COMSOL 5.1 MODULE PRICES HOW TO

In almost all cases, the Magnetic Insulation and Perfect Magnetic Conductor boundary conditions are sufficient to significantly reduce the size of your model. On the other hand, if a voltage excitation is used, then the postprocessed coil current must be scaled up by a factor of two for each Perfect Magnetic Conductor symmetry plane. Since the Perfect Magnetic Conductor condition cuts the coil in half, it is important to divide the applied current in half when a current excitation is used. The Perfect Magnetic Conductor condition is used at the plane along which the current will flow tangentially. If the coil is excited with current, the applied current does not need to be changed, but the postprocessed coil voltage should be scaled by a factor of two for each Magnetic Insulation symmetry condition. If the coil is excited with a voltage boundary condition, it is important to reduce the voltage by a factor of two for each Magnetic Insulation symmetry condition applied. The Magnetic Insulation boundary condition is applied at the two boundaries representing the planes through which the current will flow normally. The Magnetic Insulation ( magenta) and Perfect Magnetic Conductor ( cyan) boundary conditions are applied along the appropriate symmetry planes for this problem. Orthogonal planes through the center of the coil are used to partition the domains as shown below.ДЄ one-eighth symmetry model of a rectangular coil with current flowing around the winding direction. The original geometry can be reduced in size to a one-eighth model representing the original geometry.

The modeling rule can be summarized: вЂњUse Perfect Magnetic Conductor to cut perpendicular to B and parallel to J.вЂќ The Simplified Coil Model This boundary condition enforces that the magnetic field can have no tangential component as you approach the boundary, so the magnetic field can only point in the normal direction and cannot change sign as you cross the boundary. The current vector will be exactly mirrored as you cross the plane and can have no normal component, so the current must flow tangentially. The Perfect Magnetic Conductor boundary condition - вЂњcut perpendicular to B and parallel to JвЂњ. From a mathematical point of view, it can be thought of as the вЂњoppositeвЂќ of the Magnetic Insulation boundary condition. The Perfect Magnetic Conductor boundary condition, on the other hand, represents a mirror symmetry plane for the current. The modeling rule can be summarized: вЂњUse Magnetic Insulation to cut perpendicular to J and parallel to B.вЂќ The Perfect Magnetic Conductor Boundary Condition As a consequence, this boundary condition has the physical interpretation of a boundary through which current can only flow in the normal direction.

That is, the magnetic field must be tangential to this boundary.

This boundary condition also means that the magnetic field is zero in the normal direction to the boundary. The Magnetic Insulation boundary condition - вЂњcut perpendicular to J and parallel to BвЂњ. The magnetic field will be exactly mirrored as you cross the plane. The Magnetic Insulation boundary condition represents a mirror symmetry plane for the magnetic field. The Magnetic Insulation Boundary Condition Let us now see how we can use this geometric symmetry as well as our knowledge of the magnetic field and what direction the current is flowing to reduce the size of our modeling domain. planes about which the geometry is exactly mirrored. This modeling domain has three planes of symmetry, i.e. Current flow ( blue arrows) and magnetic field are plotted. Note that the coil domain has a constant cross-sectional area as we follow the path of the current around it.ДЄ rectangular coil with current flowing around the winding direction. The Multi-turn coil feature is used to compute and apply a uniform current distribution around the profile of the coil, and the steady-state magnetic field is plotted. The lead wires that excite the coil are neglected from the model, and we treat the coil as a closed loop of current. The coil domain represents several hundred turns of wire wrapped around a rectangular profile. A spherical modeling domain contains a rectangular coil. Modeling a Coil with Three Symmetry PlanesДЇirst, let us look at a rectangular wound multi-turn coil, as shown in the figure below.

COMSOL 5.1 MODULE PRICES HOW TO

Today, we will introduce the three types of symmetry boundary conditions that you can exploit in your modeling and show how to use them. Whenever modeling magnetic fields in steady-state, transient, or frequency domain with the AC/DC Module, we want to reduce the size of the model as much as possible to minimize the computational resources and time needed to solve the model.

Comsol 5.1 module prices