Browsing NTNU Open by Author "Zhu, Jianxun"
Now showing items 1-12 of 12
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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 ... -
Coexistence of natural and forced vortex dislocations in step cylinder flow
Tian, Cai; Zhu, Jianxun; Holmedal, Lars Erik (Journal article; Peer reviewed, 2023) -
Effect of the angle of attack on flow around an elliptic cylinder near a moving wall
Zhu, Jianxun; Holmedal, Lars Erik; Tian, Cai (Journal article; Peer reviewed, 2022)The present work investigates the combined effect of the angle of attack (AOA) (the angle between the semi-major axis of the cylinder and the vertical axis), and the gap ratio G/D (where G represents the distance between ... -
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, ... -
Flow over a single shallow dimple
Zhu, Jianxun; Tian, Cai; Holmedal, Lars Erik (Peer reviewed; Journal article, 2024) -
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 ... -
How vortex dynamics affects the structural load in step cylinder flow
Tian, Cai; Zhu, Jianxun; Holmedal, Lars Erik; Andersson, Helge; Jiang, Fengjian; Pettersen, Bjørnar (Journal article; Peer reviewed, 2023)The vortex dynamics and the structural load in a step cylinder (consisting of a small, d, and a large, D, cylinder) flow are investigated numerically at Reynolds number (ReD) 150 for diameter ratios D/d=2.0,2.4 and 2.8. ... -
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 ... -
A numerical study of separation and stagnation points for steady and unsteady flow over an elliptic cylinder near a moving wall
Zhu, Jianxun; Holmedal, Lars Erik (Peer reviewed; Journal article, 2021)Flow separation around an elliptic cylinder with an aspect ratio of 0.4 near a moving wall is investigated numerically for Re 2 ½5; 150 with G=D 2 ½0:1; 2 (where G denotes the distance between the cylinder bottom and the ... -
Three-dimensional wake transition behind an elliptic cylinder near a moving wall
Zhu, Jianxun; Jiang, Fengjian; Holmedal, Lars Erik (Peer reviewed; Journal article, 2021)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 ... -
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 ...