Blar i NTNU Open på forfatter "Ellingsen, Simen Andreas Ådnøy"
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Path-Following Methods for Calculating Linear Surface Wave Dispersion Relations on Vertical Shear Flows
Maxwell, Peter; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2020)The path-following scheme in Loisel and Maxwell (SIAM J Matrix Anal Appl 39(4):1726–1749, 2018) is adapted to efficiently calculate the dispersion relation curve for linear surface waves on an arbitrary vertical shear ... -
The role of Lagrangian drift in the geometry, kinematics and dynamics of surface waves
Pizzo, Nick; Lenain, Luc; Rømcke, Olav; Ellingsen, Simen Andreas Ådnøy; Smeltzer, Benjamin Keeler (Peer reviewed; Journal article, 2023)The role of the Lagrangian mean flow, or drift, in modulating the geometry, kinematics and dynamics of rotational and irrotational deep-water surface gravity waves is examined. A general theory for permanent progressive ... -
Sheared free-surface flow over three-dimensional obstructions of finite amplitude
Akselsen, Andreas Holm; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2019)When shallow water flows over uneven bathymetry, the water surface is modulated. This type of problem has been revisited numerous times since it was first studied by Lord Kelvin in 1886. Our study analytically examines ... -
Statistics of weakly nonlinear waves on currents with strong vertical shear
Zheng, Zibo; Li, Yan; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2023) -
Surface water waves on depth dependent flows
Li, Yan (Doctoral theses at NTNU;2017:194, Doctoral thesis, 2017)The present thesis provides essential insights into surface water waves propagating atop a horizontal current whose magnitude and direction may vary arbitrarily with water depth. A comprehensive theory in this regard is ... -
Surface Waves Generated by a Translating and Oscillating Source Atop Realistic Shear Flows
Li, Yan; Ellingsen, Simen Andreas Ådnøy (Chapter, 2018)We analyze surface waves generated by a translating, oscillating surface disturbance atop a horizontal background flow of arbitrary depth dependence, with a focus on determining the Doppler resonance. For a critical value ... -
The Error in Predicted Phase Velocity of Surface Waves atop a Shear Current with Uncertainty
Maxwell, Peter; Smeltzer, Benjamin Keeler; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2019)The effect of a depth-dependent shear current U(z) on surface wave dispersion is conventionally calculated by assuming U(z) to be an exactly known function, from which the resulting phase velocity c(k) is determined. This, ... -
Transient wave resistance upon a real shear current
Li, Yan; Smeltzer, Benjamin Keeler; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2018)We study the waves and wave-making forces acting on ships travelling on currents which vary as a function of depth. Our concern is realism; we consider a real current profile from the Columbia River, and model ships with ... -
Water waves in the presence of sub-surface shear: developing an experiment
Berg, Tara (Master thesis, 2016)The planning and analysis of a laboratory set-up for examining the behaviour of water waves in the presence of sub-surface shear is presented in the following work. Water waves propagate on shear currents in many important ... -
Weakly nonlinear transient waves on a shear current: ring waves and skewed Langmuir rolls
Akselsen, Andreas Holm; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2019)We investigate the weakly nonlinear dynamics of transient gravity waves at infinite depth under the influence of a shear current varying linearly with depth. The shear field makes this problem three-dimensional and rotational ...