Proceedings

EPJ Plus Highlight - An efficient Lattice-Boltzmann approach for studying compressible flow in nonlinear thermoacoustic engines

Contours of the Mach number near the stack at phase π under the limit cycle.

Thermoacoustics is the physics of the interaction of thermal and acoustic fields. The nonlinear acoustic effect and low Mach number compressible flow in thermoacoustic engines make the theoretical analysis of such systems extremely complicated. A new study investigates the nonlinear self-excited thermoacoustic onset in a Rijke tube via the lattice Boltzmann method (LBM), which simulates the fluid flow by tracking the evolution of particles and obtains flow stream and heat transfer patterns from the kinetic level. The adopted LBM model, which was developed by the authors, convincingly simulates the Navier-Stokes-Fourier equations, treating accurately the nonlinear process of wave excitation of coupled fields and providing reliable estimates for pressure, density, velocity and temperature in such a finite geometry.

A nonlinear self-excited standing wave in the Rijke tube is observed from simulations. Agreement is obtained with theoretical predictions when they exist. Instantaneous velocity fields and temperature fields are discussed. The maximal Mach number in the Rijke tube is about 0.035, indicating that the air flow under the limit cycle is the low Mach number compressible flow.

I have looked at the online proceedings of ISMD14 that you have prepared. I must definitely say that I am even more than fully satisfied with them! This convinces me even more that online proceedings are nowadays much more useful than traditional paper printed copies. They are much more accessible, provide quick access to references and allow readers to easily use the results in terms of plots and tables (...). I have already suggested your online journal to a colleague of mine who has to publish the proceedings of another conference and I will certainly take the opportunity to suggest your services to many more colleagues.

I really appreciated the high level of professionalism of the EDP Sciences staff and I will definitely recommend your online journal to my colleagues.

Paolo Giacomelli and Fabrizio Fabbri, INFN Bologna, Italy
Co-Editors, EPJ Web of Conferences vol. 90, 2015

ISSN: 2100-014X (Electronic Edition)

© EDP Sciences