Mastering nonlinear flow dynamics for laminar flow control

A laminar flow control technique based on spanwise mean velocity gradients (SVGs) has recently proven successful in delaying transition in boundary layers. Here we take advantage of a well-known nonlinear effect, namely, the interaction of two oblique waves at high amplitude, to produce spanwise mea...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. E 2016-08, Vol.94 (2-1), p.021103-021103, Article 021103
Main Authors: Sattarzadeh, Sohrab S, Fransson, Jens H M
Format: Article
Language:English
Subjects:
Boundary-Layer-Transition
Stability
Stabilization
Streaks
Waves
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A laminar flow control technique based on spanwise mean velocity gradients (SVGs) has recently proven successful in delaying transition in boundary layers. Here we take advantage of a well-known nonlinear effect, namely, the interaction of two oblique waves at high amplitude, to produce spanwise mean velocity variations. Against common belief we are able to fully master the first stage of this nonlinear interaction to generate steady and stable streamwise streaks, which in turn trigger the SVG method. Our experimental results show that the region of laminar flow can be extended by up to 230%.
ISSN:2470-0045
2470-0053
DOI:10.1103/PhysRevE.94.021103