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563 results on '"Benzi, R."'

151. Large-eddy simulation of buoyant plane plumes

Author

Bastiaans, R.J.M., Doorn, van, E.M., Rindt, C.C.M., Steenhoven, van, A.A., Nieuwstadt, F.T.M., Benzi, R., Energy Technology, and Group Bastiaans

Subjects
Physics::Fluid Dynamics
Abstract

In the present study a turbulent plane plume is examined by means of numerical simulations. Results are compared with experiments and results from integral models based on an entrainment assumption. The objective of this research is to determine wheter a large-eddy simulation can be applied in this case and what subgrid scale model performs best.

Published
1994

158. Universal Intermittent Properties of Particle Trajectories in Highly Turbulent Flows

Author

Arnèodo, A., primary, Benzi, R., additional, Berg, J., additional, Biferale, L., additional, Bodenschatz, E., additional, Busse, A., additional, Calzavarini, E., additional, Castaing, B., additional, Cencini, M., additional, Chevillard, L., additional, Fisher, R. T., additional, Grauer, R., additional, Homann, H., additional, Lamb, D., additional, Lanotte, A. S., additional, Lévèque, E., additional, Lüthi, B., additional, Mann, J., additional, Mordant, N., additional, Müller, W.-C., additional, Ott, S., additional, Ouellette, N. T., additional, Pinton, J.-F., additional, Pope, S. B., additional, Roux, S. G., additional, Toschi, F., additional, Xu, H., additional, and Yeung, P. K., additional

Published
2008
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170. Intermittency and structure functions in channel flow turbulence

Author

Toschi, F., Amati, G., Succi, S., Benzi, R., Piva, R., Toschi, F., Amati, G., Succi, S., Benzi, R., and Piva, R.

Abstract

We present a study of intermittency in a turbulent channel flow. Scaling exponents of longitudinal streamwise structure functions, ¿p/¿3, are used as quantitative indicators of intermittency. We find that near the center of the channel the values of ¿p/¿3 up to p = 7 are consistent with the assumption of homogeneous and isotropic turbulence. Moving towards the boundaries, we observe a growth of intermittency which appears to be related to an intensified presence of ordered vortical structures. We argue that the clear transition in the nature of intermittency appearing in the region close to the wall is related to a new length scale which becomes the relevant one for scaling in high shear flows.

Published
1999

171. Multiscale velocity correlation in turbulence : experiments, numerical simulations, synthetic signals

Author

Benzi, R., Biferale, L., Ruiz-Chavarria, G., Ciliberto, S., Toschi, F., Benzi, R., Biferale, L., Ruiz-Chavarria, G., Ciliberto, S., and Toschi, F.

Abstract

Multiscale correlation functions in high Reynolds number experimental turbulence, numerical simulations, and synthetic signals are investigated. Fusion Rules predictions as they arise from multiplicative, almost uncorrelated, random processes for the energy cascade are tested. Leading and subleading contribution, in the inertial range, can be explained as arising from a multiplicative random process for the energy transfer mechanisms. Two different predictions for correlations involving dissipative observable are also briefly discussed.

Published
1999

172. Intermittency and scaling laws for wall bounded turbulence

Author

Benzi, R., Amati, G., Casciola, C.M., Toschi, F., Piva, R., Benzi, R., Amati, G., Casciola, C.M., Toschi, F., and Piva, R.

Abstract

Well defined scaling laws clearly appear in wall bounded turbulence, very close to the wall, where a distinct violation of the refined Kolmogorov similarity hypothesis (RKSH) occurs together with the simultaneous persistence of scaling laws. A new form of RKSH for the wall region is here proposed in terms of the structure functions of order two which, in physical terms, confirms the prevailing role of the momentum transfer towards the wall in the near wall dynamics.

Published
1999

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