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In the Transient tab of a pump definition, there are several default selections available for Specific Speed. What is the source of the 4-quadrant characteristic curves behind these specific speeds?
The specific speeds 25, 94 and 145 (SI units) were derived from data published by Stepanoff (1957), as well as personal correspondance, in terms of relative Q and N along lines of constant head and torque throughout the entire operating range.
The other default specific speeds are from Thorley, A.R.D and A. Chaudry., "Pump Characteristics for Transient Flow Analysis", Department of Mechnical Engineering & Aeronautics, City University, London ECIV OHB