1. Selection of unit system physical constant The program applies a set of consistent units. The user is free to select any combination of unit names for: time \([\mathrm T]\) length \([\mathrm L]\) mass \([\mathrm M]\) force \([\mathrm F]\) 1.1. Data group identifier, one input line Mandatory. UNIT NAME SPECification 1.2. Unit names and gravitational constant Mandatory. UT UL UM UF GRAV GCONS UT: character(6), default: "s": Unit name for time UL: character(6), default: "m": Unit name for length UM: character(6), default: "kg": Unit name for mass UF: character(6), default: "kN": Unit name for force GRAV: real > 0, default: 9.81: Numerical value of gravitational constant \([\mathrm {L/T^2}]\) GCONS: real > 0, default: 0.001: Consistency acceleration parameter. GCONS = ACC[UF/UM]/ACC where ACC` is the numerical value of acceleration with the force and mass units, and with the length and time units, respectively. With a consistent set of units, GCONS = 1.0. Example: For the default units, the acceleration of gravity is \(9.81\times 10^{-3}\,\mathrm {kN/kg}\) or \(9.81\,\mathrm {m/s}^2\) and GCONS may be calculated as \(\mathrm {9.81\times 10^{-3}/9.81=0.001}\). In the case of GCONS \(\mathrm {\neq 1}\), the calculation of drag force coefficients must be multiplied by GCONS, for example CDY = GCONS\(\mathrm {(\frac{1}{2}\rho C_DD)}\), see also Hydrodynamic force coefficients. The unit names are printed as an output heading as shown below. +--------------------------------------------------------+ ! CONSISTENT UNITS USED THROUGHOUT THE ANALYSES ! !--------------------------------------------------------! ! NAME FOR TIME : T = s ! ! NAME FOR LENGTH : L = m ! ! NAME FOR MASS : M = kg ! ! NAME FOR FORCE : F = kN ! ! ! ! GRAVITATIONAL CONSTANT : ! ! G = 9.810 L/T**2 ! ! CONSISTENCY ACCELERATION PARAMETER : ! ! GCONS = 0.1000E-02 (F/M)/(L/T**2) ! +--------------------------------------------------------+