“…Jones (1964), Price and Stallings (1967), Coleman and Lemmon (1973), Neumann and Hayes (1981) and Wang et al (1998). The most relevant experimental studies on surface protuberances to date are those performed by Hung and Clauss (1980) and Hung and Patel (1984), who studied the fully separated interaction induced by cylindrical and rectangular protuberances under both laminar and turbulent conditions. Based on their work, distinction can be made between tall (h>2Ø or h>2W), short (h<Ø or h<W) and wide protuberances (Ø or W , i.e.…”