Presenter/Author Information

W. Sha

Keywords

cartesian coordinate, fully time implicit scheme, higher-order upwind convection scheme, finite volume method, steep topography, complex object, flow modelling

Start Date

1-7-2002 12:00 AM

Description

We intend to develop a dynamical core for a new atmospheric meso-scale numerical model, which is expected to suitably treat the steep topography and complex objects on the earth’s surface with a finer resolution. In this work, the finite volume method (FVM) in conjunction with the SIMPLER (Semi-Implicit Method for Pressure-Linked Equation Revised) algorithms is used for calculations of the unsteady, threedimensional, compressible Navier-Stokes equations on a staggered grid. Abandoning the customary terrainfollowing normalization, we choose the Cartesian coordinate in which the height is used as the vertical one. Blocking-off method is introduced to handle all of the steep topography and complex objects above the earth’s sea-mean level. For the spatial and temporal discretizations, higher-order upwind convection scheme is employed, and fully time implicit scheme is utilized. As a preliminary test, the model has been run on flows over a cube mounted on surface. Result of simulations is present, which shows the potential of our proposed approaches for the next-generation atmospheric meso-scale model development.

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Jul 1st, 12:00 AM

Development of a dynamical core for a new atmospheric meso-scale numerical model

We intend to develop a dynamical core for a new atmospheric meso-scale numerical model, which is expected to suitably treat the steep topography and complex objects on the earth’s surface with a finer resolution. In this work, the finite volume method (FVM) in conjunction with the SIMPLER (Semi-Implicit Method for Pressure-Linked Equation Revised) algorithms is used for calculations of the unsteady, threedimensional, compressible Navier-Stokes equations on a staggered grid. Abandoning the customary terrainfollowing normalization, we choose the Cartesian coordinate in which the height is used as the vertical one. Blocking-off method is introduced to handle all of the steep topography and complex objects above the earth’s sea-mean level. For the spatial and temporal discretizations, higher-order upwind convection scheme is employed, and fully time implicit scheme is utilized. As a preliminary test, the model has been run on flows over a cube mounted on surface. Result of simulations is present, which shows the potential of our proposed approaches for the next-generation atmospheric meso-scale model development.