Simulation: Settings 
Boundaries Boundaries
Due to the fact that a computer is only capable of calculating problems that have finite expansion, you need to specify the boundary conditions. This can be done within this dialog box.When you enter the boundaries property sheet, the modeled structure is displayed with a surrounding bounding box colored with regard to the boundary condition at each boundary. The picture on the right shows an example of such a bounding box.The assignment of the colors to the boundary conditions is listed together with the description of the different boundary conditions below. |
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You may double-click on the boundary conditions icon in the main plot window to select one boundary. By pressing the right mouse button in the main plot window, you can set the type of the boundary condition for the selected boundary using the popup menu.
Boundary conditions : Xmin / Xmax / Ymin / Ymax / Zmin / Zmax
Several boundary types are available, each applicable to any face of the project's bounding box (xmin/xmax/ymin/ymax/zmin/zmax).
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Electric: Operates like a perfect electric conductor, where the tangential components of electric fields and the normal components of magnetic fluxes are zero. This means that electric fields are normal to the boundary and magnetic fluxes are parallel to the boundary. For all magnetostatic or magnetoquasistatic applications electric boundary conditions correspond to tangential boundary conditions. For all electrostatic or electroquasistatic applications they correspond to normal boundary conditions. This boundary condition type is available for all EMS solvers.
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Magnetic: Operates like a perfect magnetic conductor, where the tangential components of magnetic fluxes and the normal components of electric fields are zero. This means that electric fields are parallel to the boundary and magnetic fluxes are normal to the boundary. For all magnetostatic or magnetoquasistatic applications magnetic boundary conditions correspond to normal boundary conditions. For all electrostatic or electroquasistatic applications they correspond to tangential boundary conditions. This boundary condition type is available for all EMS solvers.
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Open: Operates like free space
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Open (add space lf): Similar to the open boundary condition, with some extra space added between structure and applied boundary condition.
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Normal: Forces the tangential components of the electric, magnetic or current field (depending on your application) to be zero at the boundary. This means that the corresponding field has only normal components at the boundary. For all magnetostatic or magnetoquasistatic applications normal boundary conditions correspond to magnetic boundary conditions. For all electrostatic or electroquasistatic applications they correspond to electric boundary conditions. This boundary condition type is available for the electrostatic, magnetostatic stationary current and thermal solver.
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Tangential: Forces the normal components of the electric, magnetic or current field (depending on your application) to be zero at the boundary. For all magnetostatic or magnetoquasistatic applications tangential boundary conditions correspond to electric boundary conditions. For all electrostatic or electroquasistatic applications they correspond to magnetic boundary conditions. This boundary condition type is available for the electrostatic, magnetostatic stationary current and thermal solver.
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Please note that in general, source definitions at the boundary overwrite the boundary condition at the position of the source. For example, a current port positioned at a tangential boundary condition will still impose a current field normal to the boundary. For stationary current simulations, the interpretation of the boundary conditions is restricted to the boundary of the computational (i.e. conductive) domain. For more details, please refer to the Stationary Current Solver Overview.
For combined calculations one should always choose physical boundary conditions (electric, magnetic, open) instead of specific field boundaries (normal, tangential). The following table gives an overview how electric and magnetic fields develop on physical boundary conditions.
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Magnetic boundary |
Electric boundary |
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Open boundary...
Pressing this button opens the Settings for Open Boundaries dialog box, which offers the possibility to enter some settings regarding open boundaries. Consequently this button is only enabled if an open boundary condition is selected.
OK
Accepts your settings and leaves the dialog box.
Cancel
Closes this dialog box without performing any further action.
Help
Shows this help text.
See also
Boundary Conditions: Symmetry Planes, Boundary Potentials, Boundary Temperature, Thermal Boundaries
