HydroSim Consultants Limited

Investigation, Analysis and Computer Simulation of Transient

 and Steady Flow Conditions in Internal Fluid Flow Systems

Steady State Flow Analysis

Steady state flow analyses are performed using the computer program EPANET developed and distributed by the National Risk Management Research Laboratory of the U.S. Environmental Protection Agency.

Pressure Surge Analysis

Pressure (and mass) surge simulations are performed using the computer program PTRAN developed by Dr. Adrian P. Boldy. The program is based on the method of characteristics which converts the quasi-linear, hyperbolic, partial differential equations of motion and continuity describing the unsteady flow of a fluid in any internal flow system into a set of ordinary differential equations which are then expressed in a finite difference form in order to produce a solution algorithm. The variant of the method used is called the method of specified time intervals which computes the values for the piezometric pressure head and flow velocity at a constant time interval for each node in the system.