CMS-Flow

CMS-Flow is a component of the Coastal Modeling System (CMS). It is a finite-volume numerical engine which presently includes various two dimensional capabilities. Present features are:

• Hydrodynamics - water levels and current flow values under any condition of tide, wind, surge, waves and river flow
• Sediment Transport - as bedload, suspended load, and total load dependent on various transport algorithms
• Morphology Change
• Salinity Transport

For more information on the model itself, refer to the users manual published by USACE-ERDC.

Pre- and post-processing of CMS-Flow grids is accomplished with the Surface-water Modeling System (SMS), version 10.0 and later. The user can set up and edit computational grids, specify model parameters, define interaction of this model with the wave counterpart (CMS-Wave), launch the model and visualize the results.

The model is intended to be run on a project-scale, meaning the domain should only be on the order of 1-100 kilometers in length and width; however, future features will allow for more regional applications. The following sections describe the interface and make recommendations for the applications of the model.

Graphical Interface

The CMS-Flow Graphical Interface is contained in the UGrid Module as well as the Map Module and includes tools to create and edit a CMS-Flow simulation. The simulation consists of a geometric definition of the model domain (the grid) and a set of numerical parameters. The parameters define the boundary conditions and options pertinent to the model.

The interface is accessed by creating a CMS-Flow grid from Map Module. If a grid has already been created for a CMS-Flow simulation or an existing simulation read, the grid object will exist in the Project Explorer and selecting that object will make the UGrid module active. See Working with CMS Flow for more information.

Run-time parameters and setups are located in the CMS-Model Control dialog portion of the graphical interface.

Feature List

Information about the Features available for CMS-Flow are listed below. Additional information about these features can be found by clicking here here or on the individual links below.

• Boundary Condition Forcing
  • Water Surface Elevation
  • Water Surface Elevation and Velocity
  • River Flow Forcing
  • Salinity Concentration Forcing
• Global Forcing
  • Wind Forcing
  • Wave Forcing
• Transport Options
  • Sediment Transport
    • Non-equilibrium Algorithm (NET)
    • Total Load Algorithm
  • Salinity Transport
• Other Processes
  • Bottom Friction
  • Hard Bottom
  • Variable D50
  • Eddy Viscosity
• Other Features
  • Parallelization -- Animation
• Units of Measurement

Upcoming Features

• Implicit Solver -- CMS-2D Version 4 Beta 2 - Released: June 2010
• Telescoping Grid Capability -- Scheduled release: July 2010
• Cohesive Sediment Transport -- Scheduled release: July 2010

Case Studies / Sample Problems

The following tutorials may be helpful for learning to use CMS-Flow in SMS:

• Models Section
  • CMS - CMS-Flow

Links and References

• SMS Models page
• CMS-Wave

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• Sep 2008 Modeling of Morphologic Changes Caused by Inlet Management Strategies at Big Sarasota Pass, Florida [1]
• Jul 2007 ERDC/CHL CHETN-IV-69 Tips for Developing Bathymetry Grids for Coastal Modeling System Applications [2]
• Aug 2006 ERDC/CHL TR-06-9 Two-Dimensional Depth-Averaged Circulation Model CMS-M2D: Version 3.0, Report 2, Sediment Transport and Morphology Change [3]
• Feb 2006 ERDC/CHL CHETN-IV-67 Frequently-Asked Questions (FAQs) About Coastal Inlets and U.S. Army Corps of Engineers' Coastal Inlets Research Program (CIRP) [4] Updated FAQ Website [5]
• May 2005 ERDC/CHL CHETN-IV-63 Representation of Nonerodible (Hard) Bottom in Two-Dimensional Morphology Change Models [6]
• May 2004 ERDC/CHL TR-04-2 Two-Dimensional Depth-Averaged Circulation Model M2D: Version 2.0, Report 1, Technical Documentation and User’s Guide [7]
• Dec 2003 ERDC/CHL CHETN-IV-60 SMS Steering Module for Coupling Waves and Currents, 2: M2D and STWAVE [8]