\name{setup.grid.2D} \alias{setup.grid.2D} \title{ Creates a Finite Difference Grid over a Two-Dimensional Rectangular Domain } \description{ Creates a finite difference grid over a rectangular two-dimensional model domain starting from two separate one-dimensional grids (as created by \code{\link{setup.grid.1D}}). } \usage{ setup.grid.2D(x.grid=NULL, y.grid=NULL) } \arguments{ \item{x.grid }{list containing the one-dimensional grid in the vertical direction - see \code{\link{setup.grid.1D}} for the structure of the list } \item{y.grid }{list containing the one-dimensional grid in the horizontal direction - see \code{\link{setup.grid.1D}} for the structure of the list } } \value{ a list of type \code{grid.2D} containing: \item{x.up }{position of the upstream interface in x-direction (i.e. if x is vertical, the upper boundary); one value } \item{x.down }{position of the downstream interface in x-direction (i.e. if x is vertical, the lower boundary); one value } \item{x.mid }{position of the middle of the grid cells in x-direction; vector of length \code{x.N} } \item{x.int }{position of the interfaces of the grid cells in x-direction; vector of length \code{x.N+1} } \item{dx }{distance between adjacent cell interfaces in x-direction (thickness of grid cells); vector of length \code{x.N} } \item{dx.aux }{auxiliary vector containing the distance between adjacent cell centers; at the upstream and downstream boundary calculated as (\code{x[1]-x.up}) and (\code{x.down-x[x.N]}) respectively; vector of length \code{x.N+1} } \item{x.N }{total number of grid cells in the x direction; one value } \item{y.left }{position of the upstream interface in y-direction (i.e. if y us the horizontal, the left boundary); one value } \item{y.right }{position of the downstream interface in y-direction (i.e. if y us the horizontal, the right boundary); one value } \item{y.mid }{position of the middle of the grid cells in y-direction; vector of length \code{y.N} } \item{y.int }{position of the interfaces of the grid cells in y-direction; vector of length \code{y.N+1} } \item{dy }{distance between adjacent cell interfaces in y-direction (thickness of grid cells); vector of length \code{y.N} } \item{dy.aux }{auxiliary vector containing the distance between adjacent cell centers; at the upstream and downstream boundary calculated as (\code{y[1]-y.up}) and (\code{y.down-y[y.N]}) respectively; vector of length \code{y.N+1} } \item{y.N }{total number of grid cells in the y direction; one value } } \author{ Filip Meysman , Karline Soetaert } \examples{ # test of the setup.grid.2D functionality x.grid <- setup.grid.1D(x.up=0,L=10,N=5) y.grid <- setup.grid.1D(x.up=0,L=20,N=10) (grid2D <- setup.grid.2D(x.grid,y.grid)) } \keyword{utilities}