title: TWODEE: the Health and Safety Laboratory's shallow layer model for heavy gas dispersion. Part 2: outline and validation of the computational scheme.
abstract: Part 1 of this three part paper described the mathematical and physical basis of TWODEE, the Health and Safety Laboratory's shallow layer model for heavy gas dispersion. In this part, the numerical solution method used to simulate the TWODEE mathematical model is developed. The boundary conditions for the leading edge, discussed in part 1, make demanding requirements on the computational scheme used. The flux correction scheme of Zalesak [S.T. Zalesak, Fully multidimensional flux-corrected transport algorithms for fluids, Journal of Computational Physics, 31 (1979) 335-362] is used in TWODEE as this has all the required properties. The TWODEE code is then tested against a number of theoretical and computational benchmark problems.
authors.affiliation: Health and Safety Laboratory, Harpur Hill, Buxton, Derbyshire SK17 9JN, UK.
authors.forename: R K
authors.initials: RK
authors.lastname: Hankin
authors.forename: R E
authors.initials: RE
authors.lastname: Britter
mesh_terms: D000465:Algorithms; D015982:Bias; D004058:Diffusion; D004735:Energy Transfer; D005740:Gases / Q000032:analysis / Q000493:pharmacokinetics*; D006112:Gravitation; D006801:Humans; D008958:Models, Molecular; D009716:Numerical Analysis, Computer-Assisted; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012212:Rheology
chemical_list: D005740:Gases