region = BoundaryRegions.X_CENTER + BoundaryRegions.Y_MAX;
neighbor = neighborMap.getBoundaryNeighbor(region);
identification = identificationString(
GeneralBoundaryType.Hardwall, myPartID, region, "boundary-edge");
if (myPart.ymax() != globalSimulation.ymax()) {
// If the region is not at the bottom of global simulation
// then it must have one neighbor
testForAnyNeighbor(neighbor, partitions.length, identification);
} else {