===== Lattice Boltzmann Modeling of Acoustic Systems ===== **Participants:** Shi Yong, Andrey da Silva and Gary Scavone **Period:** 2005 - ongoing ---- ==== Summary ==== The mechanisms of sound production in single-reed woodwind instruments are not yet fully understood. Rather than being simply explained by the coupling between the reed and the acoustic field within the bore, the characteristics of the sound seem to be strongly influenced by phenomena associated with the presence of the airflow driven by the player into the instrument. The flow-induced excitation of the reed appears to be a major occurrence among the list of flow-related phenomena. Unlike the case of the larynx in the human phonatory system, the flow-induced oscillation of the reed is not a predominant factor on the process of self-sustained oscillation but plays an important role in the characteristics of sound. Furthermore, the unsteadiness of the downstream flow in normal playing conditions is another flow-related phenomenon, which acts as a major factor on the nonlinear dissipation of the acoustic energy within the instrument's bore and on the instrument's radiation directivity. The goal of this research is to conduct numerical studies of the above-mentioned phenomena in order to provide a deeper understanding of the mechanisms responsible for the sound quality of woodwind instruments. These numerical models are constructed by using the lattice Boltzmann method, which has the advantage of providing integrated solutions for the different scales associated with the acoustic field and the flow, thus allowing the representation of the fluid-acoustic interaction. * {{:projects:lbm_reedchannelarea_animations.zip|Animations of reed channel area}} * {{:projects:sim5._u.mp4.zip|Animation of the whole dynamic clarinet (velocity field, 10MB)}} ---- ==== Publications ==== * Shi Yong, {{:publications:phd_shi_2016.pdf|"A Numerical Framework for Fluid-Acoustic-Structure Interaction in Clarinet-like Instruments."}} Ph.D. thesis, McGill University, 2016. [16.9 MB] * Shi, Y., da Silva, A. and Scavone, G. {{:publications:vt2015_shi.pdf|"LBM Simulation of the quasi-static flow in a clarinet."}} In //Proceedings of the Third Vienna Talk on Music Acoustics//, 16-19 September, Vienna, Austria, p. 35-42, 2015. * Shi, Y., da Silva, A. and Scavone, G. (2013) [[http://iopscience.iop.org/article/10.1088/1751-8113/46/31/315501|"Lattice Boltzmann simulations of sound directivity of a cylindrical pipe with mean flow."]] //Journal of Physics A: Mathematical and Theoretical//, Vol. 46, ISBN: 1751-8113, 315501 (13pp). * Shi, Y., da Silva, A. and Scavone, G. {{:publications:isma2014_shi.pdf|"Numerical Simulation of Whistles Using Lattice Boltzmann Methods."}} In //Proceedings of the 2014 International Symposium on Musical Acoustics//, Le Mans, France, 7-11 July, pp. 615-621, 2014. * Shi, Y., da Silva, A., and Scavone, G. {{:publications:smac2013_shi.pdf|"Numerical analysis of the mean flow effect on the sound directivity pattern of cylindrical ducts."}} In //Proceedings of the Stockholm Musical Acoustics Conference//, Stockholm, Sweden, pp. 458-464, 2013. * da Silva, A., Shi, Y. and Scavone, G. {{:publications:ica2013_dasilva.pdf|"Computational analysis of the dynamic flow in single-reed woodwind instruments."}} In //Proceedings of the International Congress on Acoustics//, Montreal, Canada, 2013. * da Silva, A., Scavone, G., and Lenzi, A. (2010). [[http://www.ingentaconnect.com/content/dav/aaua/2010/00000096/00000005/art00018|"Numerical investigation of the mean flow effect on the acoustic reflection at the open end of clarinet-like instruments."]] //Acta Acustica united with Acustica//, Vol. 96, No. 5, pp. 959-966. * Andrey da Silva, {{:publications:phd_dasilva_2008.pdf|"Numerical Studies of Aeroacoustic Aspects of Wind Instruments."}} Ph.D. thesis, McGill University, 2008. [3.8 MB] * da Silva, A., Scavone, G., and Lefebvre, A. (2009). [[http://www.sciencedirect.com/science/article/pii/S0022460X09005495|"Sound reflection at the open end of axisymmetric ducts issuing a subsonic mean flow: A numerical study."]] //Journal of Sound and Vibration//, Vol. 327, pp. 507-528. * da Silva, A., Scavone, G. and van Walstijn, M. (2007) [[http://asa.scitation.org/doi/full/10.1121/1.2759166|"Numerical simulations of fluid-structure interactions in single-reed mouthpieces."]] //Journal of the Acoustical Society of America//, Vol. 122, pp. 1798-1810. * da Silva, A. and Scavone, G. (2007) [[http://iopscience.iop.org/article/10.1088/1751-8113/40/3/004/meta|"Lattice Boltzmann simulations of the acoustic radiation from waveguides."]] //Journal of Physics A: Mathematical and Theoretical//, Vol. 40, pp. 397-408. * da Silva, A. and Scavone, G. "Coupling Lattice Boltzmann Models to Digital Waveguides for Wind Instrument Simulations." In Proceedings of the 2007 International Symposium on Musical Acoustics, Barcelona, Spain, September 2007. * da Silva, A., Kuehnelt, H. and Scavone, G. "A Brief Survey of the Lattice Boltzmann Method in Musical Acoustics." In Proceedings of the 19th International Congress on Acoustics, Madrid, Spain, September 2007. * da Silva, A. and Scavone, G. "Characterizing Impedance of Woodwind Intruments with the Lattice-Boltzamnn Method," In Proceedings of the 2005 Brazilian Symposium of Computer Music (SBCM), Belo Horizonte, October, 2005. * da Silva, A. and Scavone, G. (2008). [[http://asa.scitation.org/doi/abs/10.1121/1.2934263|"The influence of the mean flow on the transmission properties of wind instruments (A)."]] //Journal of the Acoustical Soc. of America//, Vol. 123, p. 3447. * da Silva, A. and Scavone, G. (2007). [[http://asa.scitation.org/doi/abs/10.1121/1.2942897|"The influence of the acoustic feedback on the fluid-structure interaction within single-reed mouthpieces: A numerical investigation (A)."]] //Journal of the Acoustical Soc. of America//, Vol. 122, p. 3056. * da Silva, A. and Scavone, G. (2006). [[http://asa.scitation.org/doi/abs/10.1121/1.4781502|"A hybrid approach for simulating clarinetlike systems involving the lattice Boltzmann method and a finite difference scheme (A)."]] //Journal of the Acoustical Soc. of America//, Vol. 120, p. 3362, invited presentation. * da Silva, A., Depalle, P. and Scavone, G. (2006). [[http://asa.scitation.org/doi/abs/10.1121/1.4786618|"Benchmarking the lattice Boltzmann method for the determination of acoustic impedances of axisymmetric waveguides (A)."]] //Journal of the Acoustical Soc. of America//, Vol. 119, p. 3383. ----