Numerical simulation and experimental study on stack-gas dispersion emitted from different elevated point source in an urban environment

الملخص EN

The flow and dispersion of stack-gas emitted from different an elevated point source around flow obstacles in an urban environment have been investigated theoretically using computational fluid dynamics models (CFD) and experimentally in the diffusion wind tunnel under different condition of thermal stability using a tracer gas technique without buoyancy.

The flow and dispersion fields in the boundary layer in an urban environment were examined at different flow obstacle.

Gaseous pollutant is discharged in the simulated boundary layer over the flat area.

The CFD models used for the simulation were based on the steady-state Reynolds-Average Navier-Stoke equations (RANS) with κ-ε turbulence models; standard κ-ε and RNG κ-ε models.

The flow and dispersion data measured in the wind tunnel experiments were compared with the results of the CFD models in order to evaluate the prediction accuracy of the pollutant dispersion.

The results of the CFD models wind tunnel experiments showed good agreement with the results of the wind tunnel experiments.

The obtained results indicate that the turbulent velocity is reduced by the obstacles models, and the maximum dispersion appears around the wake region of the obstacles.

Moreover, these results are used to validate the corresponding Gaussian dispersion model prediction.