TY - JOUR
T1 - Three-dimensional capillary waves due to a submerged source with small surface tension
AU - Lustri, Christopher J.
AU - Pethiyagoda, Ravindra
AU - Chapman, S. Jonathan
PY - 2019/3/25
Y1 - 2019/3/25
N2 - Steady and unsteady linearised flow past a submerged source are studied in the small-surface-tension limit, in the absence of gravitational effects. The free-surface capillary waves generated are exponentially small in the surface tension, and are determined using the theory of exponential asymptotics. In the steady problem, capillary waves are found to extend upstream from the source, switching on across curves on the free surface known as Stokes lines. Asymptotic predictions are compared with computational solutions for the position of the free surface. In the unsteady problem, transient effects cause the solution to display more complicated asymptotic behaviour, such as higher-order Stokes lines. The theory of exponential asymptotics is applied to show how the capillary waves evolve over time, and eventually tend to the steady solution.
AB - Steady and unsteady linearised flow past a submerged source are studied in the small-surface-tension limit, in the absence of gravitational effects. The free-surface capillary waves generated are exponentially small in the surface tension, and are determined using the theory of exponential asymptotics. In the steady problem, capillary waves are found to extend upstream from the source, switching on across curves on the free surface known as Stokes lines. Asymptotic predictions are compared with computational solutions for the position of the free surface. In the unsteady problem, transient effects cause the solution to display more complicated asymptotic behaviour, such as higher-order Stokes lines. The theory of exponential asymptotics is applied to show how the capillary waves evolve over time, and eventually tend to the steady solution.
KW - capillary waves
UR - http://www.scopus.com/inward/record.url?scp=85063885823&partnerID=8YFLogxK
U2 - 10.1017/jfm.2018.1030
DO - 10.1017/jfm.2018.1030
M3 - Article
AN - SCOPUS:85063885823
SN - 0022-1120
VL - 863
SP - 670
EP - 701
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
ER -