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

Technical Report · Sat May 01 04:00:00 EDT 1982

OSTI ID:6301347

Sutton, S B

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.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6301347
• Report Number(s): UCRL-53288; ON: DE82015994
• Country of Publication: United States
• Language: English

Related Subjects

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