The Water & Environmental Training Course consists of two and a half days of application-specific lectures and hands-on work. The intent of this format is to follow each lecture with an exercise in which the concepts of the previous lecture will be applied to a real-world simulation. A half-day of consultation is available on the third day for an extra fee.
The content of each lecture is given below:
Technical Foundations of FLOW-3D
The technical foundations of FLOW-3D are presented. Users will gain an understanding of the governing equations, the structured gridding methodology, TruVOF free surface tracking, and the FAVOR™ method for embedding complex geometries in structured grids.
Files, Units, and the User Interface
A guided tour of the FLOW-3D interface will be provided to help users understand how to manage simulations using the Navigator, recognize the input and output files, create/copy/restart simulations, and run and terminate simulations. A general overview of the interface layout is provided, along with guidance on selecting and applying unit systems.
This lecture provides post-processing basics: opening and reloading results files, generating 1-D, 2-D, and 3-D graphical and text output, and visualizing streamlines and path lines. More possible output options will be mentioned that will be covered in detail in later lectures.
The concepts of geometry building are covered including the fundamentals of component and subcomponent creation. Various methods of creating geometry will be covered including FLOW-3D primitives, CAD files, and topographic data. Techniques for checking and fixing stereolithography CAD files will be discussed. Geometry used to measure flow will also be covered: baffles, sampling volumes, and history probes.
The basics of creating computational meshes will be covered along with best practices for meshing and multi-block meshing. The relationship between mesh and geometry will be discussed, along with approaches to minimize mesh-related error.
Options for boundary conditions and adding/subtracting fluid within domains will be discussed, including symmetric boundaries, wall boundaries, continuative and outflow boundaries, velocity and volumetric flow rate boundaries, pressure boundaries, wave boundaries, grid overlay boundaries, and mass/mass-momentum sources. Boundary conditions common in hydraulic simulations will be presented for modeling reservoirs, inflow hydrographs, tailwater effects, and situations where upstream depth is unknown. Avoiding boundary over-specification will also be discussed.
Methods of initializing fluid in the simulation will be discussed with the goal of increasing stability and accelerating the simulation to a steady-state. Techniques for initializing pressure, temperature, density, and velocity distributions will be discussed. Defining fluid regions will be illustrated for both simple shapes and .stl geometry.
The following physical models will be discussed:
- Variable density flows
- Sediment scour and transport
- Buoyant flows
- Porous media
- Drift-flux (two-phase continuous/discrete flow)
- Depth-averaged flow
- Particles (with and without drag)
- Forces on structures
- Air entrainment
- Bubble models
- Solid motion (gates, valves, machinery, debris)
Mathematical options for specifying time steps, pressure solutions, geometry embedding, and physics model solutions will be presented. The focus will be on identifying situations where higher order numerical methods are warranted, increasing simulation speed, and maintaining stability.
Simulation Diagnostics and Troubleshooting
This lecture describes how to interpret and respond to solver output messages and warnings: when to ignore messages, and when to change numerical options.
Attendees may optionally purchase an additional half-day to work on their simulations hands-on with Flow Science staff. This option is recommended for users who are already developing complex simulations, or who wish for the additional hands-on training specific to their application.