Revision as of 08:13, 8 June 2013

GetDP is a rather general open source finite element solver using mixed elements to discretize de Rham-type complexes in one, two and three dimensions. GetDP is developed by the ACE group from the Montefiore Institute at the University of Liège, and is released under the GNU GPL.

Getting started

ONELAB allows to use GetDP as a black-box solver: you don't need to know anything about finite elements or de Rham complexes in order to run your first simulations:

1. Download and uncompress the Gmsh/GetDP bundle for Windows64, Windows32, Linux64, Linux32 or MacOSX. (If you prefer you can of course also download and install Gmsh and GetDP independently.)
2. Double-click on the Gmsh executable (gmsh.exe
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   on Windows).
3. Load one of the GetDP models (.pro file) through the File/Open menu, e.g. magnet.pro for the Template:GetDPFile example.
4. Click on Run.
5. ... that's it!

• Magnet-1.png

  Launch Gmsh and load the GetDP model magnet.pro with the File/Open menu.

• Magnet-2.png

  Click on Run to launch a computation. You can change any parameter and then Run again!

Featured GetDP models

• Electric Machines
• Electromechanical Relay
• Magnetodynamics with cohomology conditions
• Multiple scattering with Sommerfeld ABC and with Perfectly Matched Layer (PML)
• Time reversal in free space

All GetDP models

Category:GetDP

How does it work?

ONELAB numeric parameters can be defined directly in the .pro files through the DefineConstant syntax:

DefineConstant[ x = 1 ];
DefineConstant[ x = {1, Label "My variable"} ];
DefineConstant[ x = {1, Label "My variable", Choices {0,1}} ];
DefineConstant[ x = {1, Label "My variable", Choices {0,3,5}} ];
DefineConstant[ x = {1, Label "My variable", Choices {0="Zero",3="Three", 5="Five"}} ];
DefineConstant[ x = {1, Label "My variable", Min 0, Max 50, Step 5} ]
DefineConstant[ x = {1, Label "My variable", Min 0, Max 50, Step 5, Path "Variables/input/"} ];

When the .pro file is analyzed, if the parameter has not been previously defined, it takes the value provided in DefineConstant and is sent to the ONELAB server. If the .pro file is re-analyzed later, the value will be updated using the value from the server (unless it is labeled ReadOnly: see below). The same syntax can be used to define string parameters:

DefineConstant[ s = "a" ];
DefineConstant[ s = {"a", Label "My string variable"} ];
DefineConstant[ s = {"a", Label "My string variable", Choices {"a", "b", "c"} } ];
DefineConstant[ x = {"a", Label "My string variable", Kind "File"} ]
DefineConstant[ x = {"a", Label "My variable", Path "Variables/Input/"} ];

Here's the list of attributes available for all ONELAB parameters:

Label string

User-friendly label used in the graphical user interface

Path

Full path of the parameter in the ONELAB server (represented as a tree in the graphical user interface)

ReadOnly 0|1

If ReadOnly is set, the value cannot be changed server-side, and the value provided in DefineConstant is always used

Highlight color_string

Color used to draw the widget in the graphical interface

Visible 0|1

Should the parameter be visible in the interface?

Closed 0|1

Should the subtree containing this variable be closed?

Help string

Help string for this parameter

AutoCheck 0|1

Allows to disable automatic "check" (rebuild of the interface) when the value is changed

In addition, numbers can take the following specific attributes:

Min number

Max number

Step number

Range {number, number, ...}

ReadOnlyRange 0|1

Loop string

Graph string

String accepts the following specific attributes:

Kind string

Choices {string, string, ...}

MultipleSelection 0|1

Macro string

GmshOption string