Phongpat Isarakul. Numerical simulation of the shallow water equations with a new skipped grid. Master's Degree(Mathematics). King Mongkut's University of Technology Thonburi. KMUTT Library.. : King Mongkut's University of Technology Thonburi, 2007.
Numerical simulation of the shallow water equations with a new skipped grid
Abstract:
Two new skipped grids for the spherical coordinates are developed based on the concept of
equal-area grid. They are New Skipped Grid Method 1 and New Skipped Grid Method 2.
These methods avoid computational problems at the poles. In the New Skipped Grid
Method 1 the grid resolution is varied between 7,000 - 9,000 km". In the New Skipped Grid
Method 2, the grid resolution is fixed to 10,000 km". The Standard Test Case 1 for shallow
water equation JI?odel, advection of cosine bell over the pole, is used to compare the two
proposed methods with the non-skipped grid method. In the experiment cases, the shallow
water equations are solved with the fourth-order central difference. Results show that the
errors from the two skipped grid methods are less than the error from the non-skipped grid
method. For stability, Method 1 is better than the non-skipped grid method, and Method 2
is better than Method 1. Disadvantages of the new skipped grid methods are the location of
grid point depends on the predetermined resolution, and the programming for the new
skipped grid methods is more complex than that of the non-skipped grid method.