On the stability of flat plate boundary layers subject to localized suction
2015 (English)Report (Other academic)
The stability of the Blasius boundary layer subject to localized suction is revisited. Using tools of global stability analysis, the leading direct and adjoint eigenpairs are determined, and novel insight into the sensitivity and receptivity of the flow is obtained. The problem is addressed through high-order spectral element simulations, which enables the inclusion of a suction pipe into the domain. Due to this, a detailed investigation of the connection between the pipe flow and the boundary layer flow is possible. For all cases investigated, the former always turns out to transition for a lower Reynolds number and suction rate than the latter, and the transition scenario is found to be due to a global instability originating inside a separation bubble at the pipe inlet. Identification of such regions, provides information that is valuable in further development of algorithms for laminar flow control.
Place, publisher, year, edition, pages
2015. , 20 p.
Fluid Mechanics and Acoustics Aerospace Engineering
Research subject Aerospace Engineering; Engineering Mechanics
IdentifiersURN: urn:nbn:se:kth:diva-175350OAI: oai:DiVA.org:kth-175350DiVA: diva2:860461
QC 201510152015-10-122015-10-122015-10-15Bibliographically approved