Hi,
"eps" is a reserved name in COMSOL that produces a number close to zero. As explained in the application documentation it is used here to avoid division by zero in during the iterations. We will add a clarifying text about the meaning of eps to the application doc for the next release.
"md" is the mass transfer rate between phases. It is only active if you add a Mass Transfer feature to the Mixture Model interface. You can read more about this the help section "Theory for the Mixture Model
Interfaces".
If you hit F1 while in COMSOL, the help panel appears. In the search field, type "weak form" and you will be directed to several sections in the user guide that will guide you. Please note that COMSOL cannot provide any support on applications with modified formulations in the equation view. Also, as a word of warning, the fluid flow interfaces have rather involved stabilization schemes that will probably be corrupted of you manually modify the equation view formulations. You run a big risk of getting unstable models or even wrong results.
"eps" is a reserved name in COMSOL that produces a number close to zero. As explained in the application documentation it is used here to avoid division by zero in during the iterations. We will add a clarifying text about the meaning of eps to the application doc for the next release.
"md" is the mass transfer rate between phases. It is only active if you add a Mass Transfer feature to the Mixture Model interface. You can read more about this the help section "Theory for the Mixture Model
Interfaces".
If you hit F1 while in COMSOL, the help panel appears. In the search field, type "weak form" and you will be directed to several sections in the user guide that will guide you. Please note that COMSOL cannot provide any support on applications with modified formulations in the equation view. Also, as a word of warning, the fluid flow interfaces have rather involved stabilization schemes that will probably be corrupted of you manually modify the equation view formulations. You run a big risk of getting unstable models or even wrong results.