Development of a building wake/stack height numerical modeling capability
We are developing state-of-the-art numerical tools which can be used to provide reliable estimates of potential emissions at various LLNL sites. In particular we have focused our efforts in generating models which can simulate the wind flow and dispersion of airborne pollutants around surface-mounted structures such as buildings or building complexes. To achieve this goal, we have adopted two different but complementary approaches in the modeling of this complex problem. The first approach employs a Reynolds-averaged set of equations whose solution results in a description of the mean flow and concentration pattern. In the second approach, we are developing a more advanced model based on the large eddy simulation (LES) concept. In this report, we describe the progress in the development of the two approaches. We begin by discussing the calculational procedure which has been chosen for the Reynolds-averaged model, namely: prediction of the mean flow via a turbulent flow model, and; employment of the calculated flow field to drive a particle-in-cell transport and diffusion model (ADPIC). The performance of this model is benchmarked against experimental data obtained for flow over a backward-facing step. The backward-facing step problem can be viewed as a simplification of a rectangular-shaped surface mounted obstacle. We next include a brief description of the LES method, the continuum and discretized LES equations, the numerical methodology, and some preliminary flow calculations. As with the Reynolds-averaged model, the backward- facing step is used to benchmark the LES model development. The results are in agreement with the calculations of other researchers. We conclude by discussing several improvements which will be considered as we continue the development of both the Reynolds-averaged and the LES models. 40 refs., 15 figs., 1 tab.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5109726
- Report Number(s):
- UCRL-ID-108380; ON: DE92002117
- Country of Publication:
- United States
- Language:
- English
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A finite element/finite difference approach for modeling three- dimensional flow and pollutant dispersion around structures
A finite element/finite difference approach for modeling three-dimensional flow and pollutant dispersion around structures
Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
GASEOUS WASTES
ECOLOGICAL CONCENTRATION
TURBULENT FLOW
FLOW MODELS
A CODES
ATMOSPHERIC CIRCULATION
BOX MODELS
BUILDINGS
DIFFUSION
ENVIRONMENTAL TRANSPORT
F CODES
FLUID-STRUCTURE INTERACTIONS
PROGRESS REPORT
REYNOLDS NUMBER
STACK DISPOSAL
STACKS
THREE-DIMENSIONAL CALCULATIONS
TURBULENCE
VALIDATION
VORTICES
WIND
COMPUTER CODES
DOCUMENT TYPES
FLUID FLOW
MANAGEMENT
MASS TRANSFER
MATHEMATICAL MODELS
TESTING
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
540110*
990200 - Mathematics & Computers