Browsing NTNU Open by Author "Wang, Hong"
Now showing items 1-16 of 16
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Adaptively Learned Modeling for a Digital Twin of Hydropower Turbines with Application to a Pilot Testing System
Wang, Hong; Ou, Shiqi; Dahlhaug, Ole Gunnar; Storli, Pål-Tore Selbo; Skjelbred, Hans Ivar; Vilberg, Ingrid Kristine (Peer reviewed; Journal article, 2023)In the development of a digital twin (DT) for hydropower turbines, dynamic modeling of the system (e.g., penstock, turbine, speed control) is crucial, along with all the necessary data interface, virtualization, and dashboard ... -
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 ... -
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 ... -
Combined tidal and wind driven flows and residual currents
Holmedal, Lars Erik; Wang, Hong (Journal article, 2015)The effect of a residual current on the combined tidal and wind driven flow and the resulting bedload sediment transport in the ocean has been investigated, using a simple one dimensional two-equation turbulence closure ... -
Discussion/comments of "Parameterization of nearshore wave breaker index" by Chi Zhang, Yuan Li, Yu Cai, Jian Shi, Jinhai Zheng, Feng Cai and Hong Shuai
Myrhaug, Dag; Wang, Hong; Holmedal, Lars Erik (Peer reviewed; Journal article, 2022)The purpose of these comments and discussion has been to point out that wave statistics can be incorporated in future applications of the nearshore wave breaker index formula proposed by Zhang et al. (2021). This is ... -
Effects of air-sea drag coefficient on estimating wind stress using wind statistics
Myrhaug, Dag; Wang, Hong; Holmedal, Lars Erik; Leira, Bernt Johan (Peer reviewed; Journal article, 2022)This article addresses the effects of the air-sea drag coefficient on estimation of wind stress based on wind statistics. This is achieved by applying the same wind stress parameterizations chosen by Wrobel-Niedzwiecka et ... -
Flow patterns in a steady lid-driven rectangular cavity with an embedded circular cylinder
Zhu, Jianxun; Holmedal, Lars Erik; Wang, Hong; Myrhaug, Dag (Peer reviewed; Journal article, 2020)A detailed investigation of the flow in a steady lid-driven cavity of depth to width ratio 1:2 containing a circular cylinder is provided. Three different Reynolds numbers (based on the lid velocity and cavity depth) of ... -
Fluid flow in steady and oscillatory lid-driven square cavities
Zhu, Jianxun; Holmedal, Lars Erik; Myrhaug, Dag; Wang, Hong (Peer reviewed; Journal article, 2017)This paper presents numerical simulations of steady and oscillatory lid-driven cavity flow at different Reynolds numbers with a fixed aspect ratio of 1:1. A projection method (P2 pressure correction method) is applied to ... -
Near-wall effect on flow around an elliptic cylinder translating above a plane wall
Zhu, Jianxun; Holmedal, Lars Erik; Myrhaug, Dag; Wang, Hong (Peer reviewed; Journal article, 2020)In this work, the flow over an elliptic cylinder near a moving wall is investigated for Reynolds numbers less than 150. Here, the ratio between the gap (i.e., the distance between the cylinder and the wall) and the length ... -
Numerical Simulations of Swimming Fish
Mossige, Jon Coll (Master thesis, 2017)A profound understanding of how a fish swims may be used to design innovative propulsion units with higher efficiency than the conventional screw propellers. The gain of such understanding may be aided by the use of ... -
Revisiting statistical properties of surf parameter with characteristic wave parameters for single random waves including spectral bandwidth effects
Myrhaug, Dag; Wang, Hong; Holmedal, Lars Erik; Li, Hongtao (Peer reviewed; Journal article, 2021)Results from a comparative study of the joint distribution of surf parameter and wave period are provided. First, two transformed joint distributions of wave height and wave period are compared. One of the distributions ... -
Revisiting wave friction factors for rough turbulent flow
Myrhaug, Dag; Wang, Hong; Holmedal, Lars Erik (Journal article; Peer reviewed, 2024)The wave friction factor 𝑓𝑤 and the phase lead of the seabed shear stress over the free stream velocity 𝜑 for rough turbulent flow are revisited by utilizing the similarity theory used by Myrhaug (1989). Results are ... -
Stokes drift estimation for deep water waves based on short-term variation of wave conditions
Myrhaug, Dag; Wang, Hong; Holmedal, Lars Erik (Journal article, 2014)The paper provides a simple analytical method which can be used to give estimates of the Stokes drift based on short-term variation of wave conditions. This is achieved by providing bivariate distributions of wave height ... -
Stokes transport in layers in the water column based on long-term wind statistics
Myrhaug, Dag; Wang, Hong; Holmedal, Lars Erik (Journal article; Peer reviewed, 2018)This paper addresses the Stokes transport velocity for deep water random waves in given layers in the water column based on wind statistics, which can be estimated by the simple analytical tool provided here. Results are ... -
Vortex dynamics and flow patterns in a two-dimensional oscillatory lid-driven rectangular cavity
Zhu, Jianxun; Holmedal, Lars Erik; Wang, Hong; Myrhaug, Dag (Peer reviewed; Journal article, 2020)The vortex dynamics in a two-dimensional oscillatory lid-driven cavity with depth-to-width ratio 1:2 has been investigated, covering a wide range of Reynolds numbers and Stokes numbers where this flow is known to be in the ...