improve 3D-0D coupling initialization

[ncdorn]

Problem

Currently, initialization of pressures and flows at the boundaries coupled to svZeroDSolver applies a single value to all of the coupled surfaces. The user cannot provide specific pressure/flow initial values to individual surfaces.

Solution

allow the user to prescribe a specific initial pressure or flow at each coupled boundary individually.

Additional context

No response

Code of Conduct

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

[ncdorn]

@aabrown100-git has brought to my attention that you can initialize the individual coupling block values in the .json file. This may be sufficient behavior in this case, and we can remove initial values from the .xml file. I am curious to get people's thoughts on this