Hello, I'm using Comsol Multiphysics for my master thesis to realize a breast model. Now I'm studying the effects of the gravity load on the breast tissues, but I have some problems to reproduce the same results which are reported in my reference (an article that I found in literature). I've created a hemisperical model of four concentric tissue layers with uniform thickness; then I chose my boundary condition, by imposing a fixed contraint on the chest wall. (the article says that "An additional boundary condition was assumed that no displacement occurs on the chest wall interface"). However, i didn't obtain the same results.
Could this be related to the boundary condition? Is there any difference between "fixed contraint" and "prescribed displacement (where I impose displacement equal to zero in all directions)?
Thanking you in advance, Maria