An LPI Numerical Implicit Solution for Unsteady Mixed-Flow Simulation

by D. L. Fread,
Ming Jin,
Janice M. Lewis,



Document Type: Proceeding Paper

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

Abstract: A Local Partial Inertia (LPI) technique is developed as an option within the National Weather Service (NWS) FLDWAV dynamic flood routing model to enhance its capability to model unsteady flows with subcritical/supercritical mixed-flow regimes and moving interfaces. By neglecting varying portions of the inertial terms in the unsteady flow momentum equation according to the local Froude number, the LPI technique retains the essential accuracy associated with dynamic routing models and provides stable numerical solutions for mixed flows for the four-point implicit numerical scheme used in the FLDWAV model.

Subject Headings: Dynamic models | Numerical models | Unsteady flow | Model accuracy | Inertia | Flood routing | Hydrologic models

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