Three-dimensional Model for Simulating Atmospheric Dispersion of Heavy-gases Over Complex Terrain PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
To help understand heavy gas releases and simulate the resultant dispersion, we have developed a three-dimensional finite element model called FEM3 and an improved version names FEM3A for solving the time dependent conservation equations based on generalized anelastic approximation. Recent enhancements to the model to include the treatment of dispersion scenarios involving density variations much larger than the liquefied natural gas range and an advanced turbulence submodel based on the buoyancy-extended transport equations. This paper presents the main features of the present model FEM3C and numerical results from the simulations of a field-scale LNG spill experiment.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
To help understand heavy gas releases and simulate the resultant dispersion, we have developed a three-dimensional finite element model called FEM3 and an improved version names FEM3A for solving the time dependent conservation equations based on generalized anelastic approximation. Recent enhancements to the model to include the treatment of dispersion scenarios involving density variations much larger than the liquefied natural gas range and an advanced turbulence submodel based on the buoyancy-extended transport equations. This paper presents the main features of the present model FEM3C and numerical results from the simulations of a field-scale LNG spill experiment.
Author: Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
The results of this study indicate that the current data assimilation technique can have a positive impact on the mesoscale flow fields; however, care must be taken in its application to grids of relatively fine horizontal resolution. Continuous FDDA is a useful tool in producing high-resolution mesoscale analysis fields that can be used to (1) create a better initial conditions for mesoscale atmospheric models and (2) drive transport models for dispersion studies. While RAMS is capable of predicting the qualitative flow during this evening, additional experiments need to be performed to improve the prognostic forecasts made by RAMS and refine the FDDA procedure so that the overall errors are reduced even further. Despite the fact that a great deal of computational time is necessary in executing RAMS and LPDM in the configuration employed in this study, recent advances in workstations is making applications such as this more practical. As the speed of these machines increase in the next few years, it will become feasible to employ prognostic, three-dimensional mesoscale/transport models to routinely predict atmospheric dispersion of pollutants, even to highly complex terrain. For example, the version of RAMS in this study could be run in a ''nowcasting'' model that would continually assimilate local and regional observations as soon as they become available. The atmospheric physics in the model would be used to determine the wind field where no observations are available. The three-dimensional flow fields could be used as dynamic initial conditions for a model forecast. The output from this type of modeling system will have to be compared to existing diagnostic, mass-consistent models to determine whether the wind field and dispersion forecasts are significantly improved.
Author: Publisher: ISBN: Category : Languages : en Pages : 51
Book Description
WADOCT (Wind and Diffusion Over Complex Terrain) is a complex terrain dispersion model capable of running on a microcomputer. It consists of two models-(1) AFWIND, a surface-layer windflow model, and (2) AFTOX, a Gaussian puff dispersion model. The terrain induced wind field and the dispersion pattern are computed separately and independently of each other. Through a transformation scheme the location and shape of the plume footprint is then adjusted to the computed wind field. An evaluation of the model is presented using data from the AMADEUS and the Mountain Iron dispersion experiments. The evaluation shows that the model tends to underpredict the adjustment to the wind direction and overpredict the length and width of the plume footprint.
Author: R. E. Britter Publisher: Elsevier Science & Technology ISBN: Category : Technology & Engineering Languages : en Pages : 264
Book Description
Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
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Author: Bruce A. Kunkel
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Author: Jerry A. Havens
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Author: Jerry A. Havens
Author: J. S. Puttock
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Author: R. E. Britter