Discussion Forum

Posted: 1 decade ago 25.03.2011, 08:34 GMT-4

Did you find the answer of your question? I have the same question as well. Please let me know if you acheived any information about optimization in a time dependent module. Thanks Atieh

Posted: 1 decade ago 05.05.2011, 06:40 GMT-4

I have the same difficulty!

Posted: 1 decade ago 05.05.2011, 07:37 GMT-4

yes. In time dependent cases I use comsol with matlab and write the inverse problem solver in matlab. ciao

Posted: 1 decade ago 05.05.2011, 09:21 GMT-4

Hi it can be done inside COMSOL too , there were a few eamples in 3.5, they must have been ported to v4, have a look -- Good luck Ivar

Posted: 1 decade ago 05.05.2011, 09:30 GMT-4

The same question. I want to do transient electromagnetic and heat transfer study in Comsol. There is one sample on microwave heating. I tried to follow that example to build my own, however it doesn't work. I can only get the stationary electric field result but there is no result on heat transfer. Did any one have the same experience? How did you solve it? thanks

Posted: 1 decade ago 05.05.2011, 10:02 GMT-4

Hi I can suggest to ask yourself: how did you define the head source in the HT module as coming from the EM module ? -- Good luck Ivar

Posted: 1 decade ago 28.06.2011, 05:43 GMT-4

Hello, I have similar kind of problem. My problem is: The problem is time dependent. I am working using chemical engineering module. I have used a set of parameters. In my model, I am computing concentrations of different species in different domains. For the comparison purpose, I use the available experimental data. Given a certain range for the parameters, I want to compute the optimized parameters such that I get the best fit (at certain values of time) compared with the experimental data. I have no idea how can I do it comsol or use matlab in it. So, I have to start from scratch. Can any one please guide me or share your model, so that using the same idea, I may implement it in my problem. I will be really thankful to you. Best Regards Qasim

Posted: 1 decade ago 28.06.2011, 06:52 GMT-4

Hi, I think you should convert your comsol case into a matlab .m file, and implement an iterative method at each time step, for ex. conjugate gradent method, to fit the time-dependent experimental data. This procedure is quite simple if experimental data can be represented by an analytic function of time. Actually I don't know any solution to solve your problem within comsol environment. Best regards Luigi

Posted: 1 decade ago 28.06.2011, 08:22 GMT-4

[QUOTE] Hi, I think you should convert your comsol case into a matlab .m file, and implement an iterative method at each time step, for ex. conjugate gradent method, to fit the time-dependent experimental data. This procedure is quite simple if experimental data can be represented by an analytic function of time. Actually I don't know any solution to solve your problem within comsol environment. Best regards Luigi [/QUOTE] Dear Luigi, I am very thankful to you for your reply. I have created a very simple model in comsol 3.5a. Then saved as m file. Can you please help me, how to add optimization function in this m file. My task is to minimize the error between the experimental data and the modeling data obtained from the Integration function (I1=postint). I am attaching the model file, m file and data file. I will be extremely grateful to you for this kindness. Thanks

Posted: 1 decade ago 29.06.2011, 10:18 GMT-4

I'm sorry but it would take too much time for me. Anyway, I am sure you can do it by yourself. Regards

Posted: 1 decade ago 29.06.2011, 10:37 GMT-4

[QUOTE] I'm sorry but it would take too much time for me. Anyway, I am sure you can do it by yourself. Regards [/QUOTE] Hello, I understand but If you could give me some hints or refer me to any example, it will be really helpful. Any way thanks for your reply. Best Regards Qasim

Posted: 9 years ago 10.09.2015, 13:47 GMT-4

Did anyone get the answer? How to optimize a heat flux boundary within COMSOL environment?