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How to determine domain number from a given block name.
Posted 2 mag 2014, 10:26 GMT-4 RF & Microwave Engineering, LiveLink for MATLAB Version 4.4 5 Replies
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I'm currently working with a project where I have to prepare a model to be illuminated in the RF module by microwawes and ultimately being able to determine the location of tumors in human tissue.
This model requires, among many other things, that the model of the illuminated medium can be altered between to different types of materials, essentially flesh and something other than flesh, water is used so far for convenience. All of this model is intended to be controllede via the LiveLink interface to COMSOL and the illuminated medium is created using matlab commands, given a 10x10x10 grid of squares where it was my intend that the changes in medium could be done simply by selecting between to materials, using the command:
>> model.material('mat2').selection(*insert numbers here*);
but in order to do so, I need the domain numbers of a given block, and clicking them manually is not an option, as the full solution should be capable of handling in excess of 10000 block.
Each block has been created with code below, in order to ease identification:
%Array creation
for x=1:10;
for y = 1:1;
for z = 1:1;
CellSize = 5;
s = strcat('blk_x',num2str(x),'_y',num2str(y),'_z',num2str(z));
model.geom('geom1').feature.create(s, 'Block');
model.geom('geom1').feature(s).setIndex('size', num2str(CellSize), 0);
model.geom('geom1').feature(s).setIndex('size', num2str(CellSize), 1);
model.geom('geom1').feature(s).setIndex('size', num2str(CellSize), 2);
model.geom('geom1').feature(s).setIndex('pos', num2str(CellSize*x), 0);
model.geom('geom1').feature(s).setIndex('pos', num2str(CellSize*y), 1);
model.geom('geom1').feature(s).setIndex('pos', num2str(CellSize*z), 2);
end
end
end
The name string is for example 'blk_x10_y1_z1'
Have a nice weekend. -Thomas
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I have exactly the same problem. What I've used so far:
1. Rebuild geometry after addition of each block.
>> model.geom('geom1').run;
2. Get number of domains in geometry
>>blkDomainNumber = model.geom('geom1').getNDomains();
It should return the domain number of just added block.
But may be there is a better solution. If you find one, please let me know.
Thanks.
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yes it's inefficient and has a problem that domain numbers will be reassigned after you finalize geometry.
I've found another way to solve the problem:
activate auto creation of selections for each block (each grid block will create all possible selections)
>> blk.set('createselection', 'on');
after finalizing geometry
>> model.geom('geom1').run;
you can access to domain number for each block by selection name:
>> blkDomainSelectionEntities = model.selection('geomtag_blocktag_dom').entities(3);
where geomtag is your geometry tag (like geom1)
and block tag is you block tag.
See 'COMSOL API for use with Java Reference Manual' -> Selections of Geometric Entities -> Named selections
Hope this will help.
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I am using this technique in Matlab LiveLink, where the syntax is slighty altered:
"model.geom('geom1').feature('feature1').set('createselection','on');" -> Create selections automatically
"model.geom('geom1').run;" -> Run the geometry after finalizing it
"model.selection.tags;" -> Show all selection tags
"mphgetselection(model.selection('geom1_feature1_dom'))" -> Get selection
Cheers
Frank