Replace ClosedLoopHeartPulmonary with individual blocks

Problem

We currently have a closed-loop block ClosedLoopHeartPulmonary that combines four heart chambers and valves with a pulmonary and coronary circulation. @menon-karthik mentioned that it might become unstable for certain parameter choices and not easily adaptable to the monolithic structure.

Solution

Have a test case using individual blocks for chambers, valves, and vessels that reproduces the behavior of ClosedLoopHeartPulmonary (that should be implemented already). It would be nice to also add some documentation and plots on this closed-loop model.

Additional context

A challenge might be the handling of valves. The ClosedLoopHeartPulmonary block has four "hard" valves that explicitly set flows to zero when closed. This behavior might be harder to replicate with individual valve blocks.

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines

Start by locating the existing ClosedLoopHeartPulmonary block and the individual chamber, valve, and vessel blocks in the codebase. Build a test case that compares the individual-block model with ClosedLoopHeartPulmonary, then add the requested documentation and plots while checking how valve closure is represented.