Centoird Offset Compute Broken

[danieljvickers]

Describe the bug
There is an all reduce sum in the centorid offset calculation that was missed before merging the local-aware ib patch refactor. This means that only ranks that see the IB will participate in the summation, and so some ranks block trying to sum while others never attempt to sum in the first place. This causes stalls.

To Reproduce
Steps to reproduce the behavior:

1. Place either an airfoil or STL IB on the side of a domain, far-left or far-right.
2. Run with enought ranks that some ranks will not see the IB in question

Expected behavior
We need to refactor this so that all IBs reduce the IB centroids correctly.

Environment

• All environments

Additional context
Add any other context about the problem here.

[danieljvickers]

As a note to anyone currently experiencing this issue. You can resolve it by increasing the ib_neighborhood_size case parameter to something large enough to encompass your entire computational domain.