  Many numerical simulation tools have been developed and are on the market,
but there is still a strong need for appropriate tools capable to simulate
multi-field problems, especially in aeroacoustics. Therefore, openCFS provides
an open-source framework for implementing partial differential equations using
the finite element method. Since 2000, the software has been developed
continuously. The result of is openCFS (before 2020 known as CFS++ Coupled
Field Simulations written in C++). In this paper, we present for the first time
the CFS-Data, the open-source pre-post-processing part of openCFS with a focus
on the aeroacoustic source computation (called filters).
