Guillaume Polidori received his Ph.D. in fluid mechanics in 1994 from the University of Poitiers in France. He is a professor@the University of Reims, located in the Champagne region of France. Address: Laboratoire de Thermomécanique, GRESPI EA 4301, Faculté de Sciences de Reims, Moulin de la Housse, B.P. 1039, 51687 Reims Cedex 2, France. Internet: guillaume.polidori@univ-reims.fr