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Fluid Blog Posts

Coupling Heat Transfer with Subsurface Porous Media Flow

April 24, 2014

In the second part of our Geothermal Energy series, we focus on the coupled heat transport and subsurface flow processes that determine the thermal development of the subsurface due to geothermal heat production. The described processes are demonstrated in an example model of a hydrothermal doublet system.

Tips for Using the Wall Distance Interface

April 21, 2014

The Wall Distance interface is used to calculate the distance to a wall in the turbulent flow interfaces available in COMSOL Multiphysics. It can be combined with any other interface and comes in handy when we need to calculate the distance to the nearest wall or detect, as part of a dynamic model, when a moving object will hit a wall. Today, we will study how the Wall Distance interface works and how other interfaces can benefit from its capabilities.

What Kinds of FSI Problems Can COMSOL Multiphysics Solve?

April 14, 2014

One of the questions we get asked all the time is: “Can I use COMSOL Multiphysics for solving my fluid-structure interactions problems?” Of course the answer is yes, so let’s talk a little about the various fluid-structure interaction (FSI) modeling techniques. Along the way, we will introduce the add-on modules you will need for these various types of analyses.

Characterizing the Flow and Choosing the Right Interface

April 7, 2014

Fluid flow is involved in many engineering applications. In addition to typical CFD simulations, which replace experiments in wind tunnels, flow must also be considered in the cooling of electronic devices or in the chemical industry, where reacting species are transported by a fluid. COMSOL Multiphysics offers dedicated interfaces for various flow types. When should we use the Laminar Flow or Turbulent Flow interface?

Exploring Below the Surface with a Poroelastic Analysis

April 1, 2014

The Leaning Tower of Pisa is regarded as one of the most famous landmarks in the world, although geotechnical engineers probably view it more as a construction gaffe. To prevent such a leaning fate, it could be useful to run an analysis in order to predict possible subsidence due to poroelastic deformation.

Modeling Geothermal Processes with COMSOL Software

March 28, 2014

In this first entry of our new Geothermal Energy series, we introduce the concept of modeling geothermal processes and the many physical phenomena involved. We also show you an example model of a borehole heat exchanger.

Simulating Kelvin-Helmholtz Instability and Climate Dynamics

March 18, 2014

What do heated soap bubbles, wavy clouds, and Jupiter’s Great Red Spot have in common? Their formation depends on the dynamics of the shear layer existing between two parallel streams moving at different velocities. This unstable motion, called Kelvin-Helmholtz instability, is ubiquitous and plays an important role in the dynamics of climate, for example. Let’s take a closer look at the onset and evolution of this instability with the help of Computational Fluid Dynamics (CFD) analysis.

Defining Curvilinear Coordinates for Anisotropic Materials

March 11, 2014

A lot of materials have anisotropic properties and, in many cases, the anisotropy follows the shape of the material. The COMSOL Multiphysics® software offers different methods for defining curvilinear coordinate systems. Here, we discuss the concepts of each and when to use which method.


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