- расширять диапазон применимости
- Расширять диапазон применимости
The suggestion that the range of applicability of the Navier-Stokes equation can be extended somewhat by the retention of slip boundary conditions was initiated by S. [...].In order to extend the range of validity of the Reynolds equation to the transition [flow], B. [...] introduced the commonly used first approximation of slip at the wall.
Русско-английский научно-технический словарь переводчика. 2013.