Street Canyon Modeling

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Presentation transcript:

Street Canyon Modeling (using Dr. Nenes Model ) Paula Agudelo Carlos Hoyos 11/26/2003

The Idea H W Formulation of the problem geometry

The Model “Eddy diffusivity” Numerically solve the Navier-Stokes equations by using a finite volume descretization formulation. The k - epsilon model consists of the turbulent kinetic energy equation The codes are also capable of solving for turbulent flows: the standard two-parameter k-epsilon model can be used to estimate the Reynolds stresses. In the implementation of this model the Kolmogorov - Prandtl expression for the turbulent viscosity is used and the dissipation rate equation “Eddy diffusivity” http://nenes.eas.gatech.edu/CFD/index.html

Case 1

Laminar Case

Case 2

Case 2 (V=3m/s)

Laminar Case

Case 3

Case 4

Case 5

Case 6

Case 6 (source away from the building )

Scaling Under same atmospheric conditions building height becomes essential in the TKE generation!!

Dispersion depending on W/H ratio

Dispersion depending on Separation

Comparison with The microscale model MIMO,