Linear Acoustics 2: Cat's eye

<p>This benchmark problem consists of&nbsp; a vibrating surface, which coincides with the spherical one. The plain surfaces of the missing octant are assigned a zero admittance. Thereby, the radiator allows construction of a smooth solution that will make it easy to identify solution failures caused by the ill&ndash;conditioning of the integral operator for techniques that solve the Helmholtz equation in an integral formulation, i.e. the irregular frequencies. Furthermore, the cat&rsquo;s eye structure is a more complicated shape than a sphere and hence, the solution is expected to expose more irregular frequencies in a BEM solution than the sphere.</p> <p>A detailed description with references can be found in the PDF description.</p> <p><strong>Available solutions:</strong></p> <p>Steffen Marburg&#39;s solution using the Boundary Element Method:&nbsp;LA_Case2_CatEye_SteffenMarburg.pdf</p>