FAST3D-CT validation results using MUST field and wind tunnel data

Validation efforts of FAST3D-CT using the Mock Urban Setting Test (MUST) field data as well as MUST wind tunnel model data are presented. This paper is intended to follow a paper on MUST wind tunnel modeling by Leitl et al. FAST3D-CT is a three-dimensional, time dependent, building resolving, computational fluid dynamics transport and dispersion model that solves the high Reynolds number Navier-Stokes equations using a monotone integrated large eddy simulation formulation with stochastic backscatter. The full sized MUST array was simulated using a half meter grid resolution. Special attention was given to the upstream boundary layer profile and turbulence characteristics. Vertical wind field profiles at both the upstream and within the container array are compared using average, RMS, and spectral characteristics. Concentration average, standard deviation, and distributions are used to compare tracer transport and dispersion for both the field and wind tunnel data and presently show agreement. Wind field and concentration comparisons indicate agreement between the FAST3D-CT simulations and both the MUST field (Figure 1) and wind tunnel data.

Figure 1: Comparison of computational and MUST field average (panel a) and standard deviation (panel b) concentrations for line 1 of the MUST release 2692157

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John Iselin 2005-08-10