Downloads
Since 1989, NCCHE has been supported by the USDA Agricultural Research Service by means of funds appropriated by the U.S. Congress, with a mandate to develop state-of-the-art numerical models for simulating flow and sedimentation processes in the natural environment. Since then a suite of 1D, 2D and 3D computer models have been developed, verified, refined, validated, documented and applied to simulate a variety of free surface flow and sediment transport-related phenomena.
Versions of the CCHE1D, CCHE2D (32-bit with GUI) and Mesh Generator software packages are available for download. The software is available for testing and use free of charge. Please be aware that, due to limited resources at NCCHE, these versions are no longer supported.
The latest NCCHE models are all 64-bit and modularized:
CCHE2D-FLW, CHE2D-FLOOD, CCHE2D-SED, CCHE2D-CHEM, CCHE2D-WQ, CCHE2D-COAST
CCHE3D-FLW, CCHE3D-SED, CCHE3D-WQ
They can also be used at no cost through collaborative research with NCCHE. Test models with limitations can be downloaded from this site.
Special note regarding CCHE2D and CCHE3D: For many years, CCHE2D has been made available to the public free of charge. During this time, thousands of users have downloaded and applied this basic model for free surface flows and sediment transport studies. We are pleased that this model has benefited the research, development and engineering applications of so many. Going forward, this free basic model will no longer be supported, due to the high costs associated with its development, maintenance and support obligations.
In order to promote and sustain technology development and transfer, CCHE2D has recently been copyrighted by the University of the Mississippi. It is available commercially from this point on. The full version of CCHE2D has been further refined, updated, and made more capable (flood, sediment transport, cohesive sediment transport, pollutant transport, bank erosion, water quality, coastal storm surge, coastal waves, in-stream structures, etc.) and it is fully supported. Additionally, CCHE3D, a three-dimensional model for free surface turbulent flow and sediment transport modeling, has also been developed for commercial use. Trial versions of both of these models, as well as details on the availability and pricing for the models and modules, can be found at: www.comphydrotech.com.
U.S. Federal agencies and national or international institutions that have supported the development of these models will still have access to the commercial versions for free or according to specific agreements. For more information, please contact us via email at web@ncche.olemiss.edu or info@comphydrotech.com.
CCHE1D
CCHE1D is a software package for simulations of one-dimensional unsteady flows and sediment transport in dendritic channel networks. The software package has been designed to facilitate the combined modeling of watershed and channel processes.
CCHE1D’s hydrodynamic model includes special procedures for the computation of flow across hydraulic structures like culverts, low and high-drop structures, bridge crossings, and measuring flumes.
The sediment transport module computes non-equilibrium transport of non-uniform sediment mixtures. It has been designed for long-term predictions of channel morphological changes, and it can be used to evaluate the effectiveness of in-channel remedial and control structures on the sediment yield.
The CCHE1D water quality module simulates the transport and fate of nutrients and other pollutants in channel networks, including the biogeochemical reactions that take place in the streams.
An ArcView GIS graphical interface facilitates the data management and the integration of the channel model with watershed models and other tools. It also includes a landscape analysis module that delineates the drainage network and corresponding subcatchments based on digital elevation data.
CCHE2D+GUI
CCHE2D is an integrated software package developed at the National Center for Computational Hydroscience and Engineering, the University of Mississippi. It is a general model for two-dimensional simulation and analysis of river flows, dam break flows, non-uniform sediment transport, morphologic processes, coastal processes, pollutant transport and water quality. These processes are solved with the depth integrated Reynolds equations, mass transport equations, sediment sorting equation, bed load and bed deformation equations. This model is based on Efficient Element Method, a collocation approach of the Weighted Residual Method. Internal hydraulic structures, such as dams, gates and weirs, can be formulated and simulated synchronously with the flow. Dry and wet capability enables one to simulate flows with complex topography with ease. Three turbulence closure schemes, depth-averaged parabolic, mixing length eddy viscosity models and k- e model, and available. The numerical scheme can handle subcritical, supercritical flows and their transition.
A Graphic User Interface (GUI) is developed for applications of CCHE2D. The GUI drives and manages simulations, it is a user friendly tool. Starting with a computational mesh, the GUI helps users to setup parameters, boundary conditions and to run the simulations and visualize the computational results. Not all of the capabilities of the CCHE2D are accessible from the GUI due to limitations of resources.
Interactive, graphical user interfaces (GUIs) are being developed for the NCCHE flow, sediment transport, and water quality models. Each GUI provides a convenient environment for input data preparation and model operation. They also provide advanced visualization capabilities and tools to facilitate the application of the NCCHE models to real-life engineering problems.
Each graphical interface program has been designed to provide the most convenient set of tools for the model user. The CCHE1D interface program is integrated into ArcView GIS to facilitate the use of GIS data and to simplify integration with watershed models. The CCHE2D and CCHE3D GUIs are implemented using OpenGL to provide fast, high quality computer graphics, including the production of video animations.
Graphical interfaces for the CCHE1D and CCHE2D models are part of free software packages, and are distributed with the respective models.
Mesh Generator (2D & 3D)
NCCHE has developed a complete, interactive mesh generation program to support both the CCHE2D and CCHE3D models. The program includes several techniques for the generation and optimization of structured meshes.
This graphical program allows the rapid creation of complex mesh systems. Several algebraic and numerical methods are available for the generation of boundary-fitted meshes. A novel multi-block approach facilitates mesh generation for complex geometries.
The NCCHE Mesh Generator is distributed as free software, and it is part of the CCHE2D modeling package.