Viscosity Ramping Improves the Convergence of CFD Models

Angela Straccia | March 29, 2016

Are you solving turbulent flow problems in your CFD analyses? Then you may be familiar with the large computation time that can result from difficulties in finding the numerical solution. Such difficulties are caused by nonlinearities that arise in the turbulence model equations. Viscosity ramping can help decrease the computation time by solving for higher viscosities and using the solutions as initial conditions for the problem at lower viscosities. We’ll show you how to implement this technique in COMSOL Multiphysics.


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Bridget Cunningham | March 28, 2016

When you are new to the COMSOL Multiphysics® simulation software, it is important to have access to resources that can help you get started with the software quickly. The installation and introduction manuals provide useful details, covering the basics of the modeling environment as well as some more advanced topics. Starting with version 5.2, the Simplified Chinese installation option now offers access to a number of these manuals in versions that are translated into Chinese.


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Lauren Sansone | March 23, 2016

Ready, set, simulate! If you are looking to improve your multiphysics simulation skills, are new to COMSOL Multiphysics and want to advance fast, or want to get inspired by other innovators, then this all-encompassing event is for you. Join us and thousands of other engineers and scientists for the COMSOL Conference 2016 and bring your modeling and product development knowledge to the next level. Read on for more details.


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Caty Fairclough | March 21, 2016

When designing tall, slender truss towers topped with heavy loads, engineers may want to account for buckling. This requires calculating the critical compressive load of the structure at hand. Simulation is a time- and cost-efficient way to generate such results. Now, with simulation apps, this process is becoming even faster. Those without simulation expertise can easily run their own tests to calculate the critical compressive load for different truss tower configurations.


Walter Frei | March 16, 2016

Thermal curing is the process of temperature-induced chemical change in a material, such as the polymerization of a thermoset resin. This process is relevant, for example, when a precursor resin is heated and hardens during the manufacturing of composites. You can often assume that the material does not flow during curing, which simplifies the analysis. Thermal curing is very easy to model within the core functionality of COMSOL Multiphysics, as we will show in this blog post.


Abbie Weingaertner | March 14, 2016

Geothermal heat pumps offer an environmentally friendly option for heating modern, well-insulated homes. Oftentimes, many configurations are explored before deciding on the most effective ground heat recovery system. Simulation tools like COMSOL Multiphysics can be used to analyze different iterations to ensure an optimal final design. With the introduction of easy-to-use simulation apps, such modifications no longer require the skills of a simulation expert. Instead, colleagues can investigate design changes, run their own simulations, and evaluate results.


Walter Frei | March 24, 2016

In today’s blog post, we will introduce a procedure for thermally modeling a material with hysteresis, which means that the melting temperature is different from the solidification temperature. Such behavior can be modeled by introducing a temperature-dependent specific heat function that is different if the material has been heated or cooled past a certain point. We can implement this behavior in COMSOL Multiphysics via the Previous Solution operator and a little bit of equation-based modeling. Let’s find out how…


Walter Frei | March 22, 2016

Whenever you are modeling coils with the AC/DC Module in COMSOL Multiphysics, you need to consider what type of boundary conditions to use to truncate your modeling domain. In this blog post, we will introduce the different boundary conditions that you can use and how to choose between them.


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Fabrice Schlegel | March 17, 2016

When you think of a stout beer, one type that may come to mind is Guinness® beer. This stout is very special, noticeable by its dark body and famous white head. The dynamics of the foam alone are interesting enough to write a series of blog posts about. Although I don’t drink Guinness® beer (I’m a fan of IPA), I found the longstanding debate about whether its bubbles are rising or sinking while the beer settles makes an interesting simulation.


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Linus Andersson | March 15, 2016

Over the 10th through 18th centuries, the sound holes in violins evolved from a circular shape to an elongated f shape. In a recent research paper, MIT scientists and violin makers from the North Bennet Street School in Boston investigated the effects of this change in shape. They suggest that the f-shaped holes increase the air flow, making the bass notes of the violin twice as loud. Today, we will reproduce their findings with COMSOL Multiphysics.


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Cesare Tozzo | March 10, 2016

Characterizing magnetic behavior is crucial when designing magnetic devices involving ferromagnetic materials. Different materials (or the same material after certain processes) can react differently to the same stimulus and improper characterization can cause device failure. COMSOL Multiphysics® software version 5.2 expands the current support for describing magnetic materials and defines access to material models through external routines. Here, we demonstrate how this new functionality works in a case featuring hysteresis and review the current opportunities for modeling ferromagnetic materials.


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