# Application Gallery

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.

Search for tutorials and apps relevant to your area of expertise via the Quick Search feature. To download the MPH-files, log in or create a COMSOL Access account that is associated with a valid COMSOL license. Note that many of the examples featured here can also be accessed via the Application Libraries that are built into the COMSOL Multiphysics® software and available from the File menu.

### Mixed Diffuse-Specular Radiation Benchmark

This model shows how to use the Mathematical Particle Tracing interface to simulate mixed diffuse-specular reflection between surfaces in an enclosure. This model is separated in two parts. The first part compares the heat fluxes computed by the Mathematical Particle Tracing interface ... Read More

### Modeling the Forces in a Bicycle Rim

Bicycle wheels are laced tangentially if they are intended to be used with disc brakes, because a radial pattern gives rise to larger forces in the rim. Otherwise, these rim forces are largely independent of the braking force. Read More

### Response of a Rotor Under the Influence of Seal Forces

The fluid flow in seals causes a strong restoring radial force, opposing the shaft motion. Also, there is a cross coupled force due to the axial variation of the circumferential flow. The first type of force always has a stabilizing effect on the rotor, whereas the second one in certain ... Read More

### Uncertainty Quantification of the Ishigami Function

This example demonstrates how to perform uncertainty quantification analysis of the Ishigami function. This random function of three variables is a well-known benchmark used to test global sensitivity analysis and uncertainty quantification algorithms. The mean, standard deviation, ... Read More

### Maximizing the Eigenfrequency of a Shell

This model demonstrates how to use the Polynomial Shell feature to increase the lowest Eigenfrequency of a shell by deforming its shape. Read More

### Shape Optimization of a Water Heater

This model demonstrates how to find the optimal size and position of a water pipe in an air chamber, so that the energy absorption in the water is maximized. The objective is implemented as a constraint, so that the optimization terminates, when the desired performance is achieved. Read More

### Acoustics of Coupled Rooms Using the Acoustic Diffusion Equation

This verification model analyzes the acoustics of two coupled rooms using the Acoustic Diffusion Equation interface of the Acoustics Module. The results of the model agree with numerical results that are validated against measurements in a reference paper. Read More

### Wheel Rim — Topology Optimization with Milling Constraints

Topology optimization can result in novel designs due the extreme design freedom associated with the method. Conventional manufacturing techniques impose constraints on the geometry which are often violated by topology optimization. This model demonstrates how the milling constraint ... Read More

### Biosensor Designer for Use with COMSOL Client for Android™

COMSOL Client for Android™ is an app available in the Google Play™ store for users of COMSOL Server™. It includes features and functionality designed specifically for use with tablets and other mobile devices. The Biosensor Designer comes in two different layouts: ... Read More

### Topology Optimization of a Torsion Sphere with Milling Constraints

Topology optimization is associated with extreme design freedom which can yield extreme performance. The designs can be easier to manufacture by using milling constraints, at some cost to the performance. This example considers the case of a torsion sphere which is known to feature a ... Read More

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