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COMSOL 4.3b Multiphysics Software - Release Highlights

requirements. The new SCGS smoother is fully functional in combination with the Laminar Inflow boundary condition and removes previous limitations related to mesh anisotropy. View Screenshot Automatically Included Stefan Velocity The Stefan velocity is automatically accounted for in the Reacting Flow user interface. The Stefan velocity is acting in the normal velocity, and is always automatically added by the Wall feature. It is ...
www.comsol.com/products/4.3b

Gaining Insight into Piezoelectric Materials for Acoustic Streaming

Many sensors, such as flow sensors and those used in medical diagnostics, rely on microfluidic devices. However, mixing and pumping fluids becomes challenging because of the small size of these devices. As an alternative to traditional actuation methods, surface acoustic waves (SAWs) can be used to create fluid streaming. Through a collaboration between SUNY Albany and SEMATECH, researchers have modeled and simulated ...
www.comsol.com/story/19475

Pumping and Injecting from a Single Borehole

Professor Dr. Martin Sauter leads a group at the University of Göttingen in research on hydrogeology. Cooperating with Hölscher Wasserbau, a leading German dewatering company, the group is studying düsensauginfiltration (DSI), which is a technique for lowering groundwater levels at mining or construction sites. Traditionally, dewatering involves the transportation of water away from the site, while DSI keep ...
www.comsol.com/story/13633

Electrical Conductivity Modeling and Validation in Unidirectional Carbon Fiber Reinforced Polymer Composites

Carbon fiber (CF) reinforced polymer composites (CFRP) have begun to replace Al-Zn-Mg alloys in applications which require high strength-to-weight ratios. The anisotropy of CFRP composites is a result of melt crystallized extrusion techniques that impart an inherent directionality to the CFs and the associated material’s properties ...
www.comsol.com/paper/15958

Anisotropic Heat Transfer in Orthocyclically Wound Coils

Tecnotion produces linear motors for the high tech automation and semiconductor markets. Orthocyclically wound coils give the best performance because the largest number of windings can be packed into a given volume, as opposed to "wild winding", where the windings fall where they may. Additionally, the anisotropic heat conduction perpendicular to the wire direction is optimized because each winding is positioned exa ...
www.comsol.com/paper/14885

anisotropic properties

Hi Normally you need to define either a new Linear Elastic Material node with Anisotropy material in the settings, and then define the tensor w.r.t the global coordinate system, or change the default Lienar Elastic Material node ...
www.comsol.com/community/forums/general/thread/16150

Local coordinate system for material properties

Dear all, we are trying to do an eigenfrequency analysis of a car tire and are struggling with defining the correct elastic material properties for the tire plies. The tire plies are fibrous composites consisting of steel cords embedded in a rubber matrix. The steel coords are aligned at a certain, non-zero, angle with respect to the tire circumference (see the attached image), meaning that the ply is anisotrop ...
www.comsol.com/community/forums/general/thread/36480

Defining Curvilinear Coordinates for Anisotropic Materials

A lot of materials have anisotropic properties and, in many cases, the anisotropy follows the shape of the material. COMSOL Multiphysics offers different methods for defining curvilinear coordinate systems. Here, we discuss the concepts of each and when to use which method .... It is almost impossible to express the anisotropy referring to the well-known Cartesian coordinate system. If we had a coordinate system that follows the fibers, it would be straightforward to specify the anisotropic properties ...
www.comsol.com/blogs/defining-curvi...r-coordinates-anisotropic-materials

Piezoelectric Materials: Crystal Orientation and Poling Direction

The direct and inverse piezoelectric effects are strongly related to how anisotropic the material is, which in turn is related to the crystalline structure of the piezoelectric material. The extent of anisotropy can also be influenced by a process called poling. Here ... Curie temperature of the material. Working with Anisotropic Material Properties So we see that the piezoelectric effect arises inherently out of anisotropy in the crystal structure as well as poling ...
www.comsol.com/blogs/piezoelectric-...rystal-orientation-poling-direction

How to Model Residual Stresses Using COMSOL Multiphysics

is used to characterize the plastic deformation. It has been observed that metal sheets in deep drawing process no longer behave isotropically. There tends to be less plastic deformation through the thickness. Therefore, in die forming and deep drawing of sheets, we need a kind of anisotropy where the sheet is isotropic in-plane and has an increased strength in the perpendicular direction, called transverse ...
www.comsol.com/blogs/model-residual-stresses-using-comsol-multiphysics

Three-Port Ferrite Circulator

A microwave circulator is a multiport device in which a wave incident on Port 1 is coupled only into Port 2; a wave incident on Port 2 is coupled only into Port 3; and so on. Circulators are used to isolate microwave components, for example, to couple a transmitter and a receiver to a common antenna. They typically rely on anisotropic materials, most commonly ferrites. This model simulates the transmission of a 10 ...
www.comsol.com/model/968

Pressurized Orthotropic Container

A thin-walled container made out of rolled steel is subjected to inner overpressure. The material is represented with an elastic isotropic model together with Hill orthotropic plasticity. The principal directions of the material follow the geometrical shape of the structure and therefore a unique base vector system is created. The stress and plastic strain due to overpressure are evaluated. The results are in good ag ...
www.comsol.com/model/12669

Radially Polarized Spherical Piezoelectric Acoustic Transducer

This tutorial provides a step-by-step instruction to setup a fully-coupled 3D structural-acoustic interaction problem. Interaction between a vibrating spherical piezoelectric structure with the surrounding fluid media is considered. The piezoelectric material PZT-5H from the materials library is used. Instructions on how to create a radially polarized piezoelectric material in spherical coordinates is provided. Symme ...
www.comsol.com/model/6210

Dipolar Microwave Plasma Source

This model presents a 2D axisymmetric dipolar microwave plasma source sustained through resonant heating of the electrons. This is known as electron cyclotron resonance (ECR), which occurs when a suitable high magnetic flux density is present along with the microwaves. This is an advanced model that showcases many of the features that make COMSOL unique, including: Infinite elements for the magnetos ...
www.comsol.com/model/10512

A 3D Model of a Diesel Particulate Filter

Several factors influence a diesel particulate filter’s (DPF) efficiency and durability. Important issues include the removal of soot particles from the filter membranes and the influence of thermal stress on the ceramic structure, stress that arises during repeated operating cycles. Mathematical modeling provides a powerful tool for investigating such critical parameters under a wide range of operating conditio ...
www.comsol.com/model/1845

Polarized Circular Ports

This model of a circular waveguide demonstrates how to use ports with numerical solution of the port modes. It illustrates how to align the polarization of degenerate port modes and in particular how to model and excite the TE11 mode of circular waveguides in 3D. ...
www.comsol.com/model/14043

Acoustic Cloaking

Two articles in the New Journal of Physics describe how to derive necessary conditions on an anisotropic density tensor to create a perfect acoustic cloak in 2D, and show how this material can be realized in practice as a layered shell with isotropic properties in each layer. These two example files illustrate simplest possible implementations using both anisotropic density and the layered shell approach a ...
www.comsol.com/model/3867

GEC ICP Reactor, Argon Chemistry

The GEC cell was introduced by NIST in order to provide a standardized platform for experimental and modeling studies of discharges in different laboratories. The plasma is sustained via inductive heating. The Reference Cell operates as an inductively-coupled plasma in this model. This model investigates the electrical characteristics of the GEC reference cell for argon chemistry. ...
www.comsol.com/model/8649

3D Model of an ICP Reactor with Argon Chemistry

3D plasma modeling is possible to do in COMSOL. A square coil is placed on top of a dielectric window and is electrically excited at 13.56MHz. A plasma is formed in the chamber beneath the dielectric window, which contains Argon gas at low pressure (20 mtorr). The gas flows into the process chamber from two 2 inch ports and the gas is extracted through a single 4 inch port. The plasma is sustained via electromagnetic ...
www.comsol.com/model/8661

Impedance Matching of a Lossy Ferrite 3-port Circulator

A lossy ferrite circulator at 3GHz is modeled. Geometrical design parameters are varied to match the impedance for minimal reflection of the fundamental TE10 rectangular waveguide mode. ...
www.comsol.com/model/10302

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