Hi everyone! I have a problem with the mesh generation. Below there is attached a picture and as you can see, there is an area with mesh in between 2 blocks. I tried everything like merge vertices, check and delete the elements which are over there, but in the pre-processing it appears as a default boundary condition and it gives me an error when I want to run the simulation. I am wondering if there is any way to solve this to avoid making again the blocks from the entire domain. Thanks!