2020 Volume 12 Issue 2 Pages 76-84
Recently, accompanied by the dramatic performance improvement of computers, acoustic analysis has been used for acoustic design inside and outside the room. Up to now, the authors have proposed a large-scale steady-state and non-stationary acoustic analysis method based on the parallel finite element method. The finite element method has the merit that can handle complex shapes such as real problems using a small number of elements, compared to the difference method. However, large-scale analysis with hundreds of millions to 10 billions of degrees of freedom is also required due to the increase in analysis space and increase in analysis frequency. The previous version of all parallel acoustic analysis modules have been developed in a 32-bit environment, which is a constraint for large-scale analyses, and tens of millions of degrees of freedom is the upper limit of the number of degrees of freedom that can be calculated. Therefore, in this research, all parallel acoustic analysis modules consisting of I/O library, domain decomposer, and acoustic analysis solver are newly converted to 64-bit. and the scale is 100 million degrees of freedom, which is unprecedented in the world. As a result, we have realized large-scale analyses with a scale of 100 million degrees of freedom such as the calculation of the head shape transfer function that requires analysis of this scale, and in real world problems such as high-frequency live music club analysis at over 1[kHz], so we report here.
