AUTHOR=Benad Justus 

TITLE=Calculation of the BEM Integrals on a Variable Grid With the FFT

JOURNAL=Frontiers in Mechanical Engineering

VOLUME=6

YEAR=2020

URL=https://www.frontiersin.org/journals/mechanical-engineering/articles/10.3389/fmech.2020.00032

DOI=10.3389/fmech.2020.00032

ISSN=2297-3079

ABSTRACT=<p>In this study, an exemplary application of the <italic>pFFT</italic> is shown for the 2D Navier equation for a linear elastic continuum. Using this example, it is illustrated how the <italic>pFFT</italic> might be extended in order to decrease the computational complexity of the method. In the standard <italic>pFFT</italic> approach, all panel influences which are not calculated directly are obtained using a single regular grid. In the present study, a variable gird is suggested to obtain these influences. It is outlined how it is possible to apply the FFT on each level of this variable grid by rearranging segments of the shape boundary. A brief example is presented which indicates feasibility of the concept.</p>