The spectral finite difference method with a highly spatial resolution and a fast computation speed is applied to simulate the numerical analysis of large-scale atmospheric diffusion phenomenon in smog. A two-dimensional domain as an analytic object i...
The spectral finite difference method with a highly spatial resolution and a fast computation speed is applied to simulate the numerical analysis of large-scale atmospheric diffusion phenomenon in smog. A two-dimensional domain as an analytic object is selected, and an analytic fluid is assumed to be laminar, incompressible and viscous. Heat flux and smog inflow are taken in a fixed section on an abscissa as a fire phenomenon. Two-dimensional Navier-Stokes equations with a buoyancy under Boussinesq assumption, continuity equation, energy equation and diffusion equation as governing equations are used. Using a conformal boundary-fitted coordinate system, numerical analyses are performed on various conditions. Dimensionless values of concentration, temperature and stream function increase with the Grashof number. Only dimensionless concentration increases with dimensionless diffusion coefficient, but dimensionless values of temperature and stream function are not changed with dimensionless diffusion coefficient. Except dimensionless values of stream function, concentration and temperature decrease with increasing the Reynolds number.