COMSOL Search

Showing results 21-40 of 694

Fluid Damper

Fluid dampers are used in military devices for shock isolation and in civil structures for suppressing earthquake-induced shaking and wind-induced vibrations, among many other applications. Fluid dampers work by dissipating the mechanical energy into heat. This model shows the phenomenon of viscous heating and consequent temperature increase in a fluid damper. Viscous heating is also important in microflow devices, w ...
www.comsol.com/model/8568

Michelson Interferometer

This model couples the Heat Transfer in Solids, Solid Mechanics and Geometrical Optics interfaces to compute the effect of thermal expansion of optical components on the interference pattern displayed by a Michelson interferometer. ...
www.comsol.com/model/19735

Microwave Filter on PCB

Microstrip filters can be fabricated directly on a printed circuit board (PCB) with a microstrip line going from the input to the output. Along the microstrip line there are a number of stubs of certain lengths and widths. The design of the filter involves choosing the impedance of the microstrip line, the impedance of the stub microstrips, and the length of the stubs. This particular filter has a seventh-pole low-p ...
www.comsol.com/model/4461

Chemical Reactions and Soot Build-Up in a Diesel Filter

In this tutorial, a filter system for a diesel engine is modeled, including where a soot layer builds up and is oxidized. The build-up of the layer is held in check by both catalytic and non-catalytic reactions, where carbon is oxidized to carbon monoxide and carbon dioxide, which in turn passes through the membrane. A filter system's efficiency and durability is closely related to the manner in which it removes soo ...
www.comsol.com/model/1394

Thermally Induced Focal Shift

A modern high-power industrial fiber laser system can deliver up to 3kW of single-mode laser radiation on to surfaces to be cut, drilled, welded or marked. Even using highly transmissive materials, the optical component used to focus the laser beam onto target surfaces can be affected by the large amount of power carried by the light. As the laser beam passes through the optical components, thermal expansion as we ...
www.comsol.com/model/19955

Superfilling Electrodeposition

This example illustrates the concept of superfilling in electrodeposition. The deposition rate is accelerated in concave areas of the surface, where the concentration of a surface catalyst is increased due to the area contraction of the moving boundary. ...
www.comsol.com/model/12343

Axisymmetric Condenser Microphone

This is a model of a condenser microphone with a simple axisymmetric geometry. The model aims to give a precise description of the physical working principles of such a microphone. The condenser microphone is considered to be the microphone with highest quality when performing precise acoustical measurements and with high-fidelity reproduction properties when performing sound recordings. This electro-mechanical acous ...
www.comsol.com/model/12377

The Brüel & Kjær 4134 Condenser Microphone

> Thermoacoustics Membrane Electrostatics Moving mesh ALE About Brüel and Kjær: Brüel & Kjær is a world leading manufacturer and supplier of sound and vibration test and measurement solutions. The products range from transducers (measurement microphones and vibration transducers), data acquisition and analysis software and hardware, hand held sound level meters ...
www.comsol.com/model/12375

Fluid-Structure Interaction in a Network of Blood Vessels

This model refers to a portion of the vascular system of a young child - the upper part of the aorta artery. The blood vessels are embedded in a biological tissue (the cardiac muscle) and, during the flow of blood, pressure is applied to the internal surfaces producing deformation of the vessel walls. The complete analysis consists of two distinct but coupled procedures: a fluid-dynamics analysis with t ...
www.comsol.com/model/660

Axisymmetric Condenser Microphone with Electrical Lumping

This model is that of a simple axisymmetric condenser microphone. The model includes all the relevant physics and determines the sensitivity of the specific microphone geometry and material parameters. The model uses a lumped approximation for the electric small signal problem but solves a full FE model for the acoustic-mechanical system. The quiescent (zero point) problem is solved fully using electrostatics and a m ...
www.comsol.com/model/10731

Electrode Growth Next to an Insulator

This example shows how to model secondary current distribution and electrode growth with a moving geometry. To avoid numerical instabilities, a seed layer is introduced in the initial geometry to obtain a right angle at the edge between the growing electrode and the insulator. ...
www.comsol.com/model/10212

Rising Bubble

the ALE (arbitrary Lagrangian-Eulerian) method. In this model, three different regions exist initially: the oil bubble, the oil at the top of the container, and the water surrounding the bubble. This example shows you how to use the Laminar Two Phase Flow interface. ...
www.comsol.com/model/177

Peristaltic Pump

In a peristaltic pump, rotating rollers squeeze a flexible tube. As the rollers move along the tube, the fluid in the tube follows the motion. The main advantage of the peristaltic pump is that no seals, valves or other internal parts ever touch the fluid. Due to their cleanliness, peristaltic pumps have found many applications in the pharmaceutical, chemical, biomedical and food industries. This COMSOL M ...
www.comsol.com/model/985

Galvanic Corrosion with Electrode Deformation

This 2D model demonstrates how to model a galvanic couple in which the corrosion of the anode causes a geometry deformation. The parameter data used is for an Magnesium Alloy (AE44) - mild steel couple in brine solution (salt water). ...
www.comsol.com/model/12423

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. ...
www.comsol.com/model/10437

Sensitivity Analysis of a Communication Mast Detail

The example Stiffness Analysis of a Communication Mast’s Diagonal Mounting in the COMSOL Multiphysics Model Library shows how you can modify a 3D CAD model to improve its performance. In that case, the applied changes were based solely on the analyst’s experience with similar structures. A senior design engineer can sometimes reach acceptable performance after analyzing only a handful of designs, while an un ...
www.comsol.com/model/4737

Localized Corrosion

Galvanic corrosion between two different phases (alpha and beta phases) in a metallic (magnesium) alloy is simulated for a representative cross-sectional microstructure configuration. A key feature in the model formulation is the implementation of both anodic and cathodic regions at the electrode surface using a single boundary represented in terms of the level set function. ...
www.comsol.com/model/14591

Stability Analysis of ALE-Methods for Advection-Diffusion Problems

ALE-methods are frequently used to solve systems of partial differential equations (PDEs) on moving domains. The main idea of these methods is to incorporate the time evolution of the domain into the equations. However, the motion of the domain with respect to time induces convective fluxes in the resulting equations. These can lead to stability problems of the numerical method if they become too large. In this ...
www.comsol.com/paper/4887

ALE

Hi I am planning to use COMSOL for modeling Chemical Vapor Deposition. I am using Diffusion Reaction model to model my process. But the tricky part is moving the boundary as the deposition progresses. I am planning to use Deformed mesh (ALE) mode for this. But I haven't been able to run my simulation successfully. I think I am messing up in the ALE part. I have read the manual. But that hasn't helped. So, I have ...
www.comsol.com/community/forums/4-0/thread/22904

Modeling of the Bread Baking Process Using Moving Boundary and Arbitrary-Lagrangian-Eulerian (ALE) Approaches

moisture content. The Arbitrary-Lagrangian-Eulerian (ALE) method was applied to describe movement of mesh during volume expansion. COMSOL\'s simulation results were validated with experimental measurements of bread temperature and moisture content. This study demonstrated that formation of evaporation-condensation front, crust formation and volume expansion can be modeled using the finite element modeling approaches ...
www.comsol.com/paper/9295