1. Chair of Fluid Dynamics, Department of Mechanical Engineering, Technische Universität Darmstadt, Otto-Berndt-Strasse 2, 64287 Darmstadt, Germany
2. GSC CE, Technische Universität Darmstadt, Dolivostraße 15, 64293 Darmstadt, Germany
3. Abastumani Astrophysical Observatory, Ilia State University, Tbilisi 0160, Georgia
4. M. Nodia Institute of Geophysics, Tbilisi State University, Tbilisi 0128, Georgia
5. Chair of Fluid Mechanics, Universität Siegen, Paul-Bonatz-Str. 9-11, 57068 Siegen, Germany
6. Faculty of Exact and Natural Sciences, Tbilisi State University, Tbilisi 0128, Georgia