Algebraic growth in a Blasius boundary layer: Nonlinear optimal disturbances
نویسندگان
چکیده
منابع مشابه
Algebraic growth in a Blasius boundary layer: Nonlinear optimal disturbances
The three-dimensional, algebraically growing instability of a Blasius boundary layer is studied in the nonlinear regime, employing a nonparallel model based on boundary layer scalings. Adjoint-based optimization is used to determine the “optimal” steady leading-edge excitation that provides the maximum energy growth for a given initial energy. Like in the linear case, the largest transient grow...
متن کاملReceptivity and Growth of Two- and Three-Dimensional Disturbances in a Blasius Boundary Layer
In this experimental study, acoustic receptivity was examined for a Blasius boundary layer formed on a flat plate. Non-localized surface roughness, 2-D and oblique, were considered for various roughness heights and acoustic wave amplitudes. The receptivity sites (surface roughness) had a well defined wavenumber spectrum with a fundamental wavenumber of kw. A planar downstream-traveling acoustic...
متن کاملInstability of streaky structure in a Blasius boundary layer
An experimental study was performed to analyze the stability of localized streaky structure in a Blasius boundary layer. An artificial streaky structure was created by using suction or blowing through a thin spanwise slot at the wall. The velocity gradient generated by the suction or blowing was controlled by a damper. The Reynolds number based on the displacement thickness d1 was Red1 =280 at ...
متن کاملNon-localized acoustic receptivity and subsequent disturbance growth in a Blasius boundary layer
Acoustic receptivity was experimentally examined for a Blasius boundary layer with receptivity sites in the form of 2-D waviness and oblique waviness. Linear receptivity coe cients obtained for all values of forcing combinations ( h) are in good agreement with receptivity theory. The measured receptivity increased markedly with increasing wave obliqueness. Detuning was investigated by varying t...
متن کاملNumerical studies of bypass transition in the Blasius boundary layer
Experimental findings show that transition from laminar to turbulent flow may occur also if the exponentially growing perturbations, eigensolutions to the linearised disturbance equations, are damped. An alternative non-modal growth mechanism has been recently identified, also based on the linear approximation. This consists of the transient growth of streamwise elongated disturbances, with reg...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: European Journal of Mechanics - B/Fluids
سال: 2006
ISSN: 0997-7546
DOI: 10.1016/j.euromechflu.2005.07.001