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EM.Ferma

975 bytes added, 15:36, 27 May 2015
/* Computational Domain and Boundary Conditions */
[[Image:fermbc.png|thumb|200px|Boundary Condition Dialog]]
In EM.Ferma, the Poisson or Laplace equations are solved subject to boundary conditions using the Finite Difference technique. As a result, you need to specify a finite computational domain and then specify the domain boundary conditions.EM.Ferma's computational domain defines where the domain boundary condition will be specified. A default domain box is always placed in the project workspace as soon as you draw your first object. The domain can be seen as a blue cubic wireframe that surrounds all of the CAD objects in the project workspace.  
[[Image:qsource2.png|thumb|200px|The blue wireframe around the CAD objects defines the extents of the computational domain. The specified boundary conditions are applied on the domain walls. ]]
EM.Ferma's computational domain defines where the domain boundary condition will be specified. The domain can be seen as a blue cubic wireframe that surrounds all of the CAD objects in the project workspace. To modify the domain settings, find click the Domain button of the Simulate Toolbar or right-click on "3D Static Domain" entry in the navigation tree, right-click on it, Navigation Tree and select "Domain Settings..."from the contextual menu. The domain dialog will appear. In the domain dialogDomain Settings Dialog, the computational domain boundary can be specified defined in terms of either two different ways: Default and Custom. The default type places an enclosing box with a custom, fixed location, or as custom offsets specified offset from the largest bounding box of your project's CAD objects . The default offset value is 20 project units, but you can change this value arbitrarily. The custom type defines a fixed domain box by specifying the coordinates of its two opposite corners labeled Min and Max in the sceneworld coordinate system.  
EM.Ferma allows the user you to either specify the electric potential boundary conditions on the boundary (domain box. Two options are available. The Dirichlet boundary condition), or specify is the normal derivative default option and is specified as a fixed potential value on the boundary (surface of the domain walls. By default, this value is 0 Volts. The Neumann boundary condition) via a specified field strength. To modify specifies the boundary condition, find "Boundary Conditions" normal derivative of the electric scalar potential on the navigation tree, and select "Boundary Conditionssurface of the domain walls...". The user will be prompted with This is equivalent to the dialog seen at rightnormal electric field component on the domain walls and its value is specified in V/m.
The magnetostatic simulation engine always assumes Dirichlet domain boundary conditions and sets the values of the magnetic vector potential to zero on all the domain walls. To modify the boundary conditions, right-click on "Boundary Conditions" in the Navigation Tree, and select "Boundary Conditions..." from the contextual menu to open the Boundary Conditions Dialog.
== Observables in EM.Ferma ==
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