(1) Center for Atmospheric Physics, Science Applications International Corporation, Mclean, VA, 22102, U.S.A;(2) School of Computational Sciences, George Mason University, 4031 University Drive, MS 5B2, Fairfax, VA, 22030-444, U.S.A
Abstract:
This is the first paper in a two-part series on the implementation of Godunov-type schemes on unstructured grids for atmospheric
flow simulations. Construction of a high-resolution flow solver for the scalar transport equation is described in detail.
Higher-order accuracy in space is achieved via a MUSCL-type gradient reconstruction after van Leer and the monotonicity of solution is enforced by slope limiters. Accuracy
in time is maintained by implementing a multi-stage explicit Runge-Kutta time-marching algorithm. The scheme is conservative
and exhibits minimal numerical dispersion and diffusion. Five different benchmark test cases are simulated for the validation
of the numerical scheme.