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On recontamination and directional-bias problems in monte carlo simulation of pdf turbulence models
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hsu, Andrew T. |
| Copyright Year | 1991 |
| Description | Turbulent combustion can not be simulated adequately by conventional moment closure turbulence models. The difficulty lies in the fact that the reaction rate is in general an exponential function of the temperature, and the higher order correlations in the conventional moment closure models of the chemical source term can not be neglected, making the applications of such models impractical. The probability density function (pdf) method offers an attractive alternative: in a pdf model, the chemical source terms are closed and do not require additional models. A grid dependent Monte Carlo scheme was studied, since it is a logical alternative, wherein the number of computer operations increases only linearly with the increase of number of independent variables, as compared to the exponential increase in a conventional finite difference scheme. A new algorithm was devised that satisfies a restriction in the case of pure diffusion or uniform flow problems. Although for nonuniform flows absolute conservation seems impossible, the present scheme has reduced the error considerably. |
| File Size | 147518 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920014103 |
| Archival Resource Key | ark:/13960/t75t8jf9c |
| Language | English |
| Publisher Date | 1991-10-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Nonuniform Flow Turbulence Exponential Functions Combustion Monte Carlo Method Probability Density Functions Algorithms Difference Equations Finite Difference Theory Turbulence Models Reaction Kinetics Uniform Flow Computational Grids Diffusion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
