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COMSOL 4.3b Multiphysics Software - Release Highlights

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 initialized as zero. When a Flux or Mass Fraction feature is added on the same boundary, a corresponding ...
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. Electrical conductivity was modeled across the entire CF loading range (from neat ...
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

Topology Optimization of Lithium-Ion Battery Electrode Microstructure Morphology for Reduction of Damage Accumulation and Longevity of Battery Life

Cluster Computing study node in convergence studies and the use of the Cluster Sweep study node in parametric and more advanced shape optimizations (in future works). Thus far, an isotropic continuum damage evolution law derived from Weibull's distribution formulation was coupled with mechano-diffusion physics within COMSOL. Inclusion of anisotropy yields marginal effects on the mechano-diffusion responses (Figure 2 ...
www.comsol.com/paper/19591

Efficient, Selective Piezoeletric Wave Transduction Using Interdigitated Electrodes

This work enunciates the principles of SAW design from a physical perspective, examining the standard engineering modelling assumptions in some detail. An integral form analytical expression based on 2D elastic isotropic theory is validated against a COMSOL Multiphysics® simulation, corresponding to the traditional COM approach. Next, a COMSOL model of the full 3D problem, including anisotropy, piezoelastic ...
www.comsol.com/paper/18969

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 (all of "Solid" in V4 -- Good luck Ivar ...
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

Modelling Anisotropic metamaterials

Is it possible to specify permittivity and permeability values of an anisotropic material directly in cylindrical coordinates i.e εr,εθ and εz in the RF solver or it needs to be converted to cartesian coordinate system first? ...
www.comsol.com/community/forums/general/thread/61501

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. Anisotropic Properties Anisotropic properties are found in a wide variety of areas, such as rock formations with ...
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, I’ll discuss how you can correctly model the crystal orientation and poling direction of a piezoelectric material in your COMSOL simulations ...
www.comsol.com/blogs/piezoelectric-...rystal-orientation-poling-direction

Modeling Linear Elastic Materials - How Difficult Can It Be?

The most fundamental material model for structural mechanics analysis is the linear elastic model. Trivial as it may sound, there are some important details that may not be obvious at first glance. In this blog post, we will dive deeper into the theory and application of this material model and give an overview of isotropy and anisotropy, allowable values for material data, incompressibility, and interaction with ...
www.comsol.com/blogs/modeling-linea...c-materials-how-difficult-can-it-be

Using Perfectly Matched Layers and Scattering Boundary Conditions for Wave Electromagnetics Problems

>. Although PMLs are theoretically non-reflecting, they do exhibit some reflection due to the numerical discretization: the mesh. To minimize this reflection, we want to use a mesh in the PML that aligns with the anisotropy in the material properties. The appropriate PML meshes are shown below, for 2D circular and 3D spherical domains. Cartesian and spherical PMLs and their appropriate usage are also discussed within the ...
www.comsol.com/blogs/using-perfectl...-for-wave-electromagnetics-problems

How to Get the Most out of Arrow Plots in COMSOL Multiphysics

Winning the Assignment with Arrow Plots In the situation of the pump designers mentioned above, the geometry of the entrance in combination with certain water levels created much worse flow distortion effects than those from the elbow bend. Now, to be clear, there are other postprocessing methods to put hard numbers on how quickly (or slowly) the anisotropy dissipates. However, in this specific case, the ...
www.comsol.com/blogs/get-arrow-plots-comsol-multiphysics

How to Model Residual Stresses Using COMSOL Multiphysics

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 isotropy. Below, we have illustrated the ...
www.comsol.com/blogs/model-residual-stresses-using-comsol-multiphysics

Modeling of Materials in Wave Electromagnetics Problems

strong magnetic properties with an anisotropy that can be controlled by an applied DC magnetic field. Opposed to iron, ferrimagnetic materials have a very low conductivity, so that high-frequency electromagnetic fields are able to penetrate into and interact with the bulk material. This tutorial demonstrates how to ...
www.comsol.com/blogs/modeling-of-ma...s-in-wave-electromagnetics-problems

Sheet Metal Forming with Orthotropic Plasticity Hill '48

Metal Forming is the metalworking process of reshaping metal parts through mechanical deformation without adding or removing material. This is mainly based on plastic deformation that enables permanent deformation of the bodies. Here, a numerical simulation of the sheet metal forming process was carried out using an orthotropic material law for metal plasticity (Hill '48). Different forming processes are used in ...
www.comsol.com/model/18051

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 of rolled steel is subjected to an internal overpressure. As an effect of the manufacturing method, one of the three material principal directions—the out-of- plane direction— has a higher yield stress than the other two. Hill’s orthotropic plasticity is used to model the differences in yield strength. The model also shows how to define and use curvilinear coordinates aligned with t ...
www.comsol.com/model/12669

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