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In 2D, the local coordinate system is defined by (t1, n, to), representing the tangential and normal direction of the boundary. This coordinate system is always right-oriented. The second tangent direction (to) is the cross product between normal vector (n) and the first tangent direction (t1). This method always gives a right-oriented orthonormal system, unless the tangent direction is parallel to the normal.
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In 3D, the local coordinate system is defined by (t1, t2, n), representing two tangential directions (t1 and t2) and one normal direction (n). This coordinate system is always right-oriented but not always orthogonal. The second tangent direction (t2) is the cross product between the specified normal vector (n) and the first tangent vector (t1). This method always gives a right-oriented orthonormal system, unless the tangent direction is parallel to the normal.
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Go to Name for information about the Settings window Label and Name. Also see Settings and Properties Windows for Feature Nodes.
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Many examples use this coordinate system. For one example, see Electric Sensor: Application Library path COMSOL_Multiphysics/Electromagnetics/electric_sensor.
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