![]() ![]() ![]() Results should be compared with those obtained with a steady friction model. Note: Quasi-steady and unsteady friction models are the result of current research by others. It uses this calculated value in the transient simulation. If a pipe has a nonzero flow at the initial steady-state, HAMMER automatically calculates a Darcy-Weisbach friction factor, f, based on the heads at each end of the pipe, the pipe length and diameter, and the flow in the pipe. If a pipe has zero flow at the initial steady-state, HAMMER use the Friction Coefficient specified in the Pipe Physical properties. Prior to beginning the transient calculations, HAMMER automatically determines the friction factor based on this information. In HAMMER, a hydraulic transient analysis usually begins with an Initial Conditions (steady state) calculation, which computes the heads and flows for every pipe in the system. Unsteady Friction, also known as transient frictionįor more information on the theory for each of these friction models, see Friction and Minor Losses. ![]() This can be accessed from the Transient Solver calculation options (Analysis > Calculation Options). The Transient Friction Method option enables you to select the methodology for determining flow resistance and friction losses during calculations.
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