FEATool Multiphysics  v1.15.4 Finite Element Analysis Toolbox
ringgrid.m File Reference

## Description

RINGGRID Generate 2d grid of a ring.

[ GRID ] = RINGGRID( NR, NTH, RI, RO, XP, TH_START, TH_END ) Generates a quadrilateral grid for a ring shaped domain with NR cells in the radial and NTH cells in the tangential directions, respectively. RI and RO give the inner and outer radius, while the optional arguments XP, TH_START, and TH_END specify the center coordinates start, and end angles. Furthermore, the position of the radial layers can be manually specified through a vector of coordinates in NR (which overrides RI and RO).

Examples
  1) An annulus 64 cell grid for a circle with radius 1 and

outer radius 3 centered at [ 0.5, 0.5 ]
  grid = ringgrid( 10, 36, 1, 3, [0.5;0.5] );

2) An annulus with prescribed radial layers.

grid = ringgrid( [0.05 0.06 0.08 0.11 0.15], 32, [], [], [0;0], -3/4*pi );

3) Quarter ring.

grid = ringgrid( [0.05 0.06 0.08 0.11 0.15], 32, [], [], [0;0], 0, pi/2 );