Turbulence in Compressible Flows

Purpose and focus of SIG

This SIG replaced in 1992 the previous SIG on "Rotating Compressible Turbulence". Initially, the main goal was to investigate the coupled effects of compression-distortion (compression in the sense of a large variation in mean volume at low Mach numubers), and rotation on turbulence. Special attention was paid to applications concerning reciprocating engines.

With respect to these initial objectives, an important change of orientation was proposed in order to take into account intrinsic compressibility from a more general point of view. Accordingly, the word `rotating' was removed from the title, but some
specific aspects of compressible flows, in the presence of a swirling motion, are still accounted for. This retargeting reflects the increasing interest for compressible high-speed flows in Europe, with a particularly large number of research centres in France.

Each of the three convenors represent a French Pilot Centre within ERCOFTAC and a satistactory balance is preserved between the research areas of each French Centre in this domain.

Intrinsic compressibility strongly affects turbulence and organised structures, with a particular impact on the mixing properties. Applications mainly concern aeronautics and aerospace, especially with respect to hypersonic planes, but high speed flows
with shock waves are commonly encountered nowadays in the domain of engineering.

Compression is also involved in nuclear fusion by inertial confinment and in astrophysics.

Finally `compressed' low Mach number turbulence is concerned in internal combustion engines.

Regarding the large spectrum of flows with variable density, this SIG focusses on speed-induced effects (significant Mach numbers or rapid time variation in mean volume) rather than on temperature or concentration gradients effects. The SIG has been stimulating close collaboration between experimental, theoretical and numerical approaches.

The main topics are recalled below. Compressed turbulence at low Mach number is addressed in the first topic. The second topic focusses on the behaviour of the dilatational part of the turbulent velocity field and interaction with the solenoidal part, mainly in the presence of mean distortion. Topic 3 emphasises more fundamental aspects, using advanced linearised theories (`RDT', Ribner's theory ...), DNS, and background experiments, especially in ONERA and CEAT. The titles of the other topics are sufficiently explicit not to need additional comments.  

1. Turbulent flows under rapidly changing volume
2. Homogeneous compressible turbulence
3. Shock wave-turbulence interaction
4. Turbulence and mixing in high speed flows
5. Instabilities in compressible flows
6. Advanced experimental methods for compressible flows

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