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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.

Electrokinetic Flow in a Bio Chip

Miniature laboratories are required to efficiently analyze the information in the human DNA. One of the problems that arise in these lab-on-chip devices is in the transport of the liquid samples and other solutions in the chip, which are of very small dimensions. One way of transporting the fluid in the samples is through the use of electrokinetic effects, where the charged ions in the ...

Thick Wall Cylinder Benchmark Problem

A thick wall cylinder is exposed to both internal and external pressure and thermal load. The model is both plane and axisymmetric. The results are compared to the analytic solution.

Distributed SPICE Model of Bipolar Transistor

Integrated semiconductor devices are used in almost all electrical equipment, and the bipolar junction transistor (BJT) is still a very important device although the MOS technology has taken over a large part of the market. Especially in technologies with new types of semiconductors the bipolar transistor can be the best choice for optimum performance. The BJT consists of three semiconductor ...

Wrapped Thick Cylinder under Pressure and Thermal Loading

This model is compared to a NAFEMS benchmark for composite material modeling, No R0031/2. The geometry is a long, thick, and hollow cylinder consisting of two layers, where an internal pressure is applied. The inner layer is made from an isotropic material, while the outer layer is made from an orthotropic material. This material's properties are equal in the radial and axial directions, yet ...

Multipactor

Multipaction can occur when electrons are accelerated by a high frequency RF field into surfaces. Secondary electron emission can occur and under the right conditions there can be an exponential growth in the number of electrons. The multipaction effect is strongest at a specific RF frequency, which depends on the dimensions of the device and the applied voltage.\n\nThis model requires the ...

Simulation of an Electromagnetic Sounding Method for Oil Prospecting

The marine controlled source electromagnetics method (CSEM) for oil prospecting has emerged as a promising technique during recent years. This model demonstrates one variant of it. It uses a mobile horizontal 1 Hz electric dipole antenna that is towed 150 m above the sea floor. An array of sea floor receivers measure the electric field at various distances away from the antenna. When measuring ...

Perforated Well

Analysis of fluid flow into wells often begins with the assumption that the intake fluid is uniform along the entire length of wellbore. This assumption runs into trouble when applied to the modeling of perforated wells. When these wells are emplaced, the deep bore hole is lined by impermeable materials. Later a machine pierces the lining intake fluids in the productive reservoir zones and ...

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 ...

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 ...

1D Plane Slider bearing

This benchmark model computes the load-carrying capacity of a one dimensional hydrodynamic slider bearing. The results are compared with analytic expressions obtained by solving the Reynolds equations directly in this simple case.

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