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Secondary Instabilities in Incompressible Axisymmetric Boundary Layers: Effect of Transverse Curvature
- Source :
- IndraStra Global.
- Publication Year :
- 2012
- Publisher :
- American Society of Mechanical Engineers (ASME), 2012.
-
Abstract
- The secondary instability of the incompressible boundary layer in the axial flow past a cylinder is studied. The laminar flow is shown to be always stable at high transverse curvatures to secondary disturbances. Because the primary mode is stable as well, (Tutty , 2002, “Boundary Layer Flow on a Long Thin Cylinder,”. Phys. Fluids, 14 (2), pp. 628–637), this implies that the boundary layer on a thin long cylinder may undergo transition to turbulence by means very different from that on a flat plate. The azimuthal wavenumber of the least stable secondary modes (m±) are related to that of the primary (n) by m+ = 2n and m− = −n. The base flow is shown to be inviscidly stable at any curvature.<br />by Vinod Narayanan and Rama Govindarajan
- Subjects :
- Physics
Flow past a cylinder
Mechanical Engineering
Boundary layer control
Laminar flow
Mechanics
Baseflows
Boundary layer thickness
Curvature
External flow
Transition to turbulence
Physics::Fluid Dynamics
Boundary layer
Classical mechanics
Flat plate
Blasius boundary layer
Transverse curvature
Wave numbers
Potential flow around a circular cylinder
Long thin cylinders
Secondary instability
Subjects
Details
- Language :
- English
- ISSN :
- 23813652
- Database :
- OpenAIRE
- Journal :
- IndraStra Global
- Accession number :
- edsair.doi.dedup.....4ddceeeb68b12fd763eed28f367f95db