Discussion Forum

Hi all,

I am designing complex microwave equipment and I need to create a computational way to recompute the new resonance frequency during the microwave heating study.

The material loss factor increases with the temperature, so as a consequence, the resonance frequency changes and I start to loose the efficiency of the microwave applicator.

I found that is not possible to have the emw and the mh models at the same COMSOL.

I was hopping that someone had a similar problem and has an automatic solution for this computation. Maybe using matlab link? The ideally process should be to check the resonance frequency in each time step of the microwave heating model.

I have two approaches for this problem, which unfortanely are manual:

- Compute the microwave heating model until a time instance that you know that you loose the resonance frequency, export the temperature field to a .txt and import in another file with a model emw with the same mesh, make a frequency domain study to recompute the resonance frequency. Go back to the file with the microwave heating model.

- The second approach is to make a second frequency-transient study in the microwave model from the last time instance of the first study (let's call it "t"). Use the parametric study option where the parameter is the frequency, after computation check the resonance frequency. Create a third study and start the computation with the new resonance frenquency.

The problem with these approaches is that it takes too much time and the user must make a lot of manual runs, to determinate when the resonance frequency is lost.

Any ideias?

Kind Regards,

Duarte Albuquerque