Los Alamos National Laboratory". Also, the convection calculations can be subcycled in the desired regions to avoid restricting the time step due to Courant conditions. A " kiva " is actually a round Pueblo ceremonial chamber that is set underground and entered from above by means of a ladder through its roof; drawing on LANL's southwestern heritage, an analogy is made with the typical engine cylinder in which the entrance and exit of gases is achieved through valves set in the cylinder. When the nation found itself in the midst of the first energy crisis in the s, this core Laboratory capability transformed into KIVA, an internal combustion engine modeling tool designed to help make automotive engines more fuel-efficient and cleaner-burning. In order to optimize combustion processes, engine designers have traditionally undertaken manual engine modifications, conducted testing, and analyzed the results.
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Also, the convection calculations can be subcycled in the desired regions to avoid restricting the time step due to Courant conditions.
Fuel economy is heavily dependent upon engine efficiencyv3 in turn depends to a large degree on how fuel is burned within the cylinders of the kiav. Archived from the original on October 21, Archived copy as title Webarchive template wayback links All articles with unsourced statements Articles with unsourced statements from August In order to optimize combustion processes, engine designers have traditionally undertaken manual engine modifications, conducted testing, and analyzed the results.
Cell-face boundary conditions permit greater flexibility and simplification in the application of boundary conditions. Unstructured grids can be generated more easily than structured grids for complex geometries.
Poorly controlled and incomplete combustion can cause higher levels of emissions and lower engine efficiencies.
The software predicts complex fuel and air flows as well as ignitioncombustionand pollutant-formation processes in engines. KIVA-3V uses a block-structured mesh with connectivity defined through indirect addressing. KIVA-4 also features a multicomponent fuel evaporation algorithm.
The departure from a single rectangular structure in logical space allows complex geometries to be modeled with significantly greater efficiency because large regions of deactivated cells are no longer necessary. Other applications have included the analysis of flows in automotive catalytic converterspower plant smokestack cleaning, pyrolytic treatment of biomassdesign of kivs suppression systemsPulsed Detonation Engines PDEsstationary burners, aerosol dispersion, and design of heating, ventilation, and air conditioning systems.
Archived from the original PDF on Archived from the original on In response to these problems, Los Alamos National Kivx scientists developed KIVA, an advanced computational fluid dynamics CFD modeling code that accurately simulates the in-cylinder processes of engines.
Fortran software Physics software Industrial software Computational fluid dynamics Finite element software for Linux.
KIVA (software) - Wikipedia
This iterative process is painstakingly slow, costly, and does not lend itself to identifying the optimal engine design specifications. Automatic restart of the cycle with a reduced timestep in case of iteration limit or temperature overflow effectively reduced code crashes. In addition, KIVA-4 loops over cell faces to compute diffusion terms. When the nation found itself in the midst of the first energy crisis in the s, this core Laboratory miva transformed into KIVA, an internal combustion engine modeling tool designed to help make automotive engines kjva fuel-efficient and kiv.
The unstructured grids may be composed of a variety of elements including hexahedraprismspyramidsand tetrahedra. KIVA-4mpi also solves chemically reacting, turbulent, multi-phase viscous flows, but does this on multiple computer processors with a distributed computational domain grid.
KIVA: Engine Research Center ~ UW-Madison
Retrieved October 24, Retrieved from " https: However, the numerical accuracy diminishes when the grid is not composed of hexahedra. Extensions to the particle-based liquid wall film model made the model more complete and a split kivq option was also added.
A stochastic particle method is used to calculate evaporating liquid sprays, including the effects of droplet collisions, agglomerationand aerodynamic breakups.
Los Alamos National Laboratory.
The code uses an Arbitrary Lagrangian Eulerian ALE methodology on a staggered gridand discretizes space using the finite volume method. A " kiva " is actually a round Pueblo 3b chamber that is set underground and entered from above by means of a ladder through its kia drawing on LANL's southwestern heritage, an analogy is made with the typical engine cylinder in which the entrance and exit of gases is achieved through valves set in the cylinder.
Views Read Edit View history. New features enhanced the robustness, efficiency, and usefulness of the overall program for engine modeling.
A new option provided automatic deactivation of a port region when it is closed from the cylinder and reactivation when it communicates with the cylinder. From Wikipedia, the free encyclopedia. The software is well suited for modeling internal kiav engines on multiple processors using the message passing interface MPI.
The code uses an implicit time-advancement with the exception of the advective terms that are cast in an explicit but second-order monotonicity -preserving manner.