COYOTE: A computer program for 2-D reactive flow simulations
01 Apr 1990-
About: The article was published on 1990-04-01 and is currently open access. It has received 4 citations till now. The article focuses on the topics: Computer program & Flow (mathematics).
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TL;DR: The PRISM piecewise solution mapping procedure, in which the solution of the chemical kinetic ODE system is parameterized with quadratic polynomials, is applied to CFD simulations of H{sub 2}+air combustion as discussed by the authors.
Abstract: The PRISM piecewise solution mapping procedure, in which the solution of the chemical kinetic ODE system is parameterized with quadratic polynomials, is applied to CFD simulations of H{sub 2}+air combustion. Initial cost of polynomial construction is expensive, but it is recouped as the polynomial is reused. We present two methods that help us to parameterize only in places that will ultimately have high reuse. We also implement non-orthogonal Gosset factorial designs, that reduce polynomial construction costs by a factor of two over previously used orthogonal factorial designs.
37 citations
TL;DR: In this article, the Grassberger-Procaccaccaccia cumulative distribution method was used to measure the dimensionality of a 2D premixed hydrogen flame with a localized region of turbulence superimposed over the cold region upstream of the flame front.
Abstract: The dimensionality (D) of manifolds of active chemical composition space has been measured using three different approaches: the Hausdorff geometrical binning method, Principal Component Analysis, and the Grassberger-Procaccia cumulative distribution method. A series of artificial manifolds is also generated using a Monte Carlo approach to discern the advantages and limitations of the three methods. Dimensionality is quantified for different levels of turbulent intensity in a simulation of the interactions of a 2D premixed hydrogen flame with a localized region of turbulence superimposed over the cold region upstream of the flame front. The simulations are conducted using an adaptive mesh refinement code for low Mach number reacting flows. By treating the N{sub s} species and temperature of the local thermo-chemical state as a point in multi-dimensional chemical composition space, a snapshot of a flame region is mapped into chemical composition space to generate the manifold associated with the 2-D flame system. An increase in D was observed with increasing turbulent intensity for all three methods. Although each method provides useful information, the Grassberger-Procaccia method is subject to fewer artifacts than the other two thereby providing the most reliable quantification of D.
3 citations
TL;DR: In this paper, a cylindrical laminar jet of helium doped with biacetyl is injected into air and subjected to a weak shock wave, and a planar cross section of the jet is compared to planar laser-induced fluorescence images produced by the experiment.
Abstract: We present direct numerical simulations of a shock tube experiment in which a cylindrical laminar jet of helium doped with biacetyl is injected into air and subjected to a weak shock wave. Computed species distributions in a planar cross section of the jet are compared to planar laser-induced fluorescence images produced by the experiment. Given the qualitative nature of the published experimental images, the agreement with spatial flow features is quite good. We find that differential diffusion of species is an important feature of this experiment, leading to a significant decoupling of the helium and the biacetyl tracer.
01 May 1996
TL;DR: In this paper, it was shown that the radial motion of a wall jet is driven by vorticity generation in the wall boundary layer and at the corner of the piston crown.
Abstract: Numerical simulations and experiments of the jetting of gases from the ring crevices of a laboratory engine shortly after exhaust valve opening showed an unanticipated radial flow of the crevice gases into the main combustion chamber. We report well-resolved numerical simulations of a wall jet that show that this radial motion is driven by vorticity generation in the wall boundary layer and at the corner of the piston crown.