// + 1 for numbering shift between GridGenerator and VF_GPU
// If splitDomain: remove all indices in fluidNodeIndicesBorder from fluidNodeIndices
// When splitDomain: push indices of fluid nodes in bulk to "fluidNodeIndices" and push indices of special fluid nodes (not in bulk) to fluidNodeIndicesBorder
if(splitDomain){
// When not splitDomain: push indices of all fluid nodes to "fluidNodeIndices"