The Application Gallery features COMSOL Multiphysics® tutorial and demo app files pertinent to the electrical, structural, acoustics, fluid, heat, and chemical disciplines. You can use these examples as a starting point for your own simulation work by downloading the tutorial model or demo app file and its accompanying instructions.

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Computing the Resistance of a Wire

Every electrical device has some resistance. That is, when a voltage difference is applied across any two terminals of the device, there will be a directly proportional current flow. This model demonstrates how to compute the resistance of a short section of copper wire. The convergence of the solution with respect to the mesh size is also studied.

Generator Models in 2D and 3D

These models demonstrate how to setup a sector model of rotating machinery both in 2D and 3D using *Rotating Machinery, Magnetic* interface in COMSOL Multiphysics. The stator in these permanent magnet ac generator examples consists of stator winding backed by iron core. The rotor includes the permanent magnets and iron core. The 2D and 3D model of the generator are included here. In 2D, the ...

Eddy Currents in a Cylinder

The eddy currents in a conductive cylinder, generated from currents passing through a surrounding coil, are studied. The skin effect in the coil is also studied.

Magnet Falling Through Copper Tube

A cylindrical magnet falling through a copper tube induces eddy currents on the tube walls, which in turn, create a magnetic field that opposes the magnetic field of the magnet and induces a braking force that opposes the motion of the magnet. This model computes the velocity of the magnet after it is dropped, as it reaches its terminal velocity at which the magnetic braking force equals the ...

Electromagnetic Forces on Parallel Current-Carrying Wires

This model shows a setup of two parallel wires with a constant current running through both. Their cross-sections are successively reduced until a set force per unit length is reached.

Rotating Machinery 3D Tutorial

This is a tutorial how to set up electric machinery in 3D using a combination of the magnetic fields and magnetic fields no currents interfaces.

Generator in 3D

This model is a static 3D simulation of a generator having a rotor with permanent magnets. The center of the rotor consists of annealed medium carbon steel, which is a nonlinear ferromagnetic material that is saturated at high magnetic flux densities. The core is surrounded by several blocks of a permanent magnet made of samarium and cobalt, creating a strong magnetic field. The stator is made ...

Induction Heating of a Steel Billet

Induction heating is a method used to heat metals for forging and other applications. Compared with more traditional heating methods, such as gas or electric furnaces, induction heating delivers heating power directly to the piece in a more controlled way and allows for a faster processing time. The Induction Heating of a Steel Billet application can be used to design a simple induction heating ...

Modeling a Spiral Inductor Coil

Spiral inductor coils are attractive because they can be integrated easily while electroplating other printed circuits and provide robust inductance values. Models of such spiral inductors can become quite large as the number of turns increases. This example demonstrates how to exploit the near-symmetry of the structure to greatly reduce the model size. An eight-turn octagonal spiral coil is ...

Eddy Currents 3D

Induced eddy currents and associated thermal loads is of interest in many high power AC applications. This example is of general nature and illustrates some of the involved physics as well as suitable modeling techniques in the AC/DC Module. In this model a metallic plate is placed near a 50 Hz AC conductor. The resulting eddy current distribution in the plate depends on the conductivity and ...