Nonlocal modulation of the energy cascade in broadband-forced turbulence

Share/Save/Bookmark

Kuczaj, Arkadiusz K. and Geurts, Bernard J. and McComb, W. David (2006) Nonlocal modulation of the energy cascade in broadband-forced turbulence. Physical Review E: Statistical, nonlinear, and soft matter physics, 74 (1). 016306. ISSN 1539-3755

open access
[img]
Preview
PDF
782kB
Abstract:Classically, large-scale forced turbulence is characterized by a transfer of energy from large to small scales via nonlinear interactions. We have investigated the changes in this energy transfer process in broadband forced turbulence where an additional perturbation of flow at smaller scales is introduced. The modulation of the energy dynamics via the introduction of forcing at smaller scales occurs not only in the forced region but also in a broad range of length scales outside the forced bands due to nonlocal triad interactions. Broadband forcing changes the energy distribution and energy transfer function in a characteristic manner leading to a significant modulation of the turbulence. We studied the changes in this transfer of energy when changing the strength and location of the small-scale forcing support. The energy content in the larger scales was observed to decrease, while the energy transport power for scales in between the large and small scale forcing regions was enhanced. This was investigated further in terms of the detailed transfer function between the triad contributions and observing the long-time statistics of the flow. The energy is transferred toward smaller scales not only by wave numbers of similar size as in the case of large-scale forced turbulence, but by a much wider extent of scales that can be externally controlled.
Item Type:Article
Copyright:© 2006 American Physical Society
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/59078
Official URL:http://dx.doi.org/10.1103/PhysRevE.74.016306
Publisher URL:http://link.aps.org/abstract/PRE/v74/e016306
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 238216