4 Study method a Classical macroscopic study method macroscopic phenomenology method Phenomenon→ Abstract→ Mathematical description(mould)= Solution (Analysis Numerical, Experimental) a Building mould Mass, momentum or energy conservation law plus the mass, fluid viscous or heat conductive basic law = differential equation4 Study method „ Classical macroscopic study method (macroscopic phenomenology Method) „ Phenomenon ⇒ Abstract ⇒ Mathematical description(mould) ⇒ Solution (Analysis, Numerical, Experimental) „ Building mould Mass, momentum or energy conservation law plus the mass,fluid viscous or heat conductive basic law ⇒differential equation