Hello everyone, I am using step-46 as starting point to implement a time dependent fsi problem using block vectors and block matrices. I successfully written the time iteration and changed everything to block structures but I am struggling to find a method to impose the fluid velocity equal to the displacement velocity at the interface (i.e. setting a fsi kinetic coupling). My approach is to use AffineConstraints::add_entry and AffineConstraints::set_inhomogeneity to write something like v=(u - u_old) / time_step, where u_old is the previous time step solution. The problem is to find the right column index j required by these class methods. Is there a way to find it? Thank you in advance
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