Discussion Forum

You said that the heat generated "doesn't change." Do you mean that you obtained exactly the same result as for a rectangular oven, to several digits of precision? Or... do you mean that the potato didn't heat up at all? If the former, is there any chance that you are actually looking at the results from the earlier solution? Bear in mind that depending on what you did when preparing your modified geometry, executing the solution, and then selecting your dataset to be plotted or tabulated, the old solution could still be stored/available in your model. But if the latter, there could be all sort of reasons for why the potato didn't heat up. Either way, perhaps you should post your model file to the forum.

Yes, heat on a potato is not similar to a rectangular oven. what parameters can be modified so that the heat on the potatoes can increase?

I'm confused. Should I interpret your new question to mean that: (1) you have already figured out what was wrong with your original model and are no longer interested in discussing that, and (2) you are now seeking advice from the forum about how to design/shape a microwave cavity to more effectively heat a potato?

I'm sorry about that, maybe what I'm asking isn't clear. In rectangular microwave oven the heat of potato can increase significantly. But, in octagonal microwave oven the heat of potato can not increase significantly. The simulation time is the same. I don't know what step i missed, because I following the tutorial microwave oven from comsol. Thank you very much.

Well, based only on the pictures you provided, you seem to be generating stronger fields (at least for the snapshot of the z-component of E that you plotted; a normE plot would have been more informative) in the vicinity of the potato, for the case of the rectangular oven. Stronger fields in/on the potato would be consistent with more rapid heating. What reason, if any, did you have to suppose that using an octagonal cross section (along with any other geometric or other changes that you might have made in your model, but which one can't tell from the pictures), would be beneficial? Do you have some literature, perhaps, that suggests octagonal-cylindrical ovens should work better? And your feed system appears to have changed also.