77 lines
2.6 KiB
Matlab
77 lines
2.6 KiB
Matlab
function mesh = AddPML( mesh, numcells, CoordSystem )
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%mesh = AddPML( mesh, numcells, <CoordSystem> )
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%
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% Adds equidistant cells to the specified directions of the simulation
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% area. This is used to put a PML (perfectly matched layer) absorber there.
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% Remember: this function only adds space for the PML, the boundary
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% conditions need to be set correctly to really add PML material.
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%
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% The mesh is sorted and duplicate lines are removed.
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%
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% input:
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% mesh: mesh structure
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% .x: 1xn vector (lines in x direction)
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% .y: 1xn vector (lines in y direction)
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% .z: 1xn vector (lines in z direction)
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% numcells: 1x6 vector (xmin,xmax,ymin,ymax,zmin,zmax) with number of
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% cells to add to this direction
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%
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% output:
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% mesh: new mesh
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%
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% openEMS matlab interface
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% -----------------------
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% Sebastian Held <sebastian.held@uni-due.de>
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% See also DefineRectGrid
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% check
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error( nargchk(2,3,nargin) );
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numcells = reshape( numcells, 1, [] );
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if numel(numcells) ~= 6
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error( 'argument numcells needs to have exactly 6 elements' );
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end
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if (nargin<3)
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CoordSystem = 0;
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end
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dir_names = 'xyz';
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if (CoordSystem==1)
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dir_names = 'raz';
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end
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mesh.(dir_names(1)) = unique(sort(mesh.(dir_names(1))));
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mesh.(dir_names(2)) = unique(sort(mesh.(dir_names(2))));
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mesh.(dir_names(3)) = unique(sort(mesh.(dir_names(3))));
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% xmin
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delta = mesh.(dir_names(1))(2) - mesh.(dir_names(1))(1);
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start = mesh.(dir_names(1))(1) - numcells(1)*delta;
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mesh.(dir_names(1)) = [start:delta:(mesh.(dir_names(1))(1)-delta), mesh.(dir_names(1))];
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% xmax
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delta = mesh.(dir_names(1))(end) - mesh.(dir_names(1))(end-1);
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stop = mesh.(dir_names(1))(end) + numcells(2)*delta;
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mesh.(dir_names(1)) = [mesh.(dir_names(1)), (mesh.(dir_names(1))(end)+delta):delta:stop];
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% ymin
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delta = mesh.(dir_names(2))(2) - mesh.(dir_names(2))(1);
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start = mesh.(dir_names(2))(1) - numcells(3)*delta;
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mesh.(dir_names(2)) = [start:delta:(mesh.(dir_names(2))(1)-delta), mesh.(dir_names(2))];
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% ymax
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delta = mesh.(dir_names(2))(end) - mesh.(dir_names(2))(end-1);
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stop = mesh.(dir_names(2))(end) + numcells(4)*delta;
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mesh.(dir_names(2)) = [mesh.(dir_names(2)), (mesh.(dir_names(2))(end)+delta):delta:stop];
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% zmin
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delta = mesh.(dir_names(3))(2) - mesh.(dir_names(3))(1);
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start = mesh.(dir_names(3))(1) - numcells(5)*delta;
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mesh.(dir_names(3)) = [start:delta:(mesh.(dir_names(3))(1)-delta), mesh.(dir_names(3))];
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% zmax
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delta = mesh.(dir_names(3))(end) - mesh.(dir_names(3))(end-1);
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stop = mesh.(dir_names(3))(end) + numcells(6)*delta;
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mesh.(dir_names(3)) = [mesh.(dir_names(3)), (mesh.(dir_names(3))(end)+delta):delta:stop];
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