When two geometrically similar flow patterns, in perhaps different fluids with possibly different flow rates, have the same values for the relevant dimensionless numbers, they are said to be dynamically similar.
Kai du geometriškai panašūs srauto modeliai, o galbūt skirtingi skysčiai, su galimybe skirtingų srautų greičiu, turi tas pačias vertybes ir atitinkamus nedimensinius numerius, kurie dinamiškai panašūs.