Consider the importance of near-time calculations to experimenters operating a wind tunnel to generate and collect fluid dynamics data for subsequent analysis. Suppose we are testing a scale model of a Boeing 777 wing mounted in a subsonic wind tunnel to determine the effects a winglet has on laminar flow around the primary wing as alpha -- angle of attack -- varies. The wind tunnel software computes and displays Reynolds number -- a measure as laminar flow becomes turbulent -- alongside alpha to guide operations in near-time to maximize use of resources; perhaps by restricting angle of attack past a selected turbulence measure or inhibiting full-scale data collection when turbulence exceeds the flight envelope (operational limits) of an actual 777. https://en.wikipedia.org/wiki/Reynolds_number . See also "The Wind Tunnels of NASA" and NASA ARC Standardized Wind Tunnel System (SWTS). The system programmer not only provides real-time data collection but near-time data sampling and computation of vital measurements such as Reynolds number while the experiment runs. The wind tunnel software system computes selected values as quickly and error free as possible in order to provide the best data during run time for later (super)-computation. The software engineer recognizes some computations are time critical for operational reasons. Later fluid dynamics computations could be time sensitive due to cost and super-computer time sharing.