## How to Use the Parameter Estimation Study Step for Inverse Modeling

##### Amelia Halliday March 29, 2018

When creating a simulation, you usually start by building the forward model, supplying various inputs, and then looking at the results. However, what if you have a set of results and want to find the input values that provide the same outcome? Here, we show how to use the Parameter Estimation study step, which helps you build an inverse model and solve for the optimal values of your model inputs.

Ler Mais##### Brianne Costa March 27, 2018

In early 2018, the northeast coast of the U.S. was hit with three major winter storms (locals “lovingly” call them nor’easters) all in a matter of weeks. Cape Cod in Massachusetts faced especially severe coastal erosion that damaged many homes and businesses. After one of the storms, residents surveyed the aftermath and noticed something interesting…

Ler Mais##### Ed Fontes March 26, 2018

The algebraic multigrid (AMG) solver provides robust solutions for large CFD simulations. Available as of version 5.3a of the COMSOL Multiphysics® software, the AMG method only requires one mesh, in contrast to the geometric multigrid (GMG) solver, which requires at least one extra coarser mesh. This eliminates the hassle associated with creating coarse meshes for complex geometries with small details that are difficult to mesh unless a fine mesh is used.

Ler Mais##### Thomas Forrister March 23, 2018

Pierre-Simon Laplace was a French physicist who made many contributions to mathematics and astronomy and is best known for demonstrating the stability of our solar system. Sometimes referred to as “the French Sir Isaac Newton”, Laplace confirmed Newton’s theory of gravitation by applying it to planetary orbits. Many of his formulas are still used by physicists today.

Ler Mais##### Thomas Forrister March 22, 2018

In the 1970s and 80s, music fans would dedicate entire rooms of their homes to stereo systems. Big, boxy loudspeakers were essential fixtures of these stereo setups. Today, a new trend has emerged: Consumers want loudspeakers that are both powerful and portable, with the ability to connect to devices around the house and on the go. To design sophisticated yet lightweight loudspeakers, you can optimize the topology of their components, such as a magnetic circuit for the loudspeaker driver.

Ler Mais##### Brianne Costa March 21, 2018

Pablo Rolandi from Amgen delivered a keynote presentation at the COMSOL Conference 2017 Boston. The topic? How Amgen is moving beyond modeling and simulation for biopharma development. Rolandi shared five examples that illustrate this idea across both biologic and synthetic medicine applications. If you missed his presentation, you can watch a recording of the video and read the highlights of what he discussed here.

Ler Mais##### Hanna Gothäll March 20, 2018

We have already discussed different ways to create geometry objects of irregular shapes on the blog. In this blog post, we will demonstrate an incredibly powerful alternative approach by using interpolation functions. Instead of creating geometry objects, we will indirectly define the irregular shape by taking advantage of the spatial variation of a material property in the object we want to study.

Ler Mais##### Mads Herring Jensen March 19, 2018

The boundary element method (BEM) is included in the Acoustics Module as a physics interface. This interface, available as of version 5.3a of the COMSOL Multiphysics® software, can be seamlessly combined with interfaces based on the finite element method (FEM) to model, for example, acoustic-structure interaction problems. This functionality expands the range of problems that can be solved with the Acoustics Module. Here, we look into the BEM functionality, examples, and BEM-specific postprocessing.

Ler Mais##### Nicolas Huc March 15, 2018

Nonisothermal flow combines CFD and heat transfer analysis. In cases where the temperature of the fluid at an inlet is a known quantity, a Temperature boundary condition can be used. However, there are some important situations where this is not the case, and an Inflow boundary condition can improve the model accuracy and reduce the computational cost of the simulation. Here, we review how this more sophisticated thermal boundary condition can be set at a flow inlet.

Ler Mais##### Jenn Nguyen March 14, 2018

“The important thing is to not stop questioning. Curiosity has its own reason for existing.” –Albert Einstein A passionate and curious intellectual, Albert Einstein is considered one of the most influential physicists of the 20th century. The German-born mathematician and physicist made numerous discoveries throughout his lifetime. Most notably, he developed the special and general theories of relativity. For discovering the law of the photoelectric effect, he earned a Nobel Prize in Physics in 1921.

Ler Mais##### Guest Mandar Gadgil March 12, 2018

Guest blogger Mandar Gadgil of Noumenon Multiphysics discusses modeling phase change in a thermosiphon. Thermosiphons have been used for keeping houses warm since the 1800s. These devices use central heaters and pipe networks that carry water and steam to different rooms. The cool part (figuratively) is that no pump is needed for fluid transport — convective currents induced by the heater located at the bottom of an installation are enough. Let’s discuss modeling thermosiphons using a “pseudofluid” with temperature-dependent properties.

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