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comsol_extract_field.m
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function [Q lambda] = comsol_extract_field( filename,threshold, ...
num_modes,directory, ...
rangeString, R, geom_switch, ...
geom_element)
%% SOME PARTS OF SPA-SALT MOVED HERE FOR SPEED:
%% construct the cavity edge:
tmp = dlmread([directory, 'grid_xy']);
xpts = tmp(1,:);
ypts = tmp(2,:);
dx = abs(xpts(2) - xpts(1));
dy = abs(ypts(2) - ypts(1));
clear tmp;
cavityLocs = zeros(length(xpts),length(ypts));
switch geom_switch
case 'D'
r0 = geom_element * R;
for xii=1:length(xpts)
x = xpts(xii);
for yii=1:length(ypts)
y = ypts(yii);
if ( (x^2 + y^2 <= R^2) && (y <= r0) )
cavityLocs(xii,yii) = 1;
end
end
end
case 'Quad'
r0 = R/(1+geom_element);
for xii=1:length(xpts)
x = xpts(xii);
for yii=1:length(ypts)
y = ypts(yii);
theta = atan(y/x)+pi/2;
r = sqrt(x^2 + y^2);
if (r <= r0*(1+geom_element*cos(2*theta)))
cavityLocs(xii,yii) = 1;
end
end
end
case 'Ellipse'
aa = geom_element(1);
bb = geom_element(2);
for xii=1:length(xpts)
x = xpts(xii);
for yii=1:length(ypts)
y = ypts(yii);
if ( (x/bb)^2 + (y/aa)^2 <= 1)
cavityLocs(xii,yii) = 1;
end
end
end
case 'Stadium'
L = geom_element(1);
r0 = geom_element(2);
for xii=1:length(xpts)
x = xpts(xii);
for yii=1:length(ypts)
y = ypts(yii);
if ( (x<=r0)&&(x>=-r0)&&(y>=-L/2)&&(y<=L/2) )
cavityLocs(xii,yii) = 1;
elseif ( (x<=r0)&&(x>=-r0)&&(y>L/2) )
r = sqrt((y-L/2)^2 + x^2);
if (r<=r0)
cavityLocs(xii,yii) = 1;
end
elseif ( (x<=r0)&&(x>=-r0)&&(y<-L/2) )
r = sqrt((y+L/2)^2 + x^2);
if (r<=r0)
cavityLocs(xii,yii) = 1;
end
end
end
end
otherwise
error('I do not recognize your choice of geometry.');
end
%% BEGIN COMSOL:
%FCTNEXTRACTFIELD001 Summary of this function goes here
% Detailed explanation goes here
import com.comsol.model.*
import com.comsol.model.util.*
model = mphload([filename,'.mph']);
model.result.numerical.create('gev1', 'EvalGlobal');
model.result.numerical('gev1').set('descr', ' Frequency Frequency');
model.result.numerical('gev1').set('expr', 'freq');
model.result.table.create('tbl1', 'Table');
model.result.table('tbl1').comments('Global Evaluation 1 (freq)');
model.result.numerical('gev1').set('table', 'tbl1');
model.result.numerical('gev1').setResult;
model.result.table('tbl1').save(['scratcheigenwavelength','.txt']);
model.result.table.remove('tbl1');
model.result.numerical.remove('gev1');
system(['mv scratcheigenwavelength.txt ',directory]);
filename = [directory,'scratcheigenwavelength','.txt'];
A = dlmread(filename,'%',5,0);
C = 3e8;
Q = real(A(:,1))./imag(A(:,1))/2;
lambda = C./real(A(:,1));
figure(1);clf;
stem(lambda,Q);
dlmwrite([directory,'lambda_Q'],[lambda Q]);
parfor ii=1:num_modes
if(Q(ii)>threshold)
disp(Q(ii));
model.result.export.create('data1', 'Data');
model.result.export('data1').set('solnum', {num2str(ii)});
model.result.export('data1').set('expr', {'Ez'});
model.result.export('data1').set('descr', {'Electric field, z component'});
model.result.export('data1').set('filename',['Ez_sol',num2str(ii),'.mat']);
model.result.export('data1').set('location', 'grid');
model.result.export('data1').set('gridstruct', 'grid');
model.result.export('data1').set('gridx2', ['range(',rangeString,')']);
model.result.export('data1').set('gridy2', ['range(',rangeString,')']);
model.result.export('data1').run;
model.result.export.remove('data1');
system(['mv Ez_sol',num2str(ii),'.mat ',directory]);
% model.result.export.create('data1', 'Data');
% model.result.export('data1').set('solnum', {num2str(ii)});
% model.result.export('data1').set('expr', {'Ex'});
% model.result.export('data1').set('descr', {'Electric field, x component'});
% model.result.export('data1').set('filename', 'scratch_Ex');
% model.result.export('data1').set('location', 'grid');
% model.result.export('data1').set('gridstruct', 'grid');
% model.result.export('data1').set('gridx2', ['range(',rangeString,')']);
% model.result.export('data1').set('gridy2', ['range(',rangeString,')']);
% model.result.export('data1').run;
% model.result.export.remove('data1');
%
%
% model.result.export.create('data1', 'Data');
% model.result.export('data1').set('solnum', {num2str(ii)});
% model.result.export('data1').set('expr', {'Ey'});
% model.result.export('data1').set('descr', {'Electric field, y component'});
% model.result.export('data1').set('filename', 'scratch_Ey');
% model.result.export('data1').set('location', 'grid');
% model.result.export('data1').set('gridstruct', 'grid');
% model.result.export('data1').set('gridx2', ['range(',rangeString,')']);
% model.result.export('data1').set('gridy2', ['range(',rangeString,')']);
% model.result.export('data1').run;
% model.result.export.remove('data1');
Ez = dlmread([directory,'Ez_sol',num2str(ii),'.mat'],'%',12,0); % change 12 to 13 for comsol 5.2
% Ex = dlmread('scratch_Ex','%',12,0);
% Ey = dlmread('scratch_Ey','%',12,0);
%figure(1);clf;
%imagesc(abs(Ez));
Ez = Ez .* cavityLocs;
normFac = sum(reshape(Ez,[],1) .* reshape(Ez,[],1))*dx*dy;
Ez = Ez/sqrt(normFac);
parsave([directory,'Ez_sol',num2str(ii),'.mat'],Ez);
%dlmwrite([directory,'Ez_sol',num2str(ii),'.mat'],Ez);
end
end
model.result.export.create('data1', 'Data');
model.result.export('data1').set('solnum', '1');
model.result.export('data1').set('expr', {'emw.epsrAv'});
model.result.export('data1').set('descr', {'Relative permittivity, average'});
model.result.export('data1').set('filename',['scratch_structure']);
model.result.export('data1').set('location', 'grid');
model.result.export('data1').set('gridstruct', 'grid');
model.result.export('data1').set('gridx2', ['range(',rangeString,')']);
model.result.export('data1').set('gridy2', ['range(',rangeString,')']);
model.result.export('data1').run;
model.result.export.remove('data1');
structure = dlmread(['scratch_structure'],'%',12,0); % change 12 to 13 for comsol 5.2
dlmwrite([directory,'structure'],structure);
end
function [] = parsave(fname,Ez)
save(fname,'Ez');
end