[Lorenzo210]

Hi everyone,


I am using COMSOL 6.1 to simulate a droplet evaporation.


Geometry:
- 2D axis symmetric domain, 90degrees circle domain with R= 60*R_droplet
- Droplet initialized with its R_droplet and theta0 contact angle.


Physics:
- Laminar two phase flow with moving mesh;

- Heat tranfer in fluids;
- Transport of concentrated species;
- Transport of diluited species;

- Mathematical ODE for various calculations.


Multiphysics:
- Nonisothermal flow
- Marangoni effect
-Reacting flow


Problem: I tried to apply the Marangoni effect to the liquid-gas interface, but I cannot select the interface, only wall boundaries can be selected.


I am a bit confused because I took an identical model written in COMSOL 5.6 (not sure about the version), and the Marangoni effect can be applied to the interface.


The 5.6 Marangoni effect gives a warning that "This feature is obsolete and will be removed in future versions." so for that reason I am trying to use the new Marangoni effect version.


Has anyone any clue why the newest version cannot select the liquid-gas interface? The tutorial and the COMSOL documentation (user guide and similar) have not helped.


I was able to run successfully the older model enabling and disabling the Marangoni Effect, so the only issue is with the newest version.


Many thanks.


Regards,
Lorenzo