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WP4 - Compressible solver and grand unification

The common objective of this WP is unification, both from a computational and experimental point of view. A full compressible solver in an ALE framework will be developed (T4.1-2) to account for fluid coupling with dynamic vocal tract and tissue responses, and for the generation of acoustic waves within a unique simulation. The compressible solver will be developed in steps of increasing difficulty, first focusing on the vocal tract and using results from WP2 as inputs, and then incorporating fluid-structure interaction at the vocal folds in T4.3. The compressible approach corresponds to the so-called DNS (Direct Numerical Simulation) of the problem, which is computationally very demanding, even for parallelization implementations in super-computer facilities. While human hearing extends to 20 kHz, it is not clear to which frequency such an approach will be feasible. Consequently, further options will be also considered in T4.3. In particular, acoustic analogies will be implemented to address the full fluid-mechanical-acoustical coupling. This will be done using the incompressible solver (WP2) combined with the acoustic solver (WP5). Geometries will be driven according to the results of WP7. All codes will be parallelised using the DOLFIN/Unicorn framework that has demonstrated optimal strong scaling up to at least 5000 cores on a supercomputer architecture. In parallel, replicas produced in WP3 and WP6 will be united to achieve a full mechanical replica that includes dynamic vocal folds and dynamic vocal tracts. It should be able to generate a syllable and will provide insight in the involved physics, as well as serving for comparison with the unified parallel computations. With such unified codes and replicas, we will attempt the complete simulation of syllables containing fricatives and/or plosives.