For this reason, a variable mesh version of the SOLA code, SOLA-VM, was chosen as a basis for illustrating the VOF technique. An experimental version of this new code, SOLA-VOF, was first reported in Ref. [5]. Since that time, many improvements have been made and the basic technique has matured through applications to a wide class of problems. In a related development [11], McMaster and co-workers have recently combined the SOLA-SURF code with a different interface tracking technique based on a VOF-like concept [12].