# Model Gallery

The Model Gallery features COMSOL Multiphysics model files from a wide variety of application areas including the electrical, mechanical, fluid, and chemical disciplines. You can download ready-to-use models and step-by-step instructions for building the model, and use these as a starting point for your own modeling work. Use the Quick Search to find models relevant to your area of expertise, and login or create a COMSOL Access account that is associated with a valid COMSOL license to download the model files.

### A Transport Problem

A transport problem, modeling stationary transport in one direction, with a discontinuous solution is solved to illustrate the effect of streamline diffusion. A pure stationary transport problems contains a convective term only. This means that oscillations and instabilities from the numerical method are some factors that need to be addressed. Streamline diffusion stabilizes oscillations ...

### A Magnetic Brake Modeled in 2D

This example studies a magnetic brake that slows down a copper disk rotating in the magnet’s air gap. The rotation induces currents, and forces along the current lines impede the disk’s motion. COMSOL Multiphysics models the static problem of computing the induced currents, Simulink computes the time-evolution of the angular velocity. In a second model, COMSOL Multiphysics’s extended ...

This model simulates a heated metal block and a thermal controller, demonstrating how to set up a communication between COMSOL Multiphysics and Simulink. The study of this thermal controller involves two distinct modeling situations: •Taken as a whole, this dynamic system assumes only a small number of states, making it a good candidate for modeling and simulation with Simulink. •One ...

### Resistive Heating of a Copper Plate

In this model, a copper plate with a hole through the center is subjected to a potential difference across two of the opposite sides. The potential difference induces a current that heats the plate. As the plate is heated, the conductivity of the material changes, this bi-directional coupling makes this model a true multiphysics model.

### Simulation of a Microrobot, 2D version

In this example, one of the legs of a silicon micro robot is modeled in COMSOL Multiphysics. A technique based on polyimide V-groove joints is used to get each of the legs to move. The polyimide has a relatively high coefficient of thermal expansion, and this causes the leg to bend slightly when the polyimide is heated. In the COMSOL Multiphysics simulation, a heat transfer model is coupled ...

### Vibrations in a Milk Container

This example illustrates a multiphysics application that involves a fluid-structure interaction. It simulates a filled milk container on a conveyor belt, which starts moving. The methodology presented here defines two problems, one for the container walls and one for the fluid. The two problems are subsequently merged into one problem using a special interface condition that imposes ...

### Deformation of a Feeder Clamp

This example analyzes the deformation of a feeder clamp under stress. The clamp secures a feeder that carries high-frequency electromagnetic fields, and it’s important that it remains as straight as possible. Forces on the clamp include both those from the feeder as well as those on the sleeve arising from the clamping screw. In this analysis, the feeder clamp is attached to a wall using ...

### Electrostatic Potential Between Two Cylinders

Two cylinders have opposite electrostatic potentials, and the difference in potential induces an electric field in the vacuum. In this 3D tutorial electrostatics model, we first build the geometry and then set up the model, solving for the electrostatic potential.

### Spherical Capacitor

In this model a capacitor consisting of two spherical copper layers with glass in between is studied. The capacitance is computed and compared with the analytical result.

### A Variety of Analyses of a Steel Component

This example shows a plane stress analysis of a mechanical component. The component is cut from a 4 mm steel plate. The thickness is small compared to the length and breadth in the x-y plane. Due to this, and the fact that the applied loads lie in the x-y plane, the out-of-plane stress can be assumed to be negligible. The plane stress application mode is based on this assumption. The ...