The influence of initial conditions on turbulent mixing due to Richtmyer-Meshkov instability
| dc.contributor.author | Thornber, Ben | - |
| dc.contributor.author | Drikakis, Dimitris | - |
| dc.contributor.author | Youngs, D. L. | - |
| dc.contributor.author | Williams, R. J. R. | - |
| dc.date.accessioned | 2012-03-21T23:02:41Z | |
| dc.date.available | 2012-03-21T23:02:41Z | |
| dc.date.issued | 2010-07-10T00:00:00Z | - |
| dc.description.abstract | This paper investigates the influence of different three-dimensional multi-mode initial conditions on the rate of growth of a mixing layer initiated via a Richtmyer-Meshkov instability through a series of well-controlled numerical experiments. Results are presented for large-eddy simulation of narrowband and broadband perturbations at grid resolutions up to 3 x 10(9) points using two completely different numerical methods, and comparisons are made with theory and experiment. It is shown that the mixing-layer growth is strongly dependent on initial conditions, the narrowband case giving, a power-law exponent theta approximate to 0.26 at low Atwood and theta approximate to 0.3 at high Atwood numbers. The broadband case uses a perturbation power spectrum of the form P(k) proportional to k(-2) with a proposed theoretical growth rate of theta = 2/3. The numerical results confirm this; however, they highlight the necessity of a very fine grid to capture an appropriately broad range of initial scales. In addition, an analysis of the kinetic energy decay rates, fluctuating kinetic energy spectra, plane-averaged volume fraction profiles and mixing parameters is presented for each case. | en_UK |
| dc.identifier.citation | Ben Thornber, Dimitris Drikakis, D. L. Youngs, R. J. R. Williams. The influence of initial conditions on turbulent mixing due to Richtmyer-Meshkov instability. Journal of Fluid Mechanics, Vol. 654, July 2010, pp99-139 | |
| dc.identifier.issn | 0022-1120 | - |
| dc.identifier.uri | http://dx.doi.org/10.1017/S0022112010000492 | - |
| dc.identifier.uri | http://dspace.lib.cranfield.ac.uk/handle/1826/7067 | |
| dc.language.iso | en_UK | - |
| dc.publisher | Cambridge University Press | en_UK |
| dc.subject | rayleigh-taylor instability large-eddy simulation high-resolution methods high- order homogeneous turbulence numerical-simulation compressible flows shock-wave acceleration driven | en_UK |
| dc.title | The influence of initial conditions on turbulent mixing due to Richtmyer-Meshkov instability | en_UK |
| dc.type | Article | - |