BOSS International


FESWMS is a hydrodynamic modeling code that supports both super and subcritical flow analysis, including area wetting and drying. The FESWMS model allows users to include weirs, culverts, drop inlets, and bridge piers in a standard 2D finite element model. SMS supports both pre- and post-processing for FESWMS.

» Overview


FESWMS-2DH is short for the Finite Element Surface Water Modeling System: 2-Dimensional Flow in a Horizontal Plane. It was developed to simulate surface water flow where motion is primarily horizontal. FESWMS was developed for and is sponsored by the Federal Highway Administration (FHWA).

To run FESWMS, data files which define the boundary conditions, material properties, and finite element mesh information are needed. The main file contains a list of input filenames to be used in the analysis, and filenames to be used for output of solutions. SMS can be used to define all boundary conditions and governing material properties.

FESWMS is used to compute water surface elevations and flow velocities at nodes in a finite element mesh representing a body of water such as a river, harbor, or estuary. Both steady state and transient solutions can be performed with FESWMS. Therefore, it is possible to model static flow conditions, as a river with constant flow, or dynamic flow conditions, as tidal fluctuations. FESWMS has capabilities which are well-suited for modeling weirs, piers, culverts, and drop inlets.

The output of FESWMS can be a binary or ASCII file containing velocity and water surface elevation for each node of the finite element mesh. The file format (binary or ASCII) is specified by the user in a data file before the solution is run. The output solution file can be read into SMS and viewed using post-processing tools.