Browsing NTNU Open by Author "Myrhaug, Dag"
Now showing items 1-20 of 85
-
3D Numerical Modelling of Non-Linear and Breaking Wave Forces On Offshore Wind Turbine Substructures
Aggarwal, Ankit (Doctoral theses at NTNU;2019:66, Doctoral thesis, 2019)Offshore wind energy technology has experienced a remarkable growth in the last few decades due to an increasing focus towards renewable energy research. The objective of the research towards offshore wind energy is to ... -
A rational approach to seepage flow effects on bottom friction beneath random waves
Myrhaug, Dag; Holmedal, Lars Erik; Ong, Muk Chen (Journal article, 2014)The bottom friction beneath random waves is predicted taking into account the effect of seepage flow. This is achieved by using wave friction factors for rough turbulent, smooth turbulent and laminar flow valid for regular ... -
Addendum to "Stokes transport in layers in the water column based on long-term wind statistics": assessment using long-term wave statistics
Myrhaug, Dag; Wang, Hong; Holmedal, Lars Erik (Journal article; Peer reviewed, 2019)This article addresses the Stokes drift in layers in the water column for deep water random waves based on wave statistics in terms of the sea state wave parameters significant wave height and mean zero-crossing wave period. ... -
Analysis of Observed Streaming in Field Measurements
Wang, Hong; Troels, Aagaard; Holmedal, Lars Erik; Myrhaug, Dag (Journal article; Peer reviewed, 2016)Analysis of velocity and suspended sediment concentration data from field measurements at Pearl Beach in New South Wales, Australia, reveals the existence of onshore currents in the close vicinity of the rippled bed, whereas ... -
Application of wave runup and wave rundown formulae based on long-term variation of wave conditions
Myrhaug, Dag; Leira, Bernt Johan (Journal article, 2017)The purpose of this note is to demonstrate that it is possible to use the proposed formulae in Blenkinsopp et al. [1] to estimate runup and rundown based on long-term variation of wave conditions by using the Myrhaug and ... -
Assessment of Methods for Short-Term Extreme Value Analysis of Riser Collision
Fu, Ping; Leira, Bernt Johan; Myrhaug, Dag (Chapter, 2018)Risers are commonly arranged as clusters with relatively small spacing due to economic necessity. As a consequence, collision between risers becomes an essential problem. This study presents a comprehensive assessment of ... -
Assessment of wave power for sea states at different sites
Lothe, Marie (Master thesis, 2018)The aim of this thesis is to investigate available and captured wave power at five different locations on the Norwegian continental shelf; Haltenbanken, North Sea Center, Ekofisk, Utsira and Tromsøflaket. A literature ... -
Assessment of wave runup and wave rundown based on observed long-term wave conditions
Myrhaug, Dag; Sunde, Tonje (Journal article; Peer reviewed, 2019)The article presents an analytical method that can be applied to provide first estimates of wave runup (RU) and wave rundown (RD) on shorelines and coastal structures based on observed long-term wave statistics and is ... -
Breaking Characteristics and Geometric Properties of Spilling Breakers over Slopes
Alagan Chella, Mayilvahanan; Bihs, Hans; Myrhaug, Dag; Muskulus, Michael (Journal article; Peer reviewed, 2015)A two-phase flow CFD model based on the Reynolds-Averaged Navier–Stokes (RANS) equations coupled with the level set method (LSM) and k − ω turbulence model is used to simulate spilling breakers over a sloping bed. In order ... -
Cavity flows and wake behind an elliptic cylinder translating above the wall
Zhu, Jianxun (Doctoral theses at NTNU, 2020:312, Doctoral thesis, 2020)Vortex formation is one of the fundamental modes in fluid mechanics and it can develop in almost every realization of fluid motion. Studying its fundamental dynamics and interactions is of great interest for engineering ... -
Characteristics and Profile Asymmetry Properties of Waves Breaking over an Impermeable Submerged Reef
Alagan Chella, Mayilvahanan; Bihs, Hans; Myrhaug, Dag (Journal article; Peer reviewed, 2015)In the present study, a 3D two-phase flow CFD model that solves the unsteady, incompressible Reynolds-Averaged Navier–Stokes equations has been used to simulate breaking waves over an impermeable submerged reef. The level ... -
Characteristics of breaking irregular wave forces on a monopile
Aggarwal, Ankit; Bihs, Hans; Myrhaug, Dag; Alagan Chella, Mayilvahanan (Journal article; Peer reviewed, 2019)The substructures of offshore wind turbines are subjected to extreme breaking irregular wave forces. The present study is focused on investigating breaking irregular wave forces on a monopile using a computational fluid ... -
Comparative study on the dynamic response of a Spar type buoy and a Sevan type cylinder floating production unit
Odden, Eirik Hollerud (Master thesis, 2012)Comparative study on the dynamic response of a Spar type buoy and a Sevan type cylinder floating production unit -
Constructive Alignment in Science and Engineering: From Principle to Practice
Gynnild, Vidar; Leira, Bernt Johan; Myrhaug, Dag; Holmedal, Lars Erik; Mossige, Jon Coll (Journal article; Peer reviewed, 2019)This paper reports on an action research study on task design and constructive alignment in an optional module at the Norwegian University of Science and Technology. While students appreciated the two professors’ teaching, ... -
Design of Artificial Seaweeds for Assessment of Hydrodynamic Properties of Seaweed Farms
Norvik, Carina (Master thesis, 2017)In recent years the prospect of having a seaweed industry in Norway has become of interest. Assessing the hydrodynamic properties of seaweed farms through experiments can help optimize its design and thereby potential ... -
Discussion/comments regarding "Distribution and air-sea fluxes of biogenic gases and relationships with phytoplankton and nutrients in the central basin of the South China Sea during summer" by X. Zhai, H.-H. Zhang, G.-P. Yang, J.-L. Li, D. Yuan
Myrhaug, Dag (Journal article; Peer reviewed, 2018)The purpose of this discussion is to demonstrate how a formula used by Zhai et al. (2018) can be utilized to estimate the sea-air fluxes of biogenic gases based on wind statistics. Results are exemplified using long-term ... -
Discussion/comments regarding "Sea spray icing phenomena on marine vessels and offshore structures: Review and formulation" by A.R. Dehghani-Sanij, S.R. Dehghani, G.F. Naterer, Y.S. Muzychka
Myrhaug, Dag; Fu, Ping (Journal article; Peer reviewed, 2017)The purpose of this discussion is to demonstrate how the formula for the liquid water content in wind-generated seawater spray presented by Dehghani-Sanij et al. (2017) in conjunction with available wind speed statistics ... -
Effects of an inserted circular cylinder on a steady lid-driven rectangular cavity flow
Zhu, Jianxun; Holmedal, Lars Erik; Myrhaug, Dag (Journal article; Peer reviewed, 2019)This paper provides numerical investigations of flow in a steady lid-driven cavity of depth to width ratio 1/3 containing a circular cylinder. The inner cylinder is treated using a direct-forcing immersed boundary method, ... -
Effects of soil profile variation and scour on structural response of an offshore monopile wind turbine
Li, Hui; Ong, Muk Chen; Leira, Bernt Johan; Myrhaug, Dag (Journal article, 2018)This paper presents an engineering approach to study the effects of soil profile variation and scour on structural response of an offshore monopile wind turbine. A wind-wave model for finite water depth is proposed to ... -
Estimation of breaking wave properties and their interaction with a jacket structure
Aggarwal, Ankit; Bihs, Hans; Shirinov, Seimur; Myrhaug, Dag (Journal article; Peer reviewed, 2019)The numerical investigation of breaking wave interaction with jacket type offshore wind turbine substructures is quite challenging due to multiple jacket members and the complicated hydrodynamics of breaking waves around ...