FEATool Multiphysics v1.10
Finite Element Analysis Toolbox
This section describes how to use the FEATool Graphical User Interface (GUI). Please note that the GUI may look different depending on your system configuration, FEATool and MATLAB versions.
After launching FEATool in MATLAB (by typing featool at the command prompt) the GUI will load. The main GUI window which will open is composed of the main GUI axes, top menu and toolbar, left vertical mode and tool button bars, and also command log and message windows. The functions of these GUI components are explained below.
The main GUI axes is where the geometry, computational grid, and postprocessing results are displayed. The view can be controlled by the Zoom In , Zoom Out , Pan , and Rotate buttons in the top toolbar.
On the top of the GUI toolbar there are menus for file, options, mode, and help operations. The function of these menus are described in detail below
The File menu features the following options
The Options menu allows the axes and grid settings to be modified (these settings are described in the axes/grid settings section below).
The Geometry menu allows for switching to Geometry Mode, creating geometry objects (Create Object), Copy/Transform Objects..., and also accessing the Combine Objects... option which allows specification of a complex formula for geometry object composition. Geometry export and import between CAD STL, Gmsh (geo), and Triangle (poly) formats is also supported.
The Grid menu allows for switching to Grid Mode, Converting Grid Cells between triangular and quadrilateral cells in 2D, and between tetrahedral and hexahedral cells in 3D, and showing Grid Statistics...
Grid Mode also supports import and export of grids through external ASCII format files, these option can also be accessed from the Grid menu
The Equation and Boundary menus allows for switching to Equation/Boundary Modes and also opening the Equation/Boundary Settings... dialog boxes (see the equation and boundary mode sections). Moreover, the Model Constant and Expressions... option allows for input of modeling variables and expressions that can be used in equations and boundary settings, and postprocessing. Point sources and constraints can also be added here with the corresponding Add Point Sources... and Add Point Constraints... menu options. In 3D the Add Edge Constraints... option is also available to add constraints on boundary edges.
The Solve menu similarly allows for switching to Solve Mode and also opening the Solver Settings... dialog box (these settings are described in the solver settings section). This menu also features an option to Get Initial Solution which computes the expressions defined in the equation settings Initial Condition fields and returns this as the solution.
The Post menu allows for switching to Postprocessing Mode, and opening the Postprocessing Settings... dialog box (see the postprocessing settings section below). In addition there are options for evaluating the minima and maxima for general expressions with Min/Max Evaluation..., points and line evaluation Point/Line Evaluation..., and integration of postprocessing expressions over subdomains Subdomain Integration... (calling intsubd) and boundaries Boundary Integration... (calling intbdr). Moreover, the solution and postprocessing data can also be exported to be used with the Export Results... menu option in CSV, Gemeral Mesh Viewer (GMV), and ParaView (VTK/VTP) file formats.
The Help menu can be used to access the FEATool Documentation... suite, FEATool Website..., Report Issues..., and open the the About... information dialog box which shows FEATool version information. Register FEATool... allows entering a FEATool registration token which is sent to the online licensing server to generate license keys.
The top GUI toolbar contains the following shortcut buttons (note that the GUI might show different options and icons depending on the MATLAB version used)
To the left of the main view axes is the mode toolbar which consists of six mode buttons which switches between the different modes
Below these buttons are the mode tool buttons which can change depending on which mode is selected.
In grid mode the overall global maximum grid cell size variable hmax can be changed with the Grid Size edit field and slider in the grid tools toolbar.
Below the main GUI axes is the output terminal window which displays messages, and output from the local FEATool workspace such as information from grid generation and solvers. (Hold Ctrl + left click to save the command log window output.)
The message window can display hints and tips that might be useful to your simulation. While running tutorial GUI scripts (.fes files) the modeling steps will be displayed here. (Hold Ctrl + left click to save the message window output.)
Pressing the New Model button or selecting New Model... from the File menu starts a new model definition and opens the New Model dialog box.
The New Problem dialog box firstly allows for selecting the number of space dimensions to work in. The Select Space Dimensions frame allows one to choose from 1D, 2D, Axi 2D (for axisymmetric cylindrical coordinate systems), and 3D. Depending on which selection is made the default Space Dimension Names (x, y, and z, or alternatively r and z in cylindrical coordinates) will be shown in the corresponding edit field. The space dimension or independent variable names can be changed if desired, and are used in FEATool defining equation, boundary, postprocessing, and other expressions.
The Select Physics drop down box shows a list of pre-defined physics application modes available for the selected space dimension. By choosing one of the physics modes the corresponding physics equation and default Dependent Variable Names will be updated. This will be the first physics mode defining a new model. The dependent variable names can also be changed as long as they do not conflict with each other or other physics modes. Additional physics modes can be added later by using the + tab in the Equation Settings dialog box in Subdomain Mode, as described the Multiphysics section.
To finish the initial selection process and start a new model press OK, or press Cancel to return to the previous model.
Equation, Boundary, Solve, and Postprocessing mode usage and corresponding dialog boxes are described in the following sections.
In the Axis/Grid Settings dialog box the Grid on option turns on and off the grid. By having Axis equal checked the x and-axes will have equal proportional lengths. Bounding box indicates how much extra relative space should be shown apart from the geometry. Alternatively, one can manually set the Axis limits. In 3D a slider control allows setting the transparency (opacity) of geometry objects.
The following keyboard shortcuts are available in FEATool
Moreover, in 2D Geometry mode one can hold down a Shift key while using the Create circle/ellipse tool to restrict to a circular geometry instead of allowing elliptical ones.