A Mass Conserving Wind Model Evaluation With Finite Element

University essay from Umeå universitet/Institutionen för fysik

Author: Daniel Eriksson; [2013]

Keywords: ;


This work describes a method of approximating a wind field for an

urban environment for the purpose of dispersion modelling. Instead of

using the classic Navier Stokes equation, a mass conserving wind model is

evaluated. The model uses an empirical diagnostic study to approximate

a stationary windfield that is forced to be convergence free using a least

square variational technique. This work has shown that there is a way to

approximate the mass conserving wind field for a large urban environment

using Comsol Multiphysics and the Finite Element Method. Compared

to wind tunnel experiment the large features of the main flow are present

but the wind speed is underestimated. Among the iterative solvers tested

Multi grid and Conjugate Gradient performed best. An urban city with

2 100 000 degrees of freedom had a solution time of around three minutes.

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