Center for Simulation of Dynamic Response of Materials

Compressible Turbulence

An important component of the research carried out in the VTF facility is the study of the interaction of strong shocks with material interfaces in fluid phases. The modeling and simulation of the resulting inhomogeneous anisotropic turbulence and mix has been a major thrust of the Center’s research program. In the past five years the Center has made important progress in this area via a unique structure-based multiscale approach to turbulence modeling. Achievements include

1. The use of high performance computation to develop a database of direct numerical simulations (DNS) of compressible and incompressible turbulent flows. The resulting databases are and continue to be essential in guiding the development of turbulence and mix models.
2. Development of unique structure-based subgrid scale models (SGS) that, in concert with Large Eddy Simulation (LES), provide models for subgrid scale stresses and mixing.
3. The application of these models to turbulence driven by strong shock waves.
4. Characterization of the geometry of the fluid structures that dominate mixing in high Reynolds number flows. In the second phase we envisage an extension of this multiscale approach to the modeling of detonation and combustion with an emphasis on the mixing in compressible turbulent combustion. However, we will restrict our efforts to gas-phase combustion. The combined application of high performance computation coupled with the Center’s structure-based approach to modeling of compressible turbulence will facilitate a unique capability to
   model mix in strongly driven reacting flows, a capability which to date has frustrated conventional approaches to
   LES.

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