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{ BOUNDARY_SPACING.PDE
This problem demonstrates the use of the MESH_SPACING parameter to
control mesh density along a boundary.
The boundary of the inner region is forced to a grid spacing of 0.02
}
title 'Cell Size Control'
variables u
definitions k = 1 u0 = 1-x^2-y^2 s = 2*3/4+5*2/4 b = 0.1 c = 0.02
equations U: div(K*grad(u)) +s = 0
boundaries Region 1 start(-1,-1) value(u)=u0 |
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line to (1,-1) to (1,1) to (-1,1) to close
Region 2
start(-b,-b)
mesh_spacing=c { command placed inside the boundary path }
line to (b,-b) to (b,b) to (-b,b) to close
plots
grid(x,y)
contour(u) on region 2
end
