Accession Number : ADA565228


Title :   Cyber-Based Turbulent Combustion Simulation


Descriptive Note : Final rept. 1 Mar 2008-20 Nov 2011


Corporate Author : WRIGHT STATE UNIV DAYTON OH DEPT OF MECHANICAL AND MATERIALS ENGINEERING


Personal Author(s) : Shang, Joseph J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a565228.pdf


Report Date : 28 Feb 2012


Pagination or Media Count : 10


Abstract : In an attempt to develop a viable option for complex turbulent combustion research, the flamelet concept is investigated by developing an interdisciplinary modeling and simulation capability via local grid refinement technique. The inherent deficiency at the grid block interface of the local polynomial refinement approach using the Gauss Quadrature formulation is remedied by a differential reconstruction scheme. The symmetry, coercivity, boundness, and adjoint consistency conditions of solutions at the grid block interface for combustion simulation are enforced for the diffusion dominant equation. A multiple-point, unequal spaced, differencing reconstruction approximation to preserve the spectral accurate and to increase computationally efficient is achieved and systematically validated by the L2 norm projection approach. The developed numerical scheme has been demonstrated to retain comparable spectral accuracy and is thrice more computationally efficient than the classic approach. The intrinsic behavior of the unique algorithm has successfully applied to the counter-flow, air-hydrogen combustion. The highly stretched flame that approaching the extinct limit is successfully simulated; the thin frame structure is captured by the developed numerical method with a greater clarity in resolving the detailed thermal layer of the flame front in a direct comparison with a benchmark of AFRL. The newly developed computational interdisciplinary simulation capability has been transferred to AFRL and applied to a path-finding application for combustion with radiative exchange in hypersonic scramjet.


Descriptors :   *COMBUSTION , *GRIDS , ALGORITHMS , COMPUTATION SCIENCE , COMPUTATIONAL FLUID DYNAMICS , REACTION KINETICS


Subject Categories : Operations Research
      Fluid Mechanics
      Air Breathing Engines(unconventional)
      Combustion and Ignition
      Jet and Gas Turbine Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE