Reactive CFD in Engines with a New Unstructured Parallel Solver
| Article in |
English
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| Authors |
ZOLVER M. (IFP (1))
KLAHR D. (IFP (1))
BOHBOT J. (IFP (1))
LAGET O. (IFP (1))
TORRES A. (IFP (1))
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| Abstract |
KIFP, an hexahedral unstructured parallel code is currently developed at IFP since two years. Some algorithms of the KIVA-II's version currently used at IFP (KMB) are implemented in KIFP. Due to the new unstructured formalism, others algorithms (finite volume on staggered grid, time splitting, SIMPLE loop, sub-cycled advection, turbulent and spray models, etc.) have to be modified. Some new ones, like the conditional temporal interpolation methodology for moving grids, the remapping algorithm for transfering quantities on different meshes during the computation, the Van Leer and Superbee' slope limiters for advective fluxes, Kay and Crawford's heat transfer model and ECFM gasoline combustion model have been added. Super-scalar machines being widely used and developed, KIFP has been optimised for running on this type of machine. Many computer platforms and compilers have been tested. Because of its low cost of implementation, the OPEN-MP standard paradigm is used to parallelize the code. A speed-up of 3 out of 4 processors is reached. KIFP is now able to well simulate 3D combustion in actual automotive engines: as an example, we show in this paper some computations of an helical port on a steady state bench, an intake/compression/combustion in a port fuel injection (PFI) spark ignited engine with a pent roof chamber and a compression/spray injection in a direct injection (DI) Diesel engine. Comparisons with experimental results for engine cases (rotation speed and swirl coefficient for the steady state simulation and mean pressure curves for unsteady ones) or with analytical results for academic test cases are done as much as possible. |
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