). Compressible flows Computational fluid dynamics Fluid instability LES Turbulence The implosion phase in inertial confinement fusion (ICF) [ 1 ] can...

... thermonuclear fusion: (1) these instabilities lead to the growth of perturbations on the interfaces within the capsules; (2) the perturbations become nonlinear, transition to turbulence, enhancing material mixing; and (3) material mixing inhibits thermonuclear burning of the fuel. Compressible flows LES...

...Nicholas Gibbons; Rolf Gehre; Stefan Brieschenk; Vincent Wheatley A laser ignition system suitable for a hypersonic scramjet engine is considered. Wall-modeled large eddy simulation (LES) is used to study a scramjet-like geometry with a single hydrogen injector on the inlet, at a Mach 8 flight...

... October 27, 2017. Assoc. Editor: Riccardo Mereu. 14 03 2017 13 09 2017 Acoustics Free surface flows LES Turbulence Vortices Antilock braking systems (ABSs) are used to improve the safety of vehicles by preventing tires from skidding as a result of the brakes locking up...

...Site Hu; Chao Zhou; Zhenhua Xia; Shiyi Chen This study investigates the aerodynamic performance of a low-pressure turbine, namely the T106C, by large eddy simulation (LES) and coarse grid direct numerical simulation (CDNS) at a Reynolds number of 100,000. Existing experimental data were used...

...Eduard Ron; Kam Chana This paper expands on the numerical simulation of entropy noise by performing a comparison of two commonly used models for resolving turbulent flow field: large eddy simulation (LES) and unsteady Reynolds-averaged Navier–Stokes (URANS). A brand new numerical procedure...

... in the experiment involves three stages, namely, cavity growth, shedding, and collapse. Numerical methods adopt large eddy simulation (LES) with Cartesian cut-cell mesh. Given that the speed of the model changes during the experiment, this paper examines cases with varying constant speeds. The free surface effects...

... 03 2017 Compressible flows Fluid instability LES Shocks Turbulence Turbulent mixing zones (TMZ) may appear at interfaces between different materials when the latter are subject to interfacial instabilities strong enough to trigger the transition to turbulence. For instance...

... of the vortex rope. Namely, the precession motion of the vortex rope generates a number of longitudinal vortices at its periphery, which trap particles and move them into the region of the upward swirl. 15 06 2016 12 03 2017 Gas-solid LES Particle flows Since being invented by John M...

... ] and in simulations [ 27 – 33 ]. The literature is extensive and covers various types of interfaces as well as different methods to create the necessary shock wave. The simulations utilize various numerical schemes include large eddy simulations (LES) and direct numerical simulations (DNS). Within both methods...