<研究ノート>次元解析再考

Description on the dimensional analysis is found in any text book on hydraulics or fluid mechanics because of its importance for engineering application such as flow experiments using reduced models. However, assumptions and derivation process for the dimensional analysis are not fully discussed in the prevailing text books. In this article, it is shown that the only principle needed for it is the “Principle of objectivity of physical phenomena (POPP)”. It is also reconfirmed that the assumption needed to derive POPP is the well-accepted fact that two physical quantities is added or subtracted only when they have a same dimension.departmental bulletin pape