Hi everyone,

In my model, a sphere comprises three layers, with the middle layer consisting of porous cohesive elements (red). In the simulation, I inject fluid at a specific rate into these porous elements. Initially, this process results in a rounded shape, as shown in Figure 1. However, when I change the material properties of the top layer (yellow elements) while keeping other settings and the cohesive zone material definition the same, the shape becomes deformed, as illustrated. Both materials for the yellow layer are Hyperelastic (Ogden model). Could this deformation be related to the cohesive zone's definition? Also, I noticed that the simulation with the original settings converges faster than the one with the altered material properties

Any other suggestion would be really appreciated, thank you.