# Welcome!

*Thank you* for visiting the focal point of aeroacoustics and multi-physics simulation and optimization at the University of Illinois at Urbana-Champaign. Use the navigation bar on your left to guide you around the site.

## Top News Items

- Ostoich, Bodony, and Geubelle
**receive the AIAA Best Paper Award from the Fluid Dynamics Technical Committee**for our AIAA Conference Paper “Direct numerical simulation of the aeroelastic response of a panel under high speed turbulent boundary layers,” AIAA Paper 2013-3200, Presented at the 43rd Fluid Dynamics Conference, San Diego, CA, 24-27 June, 2013. - Bodony becomes Associate Editor of the Journal
*Theoretical and Computational Fluid Dynamics* - Welcome Mr. Cory Mikida into our group!
- Congratulations to
**Qi Zhang**for passing his PhD defense! - Zhang's simulation of a jet-in-crossflow for the DOE PSAAP2 Center featured on the SSAP Annual Report.

More news is available here.

## What is “Aeroacoustics”?

*Aeroacoustics* is centrally concerned with the generation and propagation of sound through a fluid. The prefix *aero* implies air, but one can also include sound in other fluids, such as water (also called hydroacoustics). Aeroacoustics is part of the broader topic of acoustics, the latter of which can include sound propagation through other types of media, including solids, plasmas, etc. Our research is primarily concerned with the generation, propagation, and minimization of sound produced by engineering and biological systems.

Through a combination of theory and computation we analyze complex systems from a physics-based perspective, usually solving the two- or three-dimensional compressible Navier-Stokes equations directly. Current aeroacoustic research projects include the prediction and reduction of supersonic jet noise, the radiation of sound by compliant structures, the prediction of the human voice, absorption of sound by acoustic liners, and the generation of sound by heated gas interacting with a high pressure turbine row.

Mach 2.25 turbulent boundarylayer interacting

with a flexible panel.

## What is “Multi-Physics Simulation and Optimization”?

*Multi-physics* systems are characterized as having regions with differing dynamics. In aerospace engineering applications, for example, a typical system might be composed of a fluid domain adjacent to a solid domain. What is most critical, however, is that the different domains are *coupled* together such that the dynamics of each domain depends on the dynamics of all of the other domains. Aeroelasticity is probably the most well known example. Our research approaches multi-physics problems from a “continuum, first principles” perspective where we solve the underlying continuum equations of motion accurately and pass traction (force), heat flux, and boundary motion between the individual domains. In doing so we solve the conservation equations for fluid and solid domains concurrently to yield the motion of the coupled system. Recent work focuses on performing adjoint-based optimization in a multi-physics context.