Hello everyone!
Having still a lot to learn in COMSOL, recently I've been trying to build the following setting: a transformer (consisting of a three-column laminated steel core with the windings fixed and coaxial to the central column, pretty similar to the e-core example) fully inmersed in oil inside a small-sized tank, in order to study the cooling/thermal behavior when it operates with an overload.
In a first approximation, MF (Magnetic Fields) and Conjugate Heat Transfer (HT + Fluid laminar flow) were the physics used in order to model the set up. The losses of the transformer (both in the core and the windings) were obtained via a no-load test and a short-circuit test and then introduced in the form of a volumetric heat source for the core domain and for both windings domain. There were no problems in the processing, when studying for a frequency-stationary state (50 Hz).
The problem is that now I'd like to go one step further and let COMSOL compute those losses and introduce them as the corresponding heat sources: this is where the multiphysics regarding joule and induction heating come into scene.
What I first did was introducing the induction heating multiphysics (coupling MF and HT) and select the core domain as the electromagnetic heat source but I don't know if I also should include the external contours of the core as a boundary electromagnetic heat source (when introducing the multiphysics, two types of sources come with it: boundary EM heat source and the EM heat source), what do you think?
And, of course, here is my dilemma: since the coupling of MF and HT doesn't allow me to select the joule heating multiphysics from the pull-down menu, should I also introduce EC physics into the model (If I use MFEC it also doesn't let me select joule heating) in order to do that (so I can select it)? or just by creating another pair of electromagnetic heat sources that I already have from the induction heating module and selecting the corresponding windings would work?
I'd really appreciate some help regarding my problem and I hope you guys understand my english.
Thanks in advance.
Having still a lot to learn in COMSOL, recently I've been trying to build the following setting: a transformer (consisting of a three-column laminated steel core with the windings fixed and coaxial to the central column, pretty similar to the e-core example) fully inmersed in oil inside a small-sized tank, in order to study the cooling/thermal behavior when it operates with an overload.
In a first approximation, MF (Magnetic Fields) and Conjugate Heat Transfer (HT + Fluid laminar flow) were the physics used in order to model the set up. The losses of the transformer (both in the core and the windings) were obtained via a no-load test and a short-circuit test and then introduced in the form of a volumetric heat source for the core domain and for both windings domain. There were no problems in the processing, when studying for a frequency-stationary state (50 Hz).
The problem is that now I'd like to go one step further and let COMSOL compute those losses and introduce them as the corresponding heat sources: this is where the multiphysics regarding joule and induction heating come into scene.
What I first did was introducing the induction heating multiphysics (coupling MF and HT) and select the core domain as the electromagnetic heat source but I don't know if I also should include the external contours of the core as a boundary electromagnetic heat source (when introducing the multiphysics, two types of sources come with it: boundary EM heat source and the EM heat source), what do you think?
And, of course, here is my dilemma: since the coupling of MF and HT doesn't allow me to select the joule heating multiphysics from the pull-down menu, should I also introduce EC physics into the model (If I use MFEC it also doesn't let me select joule heating) in order to do that (so I can select it)? or just by creating another pair of electromagnetic heat sources that I already have from the induction heating module and selecting the corresponding windings would work?
I'd really appreciate some help regarding my problem and I hope you guys understand my english.
Thanks in advance.