High Quality Content by WIKIPEDIA articles! In geometry, the Weaire Phelan structure is a complex 3-dimensional structure. IN 1993, Denis Weaire and Robert Phelan, two physicists based at Trinity College Dublin found that in computer simulations of foam, this structure was a better solution of the "Kelvin problem" than the previous best-known solution, the Kelvin structure. IN 1887, Lord Kelvin asked how space could be partitioned into cells of equal volume with the least area of surface between them, i.E., what was the most efficient soap bubble foam? This problem has since been referred to as the Kelvin problem.