Velocity gradient invariants and local flow-field topology in compressible turbulence

abstract

• The effect of compressibility on velocity gradient structure and the related flow-field patterns/topology is investigated using direct numerical simulation data. To clearly isolate compressibility effects, the behavior is investigated as a function of local level of dilatation. Importantly, dilatation-conditioned behavior is found to be independent of Mach and Reynolds numbers. Not surprisingly, at low dilatation level, velocity gradient structure and local flow topology are similar to incompressible turbulence. At high dilatation levels, however, the behavior is quite different. A recently developed velocity gradient evolution equation Homogenized Euler Equation (HEE) qualitatively captures many of the observed features of compressible turbulence. 2010 Taylor & Francis.

authors

• Girimaji, Sharath

published proceedings

• JOURNAL OF TURBULENCE

author list (cited authors)

• Suman, S., & Girimaji, S. S.

citation count

• 70

complete list of authors

• Suman, Sawan||Girimaji, Sharath S

publication date

• January 2010

publisher

• Taylor & Francis  Publisher

published in

• Journal of Turbulence  Journal

keywords

• Compressible Turbulence
• Invariants
• Topology
• Velocity Gradients

Digital Object Identifier (DOI)

• 10.1080/14685241003604751

start page

• 1

end page

• 24

volume

• 11

issue

• 2

URL

• http%3A%2F%2Fdx.doi.org%2F10.1080%2F14685241003604751