Browsing NTNU Open by Author "Jiang, Fengjian"

Now showing items 1-20 of 28

    • Bow Shock Clustering in Particle-laden Wetted Cylinder Flow 

      Shi, Zhaoyu; Jiang, Fengjian; Strandenes, Håkon; Zhao, Lihao; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2020)
      The inhomogeneous distributions of inertial particles in the unsteady flow around a wetted circular cylinder at Re=100 were investigated in one-way coupled three-dimensional numerical simulations. The Kármán vortex cells ...

    • Clusters and coherent voids in particle-laden wake flow 

      Shi, Zhaoyu; Jiang, Fengjian; Zhao, Lihao; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2021)
      Inertial point particles suspended in a two-dimensional unsteady circular cylinder flow at Re = 100 are studied by one-way coupled three-dimensional numerical simulations. The striking clustering pattern in the near-wake ...

    • Diameter ratio effects in the wake flow of single step cylinders 

      Tian, Cai; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2020)
      Vortex interactions behind step cylinders with diameter ratio 2 ≤ D/d ≤ 3 at Reynolds number (ReD) 150 were investigated by directly solving the three-dimensional Navier–Stokes equations. In accordance with the previous ...

    • Different topologies of natural vortex dislocations in Mode A wake 

      Tian, Cai; Shi, Zhaoyu; Jiang, Fengjian; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2022)

    • Experimental and numerical investigations on wave profiles and ventilation on a surface-piercing hydrofoil 

      Solheim Høstmark,; Elisa (Master thesis, 2021)
      En serie eksperimenter ble gjennomført på to separate overflate-brytende hydrofoiler med Froude tall og angrepsvinkler som hovedparametrene. En bred foil med maksimum tykkelse, t = 120mm, der bølgeprofilene ble undersøkt ...

    • Flow Around Curved Tandem Cylinders 

      Aasland, Tale Egeberg; Pettersen, Bjørnar; Andersson, Helge Ingolf; Jiang, Fengjian (Peer reviewed; Journal article, 2022)
      The flow around curved tandem cylinders of equal diameter has been investigated for the first time, by means of direct numerical simulations. A convex configuration was used. The nominal gap ratio was L/D = 3.0 and a ...

    • Forces and torques on a prolate spheroid: low-Reynoldsnumber and attack angle effects 

      Andersson, Helge Ingolf; Jiang, Fengjian (Journal article; Peer reviewed, 2018)
      The three-dimensional flow field around a prolate spheroid has been obtained by integration of the full Navier–Stokes equations at Reynolds numbers 0.1, 1.0, and 10. The 6:1 spheroid was embedded in a Cartesian mesh by ...

    • 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. ...

    • Inertial torque on a small spheroid in a stationary uniform flow 

      Jiang, Fengjian; Lihao, Zhao; Andersson, Helge Ingolf; Gustavsson, Kristian; Pumir, Alain; Mehlig, Bernhard (Peer reviewed; Journal article, 2021)
      How anisotropic particles rotate and orient in a flow depends on the hydrodynamic torque they experience. Here we compute the torque acting on a small spheroid in a uniform flow by numerically solving the Navier-Stokes ...

    • Influences of upstream extensions on flow around a curved cylinder 

      Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2018)
      In simulations of flow around a concave curved cylinder, i.e. free-stream aligned with the plane of curvature and directed towards the inner face of the curvature, one cannot avoid interactions between the cylinder and the ...

    • Low-frequency oscillations in flow past an inclined prolate spheroid 

      Strandenes, Håkon; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2019)
      We analyse the forces on a 45∘ inclined 6:1 prolate spheroid at Reynolds number ReD = 8000. In contrast to flow at lower Reynolds numbers previously investigated, we now find a strong oscillatory behaviour in the global ...

    • Near-Wake of an Inclined 6:1 Spheroid at Reynolds Number 4000 

      Strandenes, Håkon; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2019)
      The flow around a 6:1 prolate spheroid at 45 deg inclination angle and Reynolds number 4000 (based on the minor axis) is described. Despite the fact that the inflow is uniform and steady, the resulting wake is highly ...

    • Numerical investigation of 3D flow around a circular cylinder with forced oscillations 

      Nygård, Jonas (Master thesis, 2023)
      Sirkulære sylindere blir brukt i ulike maritime anvendelser som rørledninger og stigerør. Flere eksperimenter utført ved Marintek ble gjennomført av K.H. Aronsen på problemet med en sylinder som svinger både i x- og ...

    • Numerical studies of particle clustering in circular cylinder wake flows 

      Shi, Zhaoyu (Doctoral theses at NTNU;2022:51, Doctoral thesis, 2022)
      The emphasis of this thesis is to investigate how inertial point particles are clustered and dispersed in the wake of a circular cylinder with an uniform free stream. The numerical simulations that directly solved Navier-Stokes ...

    • Numerical Studies of Viscous Flow Around Step Cylinders 

      Tian, Cai (Doctoral theses at NTNU;2021:122, Doctoral thesis, 2021)
      A step cylinder consists of a small diameter cylinder (d) attached coaxially to a large diameter cylinder (D). Structures with a similar shape as the step cylinder have been extensively used in many marine engineering ap- ...

    • Numerical studies of viscous flow around straight and curved tandem cylinders 

      Aasland, Tale Egeberg (Doctoral theses at NTNU;2024:81, Doctoral thesis, 2024)
      The physics of flow around straight and curved cylinders in tandem is investigated by means of direct numerical simulations (DNS), for transitional and turbulent flow regimes. For straight tandem cylinders in the reattachment ...

    • Numerisk simulering av en viskøs strømning rundt en krum sylinder i tverrstrøm 

      Mortensen, Olav Egaas (Master thesis, 2019)
      Denne masteravhandlingen presenterer numeriske undersøkelser av den tredimensjonale viskøse strømningen rundt en rett sirkulær sylinder og en krum sirkulær sylinder i tverrstrøm. Simuleringer har blitt utarbeidet i ...

    • Numerisk Simulering av strømning rundt en kurvet sylinder med varierende diameter 

      Ramsvik, Emil Severin (Master thesis, 2019)
      I denne masteroppgaven utforskes strømning rundt en konkav buet sylinder med en endring i diameter. Studien bruker direkte numerisk simulering for å løse Navier-Stokes ligningene uten bruk av turbulensmodellering. Fokuset ...

    • Recent Developments and New Results on The Flow Around an Inclined 6:1 Prolate Spheroid 

      Strandenes, Håkon; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Chapter, 2017)
      In the light of new computational resources and improved simulation tools we present new simulations of the flow around an inclined 6:1 prolate spheroid. We present the development of the flow from the symmetric and laminar ...

    • Revisiting the reattachment regime: a closer look at tandem cylinder flow at Re=10000 

      Aasland, Tale Egeberg; Pettersen, Bjørnar; Andersson, Helge Ingolf; Jiang, Fengjian (Peer reviewed; Journal article, 2022)
      Tandem cylinder flow comprises several different flow regimes. Within the reattachment regime, the development of the gap shear layers is of utmost importance to the flow, but has received little attention so far. Through ...