Efficient Pump Representation for Fixed-Grid MOC in Pipeline Systems

by David H. Axworthy,
Bryan W. Karney, (M.ASCE),

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


An explicit solution of the pump power failure boundary condition is shown to have many computational advantages over the conventional implicit pump boundary condition solution (i.e., Newton-Raphson method). For example, only unsteady pump operation may be simulated by the Newton-Raphson method while computation of both steady and unsteady conditions are possible using the explicit solution. Thus, only one quasi-steady pump routine and one set of data need be maintained as opposed to the conventional practice of maintaining both a steady-state and a dedicated transient routine. In addition, applications show the ease by which complex and variable speed pump arrangements can be modelled using the explicit approach.

Subject Headings: Pumps | Simulation models | Power outage | Pipelines | Failure analysis | Boundary conditions | Transient response

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