Studying Shock Wave Phenomena with a Shock Tube Application

Xavier Corbella Coll December 10, 2018

Until the early 1900s, shock waves were an academic problem studied from a theoretical point of view only. Many great scientists, including Lord Rayleigh, worked on the field until the theory of inviscid shock waves was established in the 1920s. During World War II, this theory started to be applied, mostly to supersonic vehicles. To study shock waves, one important gas dynamic instrument is the shock tube, which is used to test supersonic and hypersonic flows and high-temperature gases.

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Thomas Forrister August 17, 2018

“If you want to find the secrets of the universe, think in terms of energy, frequency, and vibration.” — Nikola Tesla Can we “see” sound? Not directly, but we can come close. By changing our perspective, we can learn a lot about the nature of acoustics. One way to observe acoustics phenomena is by studying standing waves in a solid medium known as a Chladni plate. A special technique creates patterns on the plate that reveal sound’s physical nature.

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Caty Fairclough April 27, 2018

Picture a classroom filled with students. At the front, a teacher discusses room acoustics, including the underlying theories and acoustics phenomena involved. To help students visualize these concepts, the teacher has created a simulation app. This app, which is accessible through a web browser, enables students to dynamically alter parameters and see the results, creating a vivid learning experience. At the Technical University of Munich (TUM), several such apps are already being used, providing benefits to teachers and students alike…

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Bridget Paulus February 15, 2018

The interference fit between two parts has to be just right. Think of it as the Goldilocks quandary of structural mechanics: if the fit is too loose, the parts won’t hold together; if it’s too tight, the parts can’t join. For optimal performance of a structure involving joined parts, the interference fit needs to be calculated. One method is to create a simulation app, which can efficiently compute the contact pressure and surface displacement of two joined parts.

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Fanny Griesmer 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.

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Bridget Cunningham August 3, 2017

There are many ways to improve the frequency response of frequency-selective surfaces. However, optimizing these structures can require multiple steps. Every change to a design parameter — unit cell type, polarization, substrate properties, etc. — needs the expertise of simulation engineers. Simulation apps enable those with little or no simulation experience to run analyses for their specific stage of the design process on their own.

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Annette Pahl July 5, 2017

Plasma modeling normally requires knowing the electron energy distribution function (EEDF) as well as transport properties like electron mobility and diffusivity. To accurately calculate these quantities with the Boltzmann equation, we must also know the electron density (and possibly the density of all species subject to electron impact reactions). However, the electron (and species densities) are outputs of a plasma model, resulting in a catch-22. Let’s take a look at how to overcome this challenge using an example app.

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Temesgen Kindo June 28, 2017

You solved a model under certain assumptions. When you analyze the results, you find out that those assumptions do not hold. Now, you have to amend your analysis by incorporating new physics features or changing the study type. What if you could automate such processes? Today, we will discuss how to do so easily using the Model Method feature introduced in version 5.3 of the COMSOL Multiphysics® software.

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Walter Frei June 5, 2017

Have you ever wanted to include a randomly created geometry in your model? Perhaps you want to simulate a natural material or an arrangement of parts that has some known statistical distribution of dimensional variations. In such cases, we may want to create a random geometry in the COMSOL Multiphysics® software. With the release of version 5.3, we can now create random geometries using a method. Let’s take a look at how to do so with a tasty example.

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Chien Liu May 31, 2017

You can use the new Schrödinger Equation interface for modeling with the Semiconductor Module in the latest release of the COMSOL® software. Let’s look at a simple example app that uses this interface to estimate the electron and hole ground state energy levels for a superlattice structure. By building apps like this one, device engineers are able to calculate the band gap for a given periodic structure and adjust the design parameters until a desired band gap value is achieved.

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Caty Fairclough May 29, 2017

When designing a solar dish receiver, you may need to rerun your simulation multiple times to find an optimized design iteration. To save time, you can build an app that enables you to rapidly test different geometries and more easily create improved designs. Let’s explore a new simulation app in COMSOL Multiphysics® version 5.3, the Solar Dish Receiver Designer, which you can use as inspiration for building apps of your own.

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