1. Department of Mechanical Engineering, Ohio University, Athens, Ohio 45701–2979
2. Univ. Bordeaux, CNRS, Solvay, LOF, UMR 5258, F-33608 Pessac, France
3. PLACAMAT, UMS3626-CNRS/University of Bordeaux, Pessac, 33608, France
4. Laboratoire Navier, UMR 8205, Ecole des Ponts, IFSTTAR, CNRS, UPE, Champs-sur-Marne, France