by MCAT Institute, National Aeronautics and Space Administration, National Technical Information Service, distributor in San Jose, CA, [Washington, D.C, Springfield, Va .
Written in English
|Other titles||Development of an upwind, finite volume code with finite-rate chemistry.|
|Statement||Gregory A. Molvik.|
|Series||NASA contractor report -- NASA CR-196749.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
Get this from a library! Development of an upwind, finite-volume code with finite-rate chemistry. [Gregory A Molvik; United States. National Aeronautics and Space Administration.]. Development of an upwind, finite-volume code with finite-rate chemistry. By Gregory A. Molvik. Both algorithms take advantage of the benefits of upwind differencing, total variation diminishing techniques and of a finite-volume framework, but obtain their solution in two separate manners. Author: Gregory A. Molvik. Both algorithms take advantage of the benefits of upwind differencing, total variation diminishing techniques, and a finite-volume framework, but obtain their solution in two separate manners. The first algorithm is a zonal, time-marching scheme, and is generally used to obtain solutions in the subsonic portions of the flow : Gregory A. Molvik. The two finite volume codes were run on the HPC-Midlands facility, whilst the LBM code was run on an industrial facility. In all cases computation was then in parallel using cores, with differences in processor speeds. HPC-Midlands processors were GHz Intel ‘Sandy Bridge’ whilst the industrial facility used GHz Intel ‘Xeon’ processors.
Two particular CFD codes are explored. The first is uFVM, a three-dimensional unstructured pressure-based finite volume academic CFD code, implemented within Matlab. The second is OpenFOAM®, an open source framework used in the development of a range of CFD programs for the simulation of industrial scale flow problems. The chemistry solver uses typical finite-rate reaction kinetics, with the forward rate coefficient given by the modified Arrhenius expression. The issue I'm having is that the reaction rates do not seem to be correct; there is way too much dissociation happening in high temperature regions. The underlying flow solver is an implicit, upwind finite volume scheme which can incorporate either a perfect gas or an equilibrium air equation of state. Two different approaches which yield identical results, in terms of performing a conservative flux calculation on a zonal interface, are described and compared in terms of numerical efficiency. Upwind differencing is a rather useless concept in that context (but I'm not an expert in the numerical treatment of wave equations). Similar arguments apply to the two-dimensional case. Additional reading.
Development of an Advection Upstream Splitting Method (AUSM +-up) scheme-based Unstructured Finite Volume (UFVM) solver for the simulation of two-dimensional axisymmetric/planar high speed compressible turbulent reacting shear layers is inviscid numerical flux is evaluated using AUSM +-up upwind eight-step hydrogen–oxygen finite rate chemistry model is used to . A finite-difference method based on conservative supra characteristic method type upwind flux difference splitting has been developed to study the equilibrium Study on hypersonic finite-rate chemically reacting flows using upwind method A TVD Finite-Volume Technique for Nonequilibrium Chemically Reacting Flows, AIAA Google. IRather than teach how to use a particular CFD code, the course aims to give an understanding of the approximations and numerical t reatments found in most general CFD codes. Review of Basic Finite Volume Methods /11 3 / 24 The Basic Finite Volume Method I One important feature of nite volume schemes is their conse rvation properties. The implementation of a finite volume upwind scheme to solve the 2D shallow water equations and the 1D shallow water equations as well as their coupling was presented in this work. The leading interest is the possibility to provide dynamic simulations of the interaction between free surface flow on the surface and drainage flow in urban systems.