## Modeling a Sphere Falling on a Water Surface

##### Chandan Kumar January 4, 2018

A sphere slightly lighter than water is dropped into a small liquid-filled beaker. How do you model the resulting shape of the water surface and the motion of the sphere as it floats on the surface? In this blog post, we demonstrate how to model this system in the COMSOL Multiphysics® software. Although we are considering the case of a small sphere, the technique discussed here can be applied to other larger shapes as well.

### Modeling Cables in COMSOL Multiphysics®: 6-Part Tutorial Series

##### Brianne Costa December 29, 2017

Want a roadmap to modeling cables? We have a six-part tutorial series for you. The Cable Tutorial Series shows how to model an industrial-scale cable in the COMSOL Multiphysics® software and add-on AC/DC Module, and also serves as an introduction to modeling electromagnetic phenomena in general. The numerical model is based on standard cable designs and validated by reported figures. Keep reading for a sneak peek of what you’ll learn when you roll up your sleeves and start the series.

### A Simulation Color Table for Engineers with Color Vision Deficiency

##### Caty Fairclough December 27, 2017

When looking through scientific papers, it’s common to see colorful results. Although aesthetically pleasing to some, these results can be difficult to interpret for engineers with color vision deficiency (CVD). You may think that presenting results in grayscale could help, but humans are less able to discern between different shades of gray. So what’s the best option here?

### Calculating Thermodynamic Properties for Liquids and Gases

##### Ed Fontes December 26, 2017

You can easily describe composition- and temperature-dependent fluid properties using the thermodynamic properties database, available as of version 5.3a of the COMSOL Multiphysics® software. For reacting systems, the database computes enthalpy of formation and enthalpy of reaction. For fluid flow and heat and mass transfer, the database can compute viscosity, density, heat capacity, thermal conductivity, and diffusivity of liquids and gases. For systems with several phases, the thermodynamic properties database computes the composition of the phases at equilibrium.

### Happy Birthday, Ernst Ruska

##### Caty Fairclough December 25, 2017

Ernst Ruska was an electrical engineer who earned a Nobel Prize in Physics in 1986. During his lifetime, he advanced the field of electron optics and developed the first electron microscope, enabling scientists to study objects too small to be observed with light microscopes.

#### Categories

##### Caty Fairclough December 21, 2017

You’re standing in a lab full of beakers containing different colored liquids. While it may look like something out of a cartoon, this is a lab for researching vanadium redox flow batteries (VRFBs). Unlike conventional batteries, the chemical energy in VRFBs is contained in liquid electrolytes that are stored in external tanks and pumped through the cell to convert to or from electrical energy. By advancing VRFB designs, engineers can improve grid energy storage and the reliability of renewable energy.

### 3 Examples of Equation-Based Modeling in COMSOL Multiphysics®

##### Caty Fairclough December 20, 2017

Creating new physics interfaces that you can save and share, modifying the underlying equations of a model, and simulating a wider variety of devices and processes: These are just a few ways you can benefit from the equation-based modeling capabilities of the COMSOL Multiphysics® software.

### How to Build Geometries from Elevation Data to Model Irregular Shapes

##### Hanna Gothäll December 19, 2017

In Part 2 of our blog series on how to model irregular shapes in the COMSOL Multiphysics® software, we focus on how to create a surface of an irregular shape based on elevation data stored in various formats such as text, an image, or a DEM file. This approach is best suited for data where the height (or elevation) is a function of x- and y-coordinates.

### Keynote Video: Using COMSOL Server™ for Product Development

##### Fanny Littmarck December 18, 2017

In a lineup of online shopping results, jackets labeled as being made with GORE-TEX® product technology signal “high quality” to the consumer. The company behind this technology, W. L. Gore & Associates, Inc., specializes in materials science for fabrics, medical products, and performance solutions. The companies that produce the end products rely on material that performs as expected. To accelerate their product development efforts, W. L. Gore & Associates, Inc. uses simulation, apps, and the COMSOL Server™ product.

### How to Model Fluid-Structure Interaction in a Water Balloon

##### Phillip Oberdorfer December 15, 2017

The physics behind filling a water balloon seem simple at first glance, but involve a rather complex interplay of fluid flow and a nonlinear hyperelastic material. Fortunately, it is easy to set up and solve this type of model in the COMSOL Multiphysics® software. Let’s see how…

### Introducing COMSOL® Software Version 5.3a

##### Andrew Griesmer December 14, 2017

Today marks the release of a new version of the COMSOL® software, which includes core functionality updates and major updates to the add-on modules. Read on for a brief introduction to some of the significant updates to the COMSOL Multiphysics® and COMSOL Server™ platform products and add-on modules.