Predicting the Sound Emission of a Muffler Design via Simulation

Guest Linus Fagerberg September 14, 2017

Guest blogger Linus Fagerberg from Lightness by Design returns to share a novel approach for predicting external noise generation in muffler designs. In recent years, the European Union has introduced stricter noise emission limits for road vehicles. For those designing mufflers, these limits make it important to create more efficient ways of developing and assessing the performance of their designs. At Lightness by Design, we’ve developed a novel approach that accomplishes this goal.

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Phillip Oberdorfer September 6, 2017

When simulating heat transfer in fluids with forced convection, we can often neglect the influence of temperature variations on the flow field unless the requirements on accuracy are very high. Computing the flow field independently might substantially decrease the computational cost with a negligible impact on accuracy in the solution. In this blog post, we demonstrate the advantages of using a one-way coupling in the COMSOL Multiphysics® software with a nonisothermal flow example.

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Guest Thomas Clavet August 31, 2017

Today, guest blogger Thomas Clavet of EMC3 Consulting, a COMSOL Certified Consultant, discusses simulating phased array and geometrically focused probes. Ultrasound focusing is widely used in various industrial applications, such as nondestructive testing (NDT) and medical imaging. For clinical applications, high-intensity focused ultrasound (HIFU) is a specific aspect of this technology where most of the power provided by the probe is carried to a targeted zone to coagulate biological tissues. This blog post discusses ultrasound focusing simulation.

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Ruud Börger August 22, 2017

Have you ever feared a deadline because your model took longer to solve than expected? Here, we discuss common causes of time delays and how to prevent them. Let’s start with a real-world example: solving a complex modeling project on a deadline.

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Nancy Bannach August 21, 2017

As of version 5.3 of the COMSOL Multiphysics® software, the Subsurface Flow Module includes useful new features that enable you to set up complex modeling tasks more efficiently. For example, when modeling wells, meshing is significantly easier and is more intuitive to set up with the Well feature. In this blog post, we look at the Well feature, discussing how to use it and ways it enhances the modeling process.

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Magnus Ringh August 17, 2017

During sunny days, it’s tempting to bring food and drinks outside to enjoy the weather. However, it can be a challenge to keep wine (or any beverage) cold in the heat. Wine coolers supposedly keep chilled beverages cold for at least an hour. In this blog post, we use the COMSOL Multiphysics® software to see how a wine cooler works and whether or not it can keep drinks cool.

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Siva Sashank Tholeti August 10, 2017

Have you ever been curious about how to model supersonic flows, like those around Concorde or fighter jets? Generally, this process requires the resolution of shocks or expansion fans in the flow. Resolving discontinuities (e.g., shock waves) requires a high resolution and the numerical stability of strongly coupled mass, momentum, and energy conservation equations for fluid flow. Let’s discuss how to model supersonic flow past a diamond airfoil, which involves resolving shocks and expansion fans.

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Bjorn Sjodin August 8, 2017

The latest version of the AC/DC Module enables you to create electrostatics models that combine wires, surfaces, and solids. The technology is known as the boundary element method and can be used on its own or in combination with finite-element-method-based modeling. In this blog post, let’s see how the new functionality can be used to conveniently set up a model that includes a number of very thin spiral wires.

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Andrew Griesmer July 27, 2017

Have you ever tried to plot multiple quantities on one graph, only to realize that the scales don’t match up? You can solve this problem by adding a second y-axis to your 1D plot to include two scales of values. In the video below, we introduce a case where you would want two y-axes. We then show you how to add a second y-axis to your graph and create helpful annotations in the COMSOL Multiphysics® software.

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Peter Yakubenko July 26, 2017

Many elongated structures can be modeled effectively using 2D representations of their cross sections. A typical assumption is the plane strain approximation, which implies that all out-of-plane strain components are zero. This assumption is valid when the out-of-plane deformation is restrained; for example, when the ends of the structure are fixed. However, in many cases, the structure is free to expand in the out-of-plane direction. Let’s discuss how to model this case, which is sometimes called generalized plane strain.

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Mads Herring Jensen July 25, 2017

Detailed modeling of the complex interaction of flow and acoustics is achieved in the COMSOL Multiphysics® software and add-on Acoustics Module using the linearized Navier-Stokes interfaces. With the release of version 5.3, the capabilities were further extended with the addition of a new stabilization scheme. This allows robust simulations of systems with acoustic properties that are modified by or depend on a turbulent background flow; e.g., automotive exhaust systems. Here, we introduce important modeling concepts and present application examples.

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