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Computational Fluid Mechanics II
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Computational Fluid Mechanics II

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (15 December 2023) | Viewed by 8220

Special Issue Editors

Dr. Peng Du

E-Mail Website
Guest Editor
School of Marine Science and Technology, Northwestern Polytechnical University (NPU), 127 Youyi Road, Beilin, Xi’an 710072, China
Interests: hydrodynamics; flow control; flow perception; CFD
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Abdellatif Ouahsine

E-Mail Website
Guest Editor
Laboratoire Roberval, Sorbonne Université, Université de Technology de Compiègne, Centre de recherches Royallieu, CS 60319, CEDEX, 60203 Compiègne, France
Interests: hydrodynamics; fluid–structure interaction; computational fluid mechanics; environmental fluid mechanics; coastal engineering; ocean engineering
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Haibao Hu

E-Mail Website
Guest Editor
School of Marine Science and Technology, Northwestern Polytechnical University, 127 Youyi Road, Beilin, Xi’an 710072, China
Interests: drag reduction; flow control; marine engineering
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Xiaopeng Chen

E-Mail Website
Guest Editor
School of Marine Science and Technology, Northwestern Polytechnical University, 127 Youyi Road, Beilin, Xi’an 710072, China
Interests: multiphase flow; bubbles; Lattice Boltzmann Method
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Fluid flows and their interactions with structures are of great importance in both fundamental research and engineering applications. Revealing their mechanisms inevitably involves fluid mechanics. Computational fluid mechanics techniques are developing to a higher level today with the flourishing of computer science. It is able to predict flow details and hydrodynamic interactions with increasing accuracy and efficiency.

This Special Issue will collect papers on cutting-edge developments in computational fluid mechanics. Papers detailing related methods, including novel numerical algorithms, advanced treatments of solving procedures, parallel acceleration techniques, and the utilization of computational fluid mechanics methods for flow simulation, fluid–structure interaction, etc., are all welcome.

Dr. Peng Du
Prof. Dr. Abdellatif Ouahsine
Prof. Dr. Haibao Hu
Prof. Dr. Xiaopeng Chen
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • CFD
  • hydrodynamics
  • fluid–structure interaction
  • numerical algorithms
  • parallel computing

Published Papers (6 papers)

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Research

33 pages, 15293 KiB  
Article
Dynamic Fluid Structure Interaction of NACRA 17 Foil
by Stig Staghøj Knudsen, Laura Marimon Giovannetti, Brian Nyvang Legarth and Jens Honoré Walther
J. Mar. Sci. Eng. 2024, 12(2), 237; https://doi.org/10.3390/jmse12020237 - 29 Jan 2024
Viewed by 762
Abstract
The NACRA 17 is a small foiling catamaran that is lifted out of the water by two asymmetric z-foils and two rudder elevators. This paper investigates how foil deflection affects not only foil performance but overall boat behaviour using a numerical Fluid Structure [...] Read more.
The NACRA 17 is a small foiling catamaran that is lifted out of the water by two asymmetric z-foils and two rudder elevators. This paper investigates how foil deflection affects not only foil performance but overall boat behaviour using a numerical Fluid Structure Interaction (FSI) model. The deformations are solved with a solid model based on the Finite Element Method (FEM) and the flow is solved with a Reynolds Average Navier-Stokes (RANS) based Finite Volume Model (FVM). The models are strongly coupled to allow dynamic FSI simulations. The numerical model is validated by comparing it to an experimental campaign conducted at the RISE SSPA Maritime Center in Sweden.Validation shows reasonable agreement, but the model can only be considered validated for some rake angles. The large deformation of the foils is found to have a profound effect on the performance of the foils and therefore of the overall catamaran. Turbulence transition and boat speed are found to affect foil forces and, in turn, deformation. Dynamic response of the foils during boat motion as exposed to waves is investigated and finally the full boat hydrodynamic is simulated by including both foils and the rudders in various scenarios. Full article
(This article belongs to the Special Issue Computational Fluid Mechanics II)
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14 pages, 7057 KiB  
Article
Study on the Sand-Scouring Characteristics of Pulsed Submerged Jets Based on Experiments and Numerical Methods
by Hongliang Wang, Xuanwen Jia, Chuan Wang, Bo Hu, Weidong Cao, Shanshan Li and Hui Wang
J. Mar. Sci. Eng. 2024, 12(1), 57; https://doi.org/10.3390/jmse12010057 - 26 Dec 2023
Viewed by 592
Abstract
Water-jet-scouring technology finds extensive applications in various fields, including marine engineering. In this study, the pulse characteristics are introduced on the basis of jet-scouring research, and the sand-scouring characteristics of a pulsed jet under different Reynolds numbers and the impact distances are deeply [...] Read more.
Water-jet-scouring technology finds extensive applications in various fields, including marine engineering. In this study, the pulse characteristics are introduced on the basis of jet-scouring research, and the sand-scouring characteristics of a pulsed jet under different Reynolds numbers and the impact distances are deeply investigated using Flow-3D v11.2. The primary emphasis is on the comprehensive analysis of the unsteady flow structure within the scouring process, the impulse characteristics, and the geometric properties of the resulting scouring pit. The results show that both the radius and depth of the scour pit show a good linear correlation with the jet-flow rate. The concentration of suspended sediment showed an increasing and then decreasing trend with impinging distance. The study not only helps to enrich the traditional theory of jet scouring, but also provides useful guidance for engineering applications, which have certain theoretical and practical significance. Full article
(This article belongs to the Special Issue Computational Fluid Mechanics II)
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21 pages, 7655 KiB  
Article
Reynolds-Averaged Simulation of Drag Reduction in Viscoelastic Pipe Flow with a Fixed Mass Flow Rate
by Zhuoyue Li, Haibao Hu, Peng Du, Luo Xie, Jun Wen and Xiaopeng Chen
J. Mar. Sci. Eng. 2023, 11(4), 685; https://doi.org/10.3390/jmse11040685 - 23 Mar 2023
Viewed by 1244
Abstract
A high molecular polymer solution with viscoelasticity has the effect of reducing frictional drag, which is quite practical for energy saving. Effective simulations of viscoelastic flows in a pipeline with a high Reynolds number is realized by incorporating the constitutive equation of viscoelasticity [...] Read more.
A high molecular polymer solution with viscoelasticity has the effect of reducing frictional drag, which is quite practical for energy saving. Effective simulations of viscoelastic flows in a pipeline with a high Reynolds number is realized by incorporating the constitutive equation of viscoelasticity into the k−ε−v′2¯−f turbulence model. The Finitely Extensive Nonlinear Elastic Peterlin (FENE-P) model is employed for characterizing the viscoelasticity. The drag reduction of fully developed viscoelastic pipe flow with a fixed mass flow rate is studied. Different from increasing the center velocity and without changing the velocity near the wall at a fixed pressure drop rate, the addition of a polymer reduces the velocity near the wall and increases the velocity at the center of the pipe and makes the flow tend to be a laminar flow. Decreasing the solvent viscosity ratio or increasing the maximum extensibility or the Weissenberg number can effectively reduce the turbulence intensity and the wall friction. Under the premise of ensuring calculation accuracy, this Reynolds-averaged simulation method for viscoelastic flow has significant advantages in both computational cost and accuracy, which is promising for drag reduction simulation and practical engineering applications. Full article
(This article belongs to the Special Issue Computational Fluid Mechanics II)
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21 pages, 6692 KiB  
Article
RANS-Based Modelling of Turbulent Flow in Submarine Pipe Bends: Effect of Computational Mesh and Turbulence Modelling
by Qi Yang, Jie Dong, Tongju Xing, Yi Zhang, Yong Guan, Xiaoli Liu, Ye Tian and Peng Yu
J. Mar. Sci. Eng. 2023, 11(2), 336; https://doi.org/10.3390/jmse11020336 - 3 Feb 2023
Viewed by 1852
Abstract
Pipe bend is a critical integral component, widely used in slurry pipeline systems involving various engineering applications, including natural gas hydrate production. The aim of this study is to assess the capability of RANS-based CFD models to capture the main features of the [...] Read more.
Pipe bend is a critical integral component, widely used in slurry pipeline systems involving various engineering applications, including natural gas hydrate production. The aim of this study is to assess the capability of RANS-based CFD models to capture the main features of the turbulent single-phase flow in pipe bends, in view of the future investigation of the hydrate slurry flow in the same geometry. This is different from the available literature in which only a few accounted for the effects of a combination of computational mesh, turbulence model, and near-wall treatment approach. In this study, three types of mesh configuration were adopted to carry out the computations, namely unstructured mesh and two structured meshes with a uniform and nonuniform inflation layer, respectively. To explore the influence of the turbulence model, standard k-ε, low-Reynolds k-ε, and nonlinear eddy viscosity turbulence model were selected to close RANS equations. Pressure coefficient, mean axial velocity, turbulence intensity, secondary flow velocity, and magnitude of secondary flow were regarded as the critical variables to make a comprehensive sensitivity analysis. Predicted results suggest that turbulent kinetic energy is the most sensitive variable to the computational mesh while others tend to stabilize. The largest difference of turbulence kinetic energy was around 26% between unstructured mesh and structured mesh with a nonuniform inflation layer. Additionally, a fully resolved boundary layer can reduce the sensitivity of mesh on turbulent kinetic energy, especially for a nonlinear turbulence model. However, the large gradient and peak value of turbulence intensity near the inner wall of the bend was not captured by the case with a fully resolved boundary layer, compared with that of the wall function used. Furthermore, it has been confirmed that the same rule was detected also for different curvature ratios, Reynolds numbers, and dimensionless wall distance y+. Full article
(This article belongs to the Special Issue Computational Fluid Mechanics II)
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23 pages, 7915 KiB  
Article
A Modified MPS Method with a Split-Pressure Poisson Equation and a Virtual Particle for Simulating Free Surface Flows
by Date Li, Huaixin Zhang and Guangfei Qin
J. Mar. Sci. Eng. 2023, 11(1), 215; https://doi.org/10.3390/jmse11010215 - 13 Jan 2023
Cited by 1 | Viewed by 1631
Abstract
As a Lagrangian mesh-free method, the moving particle semi-implicit (MPS) method can easily handle complex incompressible flow with a free surface. However, some deficiencies of the MPS method, such as inaccurate results, unphysical pressure oscillation, and particle thrust near the free surface, still [...] Read more.
As a Lagrangian mesh-free method, the moving particle semi-implicit (MPS) method can easily handle complex incompressible flow with a free surface. However, some deficiencies of the MPS method, such as inaccurate results, unphysical pressure oscillation, and particle thrust near the free surface, still need to be further resolved. Here, we propose a modified MPS method that uses the following techniques: (1) a modified MPS scheme with a split-pressure Poisson equation is proposed to reproduce hydrostatic pressure stably; (2) a new virtual particle technique is developed to ensure the symmetrical distribution of particles on the free surface; (3) a Laplacian operator that is consistent with the original gradient operator is introduced to replace the original Laplacian operator. In addition, a two-judgment technique for distinguishing free surface particles is introduced in the proposed MPS method. Four free surface flows were adopted to verify the proposed MPS method, including two hydrostatic problems, a dam-breaking problem, and a violent sloshing problem. The enhancement of accuracy and stability by these improvements was demonstrated. Moreover, the numerical results of the proposed MPS method showed good agreement with analytical solutions and experimental results. Full article
(This article belongs to the Special Issue Computational Fluid Mechanics II)
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18 pages, 14298 KiB  
Article
Study on Impact Load and Head Cap Load Reduction Performance of Vehicle Entering Water at High Speed
by Hairui Zhao, Yao Shi, Guang Pan and Qiaogao Huang
J. Mar. Sci. Eng. 2022, 10(12), 1905; https://doi.org/10.3390/jmse10121905 - 5 Dec 2022
Cited by 3 | Viewed by 1326
Abstract
Aiming at the problem of high-speed entry of vehicles with a diameter of 200 mm, a numerical model of high-speed entry of vehicles is established based on the arbitrary Lagrange–Euler (ALE) algorithm, and the numerical simulation of high-speed entry of flat-nosed and round-nosed [...] Read more.
Aiming at the problem of high-speed entry of vehicles with a diameter of 200 mm, a numerical model of high-speed entry of vehicles is established based on the arbitrary Lagrange–Euler (ALE) algorithm, and the numerical simulation of high-speed entry of flat-nosed and round-nosed vehicles is carried out. On this basis, the experimental research on the entry of vehicle with buffer caps is carried out. The following conclusions are obtained through simulation. The peak value of the axial load of the vehicle raises with the increase of the inlet velocity and angle, while the stable value only raises with the increase of the inlet velocity. The impact load on the round-nosed vehicle is obviously smaller than that on the flat-nosed vehicle when the water entry angle is greater than 80°. The peak value of axial load can be reduced by 22% when entering water vertically at 100 m/s. The following conclusions are obtained through experiments. The buffer head cap has a significant load reduction effect. It shows compaction, cracks and breakage under the impact of water. These processes can absorb part of the impact energy, reduce the peak value of axial load and increase the pulse width. The load reduction rate grows from 4.7% to 18.5% when the length of the buffer head cap is increased from 200 mm to 300 mm while the water inlet speed is the same. The damage level of the head cap increases sharply, and the load reduction rate raises when the water entry speed is increased while the length of the buffer head cap is the same. Full article
(This article belongs to the Special Issue Computational Fluid Mechanics II)
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