1. Institue of Fluid Mechanics , University of Rostock, Albert-Einstein-Straße 2, Rostock 18059 , Germany
2. MAN Energy Solutions SE , Steinbrinkstraße 1, Oberhausen 46145 , Germany
3. Institute of Fluid Mechanics , University of Rostock, Albert-Einstein-Straße 2, Rostock 18059 , Germany