1. Strasse 201, Nr. 6, D-13156 Berlin, Germany, Instituto Pluridisciplinar, Universidad Complutense, Paseo Juan XXIII n°1, E-28040 Madrid, Spain, International Center for Mechanical Sciences (CISM), Palazzo del Torso, Piazza Garibaldi, I-33100 Udine, Italy, Briese-Strasse 32 A, D-12053 Berlin, Germany, Waldstrasse 8, D-12527 Berlin, Germany, and LS Technische Mechanik und Strömungsmechanik, Universität Bayreuth, D-95440 Bayreuth, Germany