This chapter explains the fundamental concepts of similarity and points out the difficulties that arise if only partial dynamic similarity is possible. It focuses on the concepts of geometric, kinematic, and dynamic similarity. The chapter explains Froude number, Reynolds number, and Euler number in the context of dynamic similarity. It analyses the limitations of similarity in ship model tests. The chapter discusses Froude's hypothesis and the ITTC form factor method. The necessity for geometric similarity is the most obvious. Kinematic similarity in fluid mechanics is often referred to as the similarity of streamline patterns. Dynamic similarity requires that forces in full and model scale have the same direction and the ratio of magnitudes full scale to model scale is constant. Enforcing dynamic similarity of both inertia and gravity forces makes the time scale dependent on the geometric scale.
Laws of Similitude
Fundamentals of Ship Hydrodynamics ; 332-344
2019-05-06
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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