principle of dynamical similarity

principle of dynamical similarity

[¦prin·sə·pəl əv di¦nam·ə·kəl ‚sim·ə′lar·əd·ē]
(mechanics)
The principle that two physical systems which are geometrically and kinematically similar at a given instant, and physically similar in constitution, will retain this similarity at later corresponding instants if and only if the Froude number 1 for each independent type of force has identical values in the two systems. Also known as similarity principle.
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