grid

NAME

grid

SYNOPSIS

          grid nx dlt ntmax [-s ntstart]

DESCRIPTION

grid creates the computational domain for the fluid dynamics, $(\Omega_h)_{ij} = (x_{min} + ih,y_{min}+jh)$ with $i=1,2, \ldots, 2^{nx}$ and $j=1,2, \ldots, 2^{ny}$, and specifies time parameters. The quantity ny is computed so that the step size h = (x_max-x_min)/2^nx is the same in both directions. grid requires three arguments.

• nx - the number of grid points in the x direction is 2^nx
• dlt - the timestep
• ntmax - total timesteps to be taken

grid interpretes one optional argument.

• -s ntstart - ntstart * dlt is the initial time (default=0).

SEE ALSO

domain

EXAMPLE

          grid 7 0.000165 500

The computational grid contains 2⁷ = 128 nodes in the x direction. The time step is dlt =0.000165 and 500 time steps are to be taken.