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mphglobal does not work when model has more than one solution/study?
Posted Dec 28, 2010, 4:13 a.m. EST RF & Microwave Engineering, Interfacing, Heat Transfer & Phase Change Version 4.1, Version 4.2 2 Replies
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mphglobal(model, 'emw.neff'')
However, if I add another study like thermal stress (ts) to calculate the refractive index profile and then use that to find the modes, I can no longer extract emw.neff.
One would think that something like this should work:
mphglobal(model,'solname','sol2', 'emw.neff')
however mphglobal does not want to take 'solname' as an argument. But, as I was writing this I found that this helps:
[sz,ndofs,list,name,type]=mphgetp(model,'solname','sol2')
and then use "list" to calculate neff with
neff=real(1j*list/(2*pi/lambda0));
Done!
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I am now doing it exactly like this.
I do not know why it is not possible to extract the global variable. And unfortunately the Comsol interface always adds a real around the neff, although it shows the complete complex neff in the selection dropdown menu for the modes.
All this is a bit discouraging and seems arbitrary. But at least with the way via Matlab and mphgetp it works. :-)
Best regards
Arian
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When I do a Mode Analysis (emw) in COMSOL with matlab I can extract the effective refractive index with
mphglobal(model, 'emw.neff'')
However, if I add another study like thermal stress (ts) to calculate the refractive index profile and then use that to find the modes, I can no longer extract emw.neff.
One would think that something like this should work:
mphglobal(model,'solname','sol2', 'emw.neff')
however mphglobal does not want to take 'solname' as an argument. But, as I was writing this I found that this helps:
[sz,ndofs,list,name,type]=mphgetp(model,'solname','sol2')
neff=real(1j*list/(2*pi/lambda0));
Done!
I try
mphglobal(model, 'emw.neff'')
and
[sz,ndofs,list,name,type]=mphgetp(model,'solname','sol2')
and then use "list" to calculate neff with neff=real(1j*list/(2*pi/Lambda)),
but, i wonder why the answer is different by using that two methods.
the Neff is not the same...
do you faced this?
by the way, im using comsol 4.2.
thank