The speed of the Closeness diagnostic has speed up by up to 20 times compared to the 2015 release.
Cool solver has an additional requirement for surface meshes, the distance between the centroids of any two triangles should not be too small compared to the average edge length of the two triangles. This can happen when two sharp triangles are connected together. Closeness diagnostics finds this kind of problem.
The closeness diagnostic tool is located > .