external wave

external wave

[ek¦stərn·əl ′wāv]
(fluid mechanics)
A wave in fluid motion having its maximum amplitude at an external boundary such as a free surface.
Any surface wave on the free surface of a homogeneous incompressible fluid is an external wave.
References in periodicals archive ?
The critical contributions of Schelkunoff were to formulate transmission through a wall -- long before the Radiation Laboratory work -- and to recognize that near-field effects could be subsumed into the external wave impedance [Z.
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