Made BoundaryInfo::boundary_ids for _children_on_boundary

Author: fdkong

src/mesh/boundary_info.C

@@ -1237,29 +1237,38 @@ void BoundaryInfo::boundary_ids (const Elem * const elem,
   // Clear out any previous contents
   vec_to_fill.clear();
 
-  // Only level-0 elements store BCs.  If this is not a level-0
-  // element get its level-0 parent and infer the BCs.
-  const Elem * searched_elem = elem;
+  // Only level-0 elements store BCs if _children_on_boundary is off
+  // We want to check current element if _children_on_boundary is on
+  std::vector<const Elem *> searched_elems;
+  if (_children_on_boundary || elem->level() == 0)
+    searched_elems.push_back(elem);
+
   if (elem->level() != 0)
     {
       if (elem->neighbor_ptr(side) == nullptr)
-        searched_elem = elem->top_parent ();
+        searched_elems.push_back(elem->top_parent());
 #ifdef LIBMESH_ENABLE_AMR
       else
+      {
+        const Elem * searched_elem = elem;
         while (searched_elem->parent() != nullptr)
           {
             const Elem * parent = searched_elem->parent();
-            if (parent->is_child_on_side(parent->which_child_am_i(searched_elem), side) == false)
+            if (parent->is_child_on_side(parent->which_child_am_i(searched_elem), side) == false && !_children_on_boundary)
               return;
             searched_elem = parent;
           }
+        searched_elems.push_back(elem->top_parent());
+      }
 #endif
     }
 
+
   // Check each element in the range to see if its side matches the requested side.
-  for (const auto & pr : as_range(_boundary_side_id.equal_range(searched_elem)))
-    if (pr.second.first == side)
-      vec_to_fill.push_back(pr.second.second);
+  for (auto searched_elem: searched_elems)
+    for (const auto & pr : as_range(_boundary_side_id.equal_range(searched_elem)))
+      if (pr.second.first == side)
+        vec_to_fill.push_back(pr.second.second);
 }
 
 
@@ -1285,7 +1294,7 @@ void BoundaryInfo::raw_boundary_ids (const Elem * const elem,
   vec_to_fill.clear();
 
   // Only level-0 elements store BCs.
-  if (elem->parent())
+  if (elem->parent() && !_children_on_boundary)
     return;
 
   // Check each element in the range to see if its side matches the requested side.