The use of transients as a diagnostic tool in pressurized pipe networks requires reliable and efficient numerical models. The traditional models derived in the frequency domain as solutions to the linearized water hammer equations, namely the impulse response and the transfer matrix methods, are efficient in the simulation but are not suited for complex arbitrarily configured networks. An alternative frequency domain formulation is the Network Admittance Matrix Method (NAMM), where the equations are reorganized into a matrix form using graph-theoretic concepts. In this paper the similitude between steady-state Global Gradient Approach (GGA) and the unsteady- state and NAMM formulation are explored. The resulting improvements on the efficiency of the models are tested on two case studies.
Frequency-Domain Modeling of Transients in Pipe Networks with Compound Nodes Using a Laplace-Domain Admittance Matrix
