Numerical simulations of industrial-scale combustion chamber - LES versus RANS

Numerical simulations of reverberation chamber

The focus of this project is to determine whether commercial general purpose raybased electromagnetic analysis tool (XGYD by Remcom, Inc.) can be an effective and accurate method of simulating a reverberation chamber and wireless communication within a confined and reflective environment, like a car. An introduction that includes the mathematical equations which govern the wireless channel is g...

Modeling unsteady turbulent flows over ripples: RANS versus LES

In-Chamber Analysis of Pollutants Formation in Diesel Combustion by Spectral Measurements and Numerical Simulations

Experimental difficulties in following the soot formation and oxidation processes in the environment of diesel engines are recognised in the high values of the in-chamber temperature and pressure and the presence of extremely reactive intermediate species. At present, optical techniques have overwhelmed lacks typical of both local in-cylinder and totalcylinder samplings, which allow a high temp...

Consistent boundary conditions for integrated LES/RANS simulations: LES outflow conditions

Numerical simulations of complex large-scale flow systems must capture a variety of physical phenomena in order to predict the flow accurately. Currently, many flow solvers are specialized to simulate one part of a flow system effectively, but are either inadequate or too expensive to be applied to a generic problem. As an example, the flow through a gas turbine can be considered. In the compre...

Realizable Uni ed RANS-LES and Dynamic LES Methods for Turbulent Flow Simulations

Existing LES methods face three basic problems: a huge variety of LES models are currently applied, dynamic LES methods are either very expensive or have to be combined with ow-dependent empirical stabilization techniques, and the cost of LES for wall-bounded ow simulations are way too high for most applications. Solutions for these three problems can be developed by deriving non-dynamic, dynam...