# Effect of a two-dimensional obstacle on the dispersion of a heavier-than-air gas in an atmospheric boundary layer

## Abstract

The results of a combined numerical and experimental investigation of the effect of a two-dimensional obstacle on the dispersion of a heavier-than-air gas in an atmospheric boundary layer are presented. In the numerical analysis portion, the governing equations are developed and the numerical solution algorithm is discussed. In the experimental portion a rough well boundary layer, that simulated at atmospheric surface layer flow, was generated in a 21.3 m long wind tunnel having a cross-section of 1.18 m x 1.68 m at the test section. Profiles of the mean velocity and turbulent kinetic energy are presented for 10 longitudinal positions from 5 obstacle lengths upstream to 12 obstacle lengths downstream of the leading edge of the obstacle. Results of a numerical simulation of the wind tunnel measurements are given showing the effect of turbulence model changes on the numerical solution and its comparison with measurements. Concentration results are presented for numerical simulations of dispersion in an atmospheric flow at an obstacle Reynolds number of 3.36 x 10/sup 6/, showing the effect of gas density, injection source location, and turbulence model changes on the cloud formation.

- Authors:

- Publication Date:

- Research Org.:
- Lawrence Livermore National Lab., CA (USA)

- OSTI Identifier:
- 6301347

- Report Number(s):
- UCRL-53288

ON: DE82015994

- DOE Contract Number:
- W-7405-ENG-48

- Resource Type:
- Technical Report

- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Thesis. Submitted to the Univ. of California, Davis

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 54 ENVIRONMENTAL SCIENCES; GASES; DIFFUSION; BENCH-SCALE EXPERIMENTS; BOUNDARY LAYERS; DENSITY; EXPERIMENTAL DATA; GAS FLOW; MATHEMATICAL MODELS; NAVIER-STOKES EQUATIONS; NUMERICAL SOLUTION; TURBULENT FLOW; WIND TUNNELS; DATA; DIFFERENTIAL EQUATIONS; EQUATIONS; FLUID FLOW; FLUIDS; INFORMATION; LAYERS; NUMERICAL DATA; PARTIAL DIFFERENTIAL EQUATIONS; PHYSICAL PROPERTIES; TUNNELS; UNDERGROUND FACILITIES; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

### Citation Formats

```
Sutton, S B.
```*Effect of a two-dimensional obstacle on the dispersion of a heavier-than-air gas in an atmospheric boundary layer*. United States: N. p., 1982.
Web.

```
Sutton, S B.
```*Effect of a two-dimensional obstacle on the dispersion of a heavier-than-air gas in an atmospheric boundary layer*. United States.

```
Sutton, S B. Sat .
"Effect of a two-dimensional obstacle on the dispersion of a heavier-than-air gas in an atmospheric boundary layer". United States.
```

```
@article{osti_6301347,
```

title = {Effect of a two-dimensional obstacle on the dispersion of a heavier-than-air gas in an atmospheric boundary layer},

author = {Sutton, S B},

abstractNote = {The results of a combined numerical and experimental investigation of the effect of a two-dimensional obstacle on the dispersion of a heavier-than-air gas in an atmospheric boundary layer are presented. In the numerical analysis portion, the governing equations are developed and the numerical solution algorithm is discussed. In the experimental portion a rough well boundary layer, that simulated at atmospheric surface layer flow, was generated in a 21.3 m long wind tunnel having a cross-section of 1.18 m x 1.68 m at the test section. Profiles of the mean velocity and turbulent kinetic energy are presented for 10 longitudinal positions from 5 obstacle lengths upstream to 12 obstacle lengths downstream of the leading edge of the obstacle. Results of a numerical simulation of the wind tunnel measurements are given showing the effect of turbulence model changes on the numerical solution and its comparison with measurements. Concentration results are presented for numerical simulations of dispersion in an atmospheric flow at an obstacle Reynolds number of 3.36 x 10/sup 6/, showing the effect of gas density, injection source location, and turbulence model changes on the cloud formation.},

doi = {},

url = {https://www.osti.gov/biblio/6301347},
journal = {},

number = ,

volume = ,

place = {United States},

year = {1982},

month = {5}

}