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September 27, 2019

Back in December 2017 COMSOL released version 5.3a of Multiphysics. I used the software on a so-called Head And Torso Simulator, HATS for short, using COMSOL's newly implemented, and highly requested, Boundary Element Method for acoustics. I had tested it in an early version (https://www.a...

August 10, 2019

In this blog post I will show how an evanescent acoustic mode can be turned into a propagating mode via acoustic topology optimization.

For a circular cylindrical tube the so-called (0,1) mode has symmetry along the circumference of the tube, and one nodal line along the radius. Above a certain frequ...

May 19, 2019

In this post we will have a look at modes for zero-dimensional systems, and how to relate eigenvalue/eigenvector analysis to more standard analyses of such systems, and how resonance comes into play in the whole thing.


Certain systems can be described as being zero-dimensional. When this...

January 22, 2019

I think the concept of ‘modes’ is often misunderstood. I certainly have been confused at times (and sometimes I still am). I think some of the confusion comes from textbooks, and blog posts, not being concise enough in their description, and also that the concepts are introduced differently in diffe...

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#029: HATS and the Boundary Element Method

September 27, 2019

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