Citation:
Y. Shimada, B. Thornber and D. Drikakis. High-order implicit large eddy simulation of gaseous fuel injection and mixing of a bluff body burner. Computers and Fluids, Volume 44, Issue 1, May 2011, Pages 229-237
Abstract:
Implicit Large Eddy Simulation (ILES) with high-resolution and high-order
computational modelling was applied to a turbulent mixing fuel injector flow. In
the ILES calculation, the governing equations for three dimensional, non-
reactive, multi-species compressible flows were solved using a finite volume
Godunov-type method. Up to ninth-order spatial accurate reconstruction methods
were examined with a second order explicit Runge-Kutta time integration. Mean
and root mean square velocity and mixture fraction profiles showed good
agreement with experimental data, which demonstrated that ILES using high-order
methods successfully captured complex turbulent flow structure without using an
explicit subgrid scale model. The effects of grid resolution and the influence
of order of spatial accuracy on the resolution of the kinetic energy spectrum
were investigated. An k(-5/3) decay of energy could be seen in a certain range
and the cut-off wavenumbers increased with grid resolution or order of spatial
accuracy. The effective cut-off wavenumbers are shown to be larger than the
maximum wavenumbers appearing on the given grid for all test cases, implying
that the numerical dissipation represents sufficiently the energy transport
between resolved and unresolved eddies. The fifth-order limiter with a 0.6
million grid points was found to be optimal in terms of the resolution of
kinetic energy and reasonable computational time. (C) 2011 Elsevier Ltd. All
rights reserved.
