Discussion Forum

Hi,

I am trying to solve plasmonic heating with COMSOL using em and heat solvers in a multiphysic approach. My question is related to BC in heat solver. I have a simple case of gold nanoparticle on a glass substrate. If i use insulation BC at the outer domain of the simulation region which is a sphere the solution does not converge in steady state. In transient, the temparature goes on increasing with time. However, the temparture profile looks like as expected. Instead, if I use a temperature BC at the outer domain (temp BC is at same temp as the initial condition and its room temp), i get correct solution for the temperature both in steady and transient states as expected by the analytical solution. But in this case temperature profile around the nanoparticle looks strange in a sense that temp profile in more spread in glass instead of air. Although as per my understanding heat should should diffuse more easily in glass than air so the temperature build up should be less in glass and more in air around the nanoparticle. Can anyone please comment on this. Thank you!