The numerical analysis to understand the characteristics of flow around a honeycomb topography in relation to biofouling control

Zyncoln, Leow; Wong, Yen Myan Felicia

doi:10.1063/1.5121000

Cited by 3 publications

(11 citation statements)

References 17 publications

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“…Table 6. Mesh refinements with level of significance for smooth surface model [11]. From table 6 to table 9, the results indicate that all meshes are valid since the Orthogonal quality in both cases was within the range of 0.15006 to 0.99790 for Sharklet topography models, while the smooth surface model was having the maximum value of 1.…”

Section: Mesh Independence Analysismentioning

confidence: 90%

“…Table 2 shows the mesh refinement on the fluid domain with smooth surface model. This is to select the most suitable element size for the main fluid domain to run the simulation so that the results that are obtained having higher accuracy [11]. The mesh method that was used in this case is Sweep since it is just a simple rectangular geometry without having any extra features on it.…”

Section: Mesh Generationmentioning

confidence: 99%

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An investigation to improve the antifouling properties of the Sharklet topography using computation fluid dynamics

Felicia,

Lee

2023

J. Phys.: Conf. Ser.

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Biofouling is an undesirable phenomenon that occurs on the surface that is submerged underwater for a long time. With the adhesion of microorganisms, it will defect indsutrie especially the marine industry. By having biofouling on the submerged surface of vessels, it larger the drag force and friction that are experienced by the vessels while travelling and thus increase the cost on fuel consumption. To deal with this issue, mechanical approach and chemical approach were firstly developed which were then attempting significance success on decreasing the occurrence of biofouling. However, these approaches are not a sustainable solution. Hence, surface modification is then proposed and developed by the researchers to control the biofouling. Currently, Sharklet topography is one of the popular micro-structures antifouling technology. Few studies have presented successful results of Sharklet topography on the antifouling performance, but lack of research is relevant to the way on improving the antifouling properties of Sharklet topography. Thus, this project is mainly on modifying the Sharklet topography and make comparison with the initial design by studying the hydrodynamic characteristics around the surface through Computation Fluid Dynamics (CFD) analysis. To carry out this experiment, three-dimensional (3D) models for the non-patterned surface and Sharklet micro-structured surfaces will be created in different channels of flow but with similar settings. The data to be identified and compared from both models are flow velocity, shear strain rate and wall shear stress. From this study, it is observed that as varying the sizes of width between the effective range of microtopography sizes (64 μm – 264 μm) under constant height and spacing, the bigger the size of width, the better the performance of antifouling since the wall shear aspect appears the sharp fluctuation for the geometry with aspect ratio of 1.5 as compared 2.0 and 3.0. With the sharply fluctuating shear stress, it will be an unfavorable environment for the microorganisms to settle down.

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Section: Mesh Independence Analysismentioning

confidence: 90%

Section: Mesh Generationmentioning

confidence: 99%

An investigation to improve the antifouling properties of the Sharklet topography using computation fluid dynamics

Felicia,

Lee

2023

J. Phys.: Conf. Ser.

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“…Biofouling is an unwanted hierarchical phenomenon that occurs on underwater surfaces with the Biofouling primarily represents as the accumulation of undesirable deposition of living organisms on the submerged surfaces [1]. Biofouling is a common problem in the marine industry as having biofouling on the engineering structure will lead to corrosion of metal and it might affect the functionality of the machine parts which resulting in the increased of maintenance cost [2]. Furthermore, the marine organisms that adhere to the ship hulls will increase unnecessary hydrodynamic drag and friction which results in the increases of fuel consumption and decreases of cruising speed [3].…”

Section: Introductionmentioning

confidence: 99%

“…The most used chemical agent in the industry is the fouling-release coating (FRCs). However, the result of using FRCs are not as efficient as the use of toxic antifoulants [2]. Hence, researchers are looking into the third approaches which is surface modification that using foul-resistance topographies.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this research focuses on using Computational Fluid Dynamics (CFD) simulation to investigate the likely modification that improve the honeycomb topography design for antifouling applications. According to the research done by Zyncoln et al (2019), the overall antifouling ability for the surface with honeycomb topography design was found to be better than the surface without it [2]. However, there are several weaknesses explained by Zyncoln et al (2019) that some areas of the honeycomb topography might have a possibility of having biofouling.…”

Section: Introductionmentioning

confidence: 99%

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A numerical study to improve honey-comb topography designed for antifouling applications

Felicia,

Loh

2023

J. Phys.: Conf. Ser.

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Biofouling is a common issue faced by marine industry as having biofouling on the ship hulls increase unnecessary drag and friction which results in the increases of fuel consumption and decreases of cruising speed. Therefore, there are several antifouling approaches developed to mitigate the development of settlement of microorganism. The most environmentally friendly approach is surface modification by using foul-resistance topographies. The objective of this study is to investigate the antifouling performance based on the characteristics of the hydrodynamic variables which are the fluid velocity, wall shear stress, and shear strain rate at the surrounding of various designs of honeycomb topography surface. Three models were generated for this study which were Model 1 with an indented honeycomb structure surface, Model 2 with a protruded honeycomb structure surface, and Model 3 with a protruded honeycomb structure surface with different spacing and depth. The dimensions for Model 1 and Model 2 are the same whereas one is indenting while another one is protruding. In addition, Model 3 with different spacing and depth of protruded honeycomb structure was constructed to indicate the optimum design of honeycomb topography. The computer-aided design (CAD) model of the designs of honeycomb topography will be modelled using SolidWorks 2021. The CAD model will then be exported to ANSYS CFX simulator to determine the hydrodynamic variables of different designs of honeycomb topography. By analyzing the results of the simulation, the justification of the overall antifouling performance can be made and validated. The expected outcomes of this study would show a better antifouling performance of a protruding honeycomb topography design as compared to an indented honeycomb topography design. Other than that, the fluctuations in the hydrodynamic variables were higher for the protruded honeycomb structure model as the fluid is flow in the gaps between honeycomb structure instead of inside the honeycomb structure. Furthermore, the probability of fouling organisms being entrapped inside the honeycomb structure is eliminated by using the protruding honeycomb structure design. However, further research needs to be carried out as this study only focuses on the numerical method. The results obtained from this study can be used for future development on honeycomb topography design in antifouling applications, also helped to identify the optimum design of honeycomb topography that will improve the antifouling performance.

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Engineered topographies and hydrodynamics in relation to biofouling control—a review

Halder

Hossain

Pramanik

et al. 2020

Environ Sci Pollut Res

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The numerical analysis to understand the characteristics of flow around a honeycomb topography in relation to biofouling control

Cited by 3 publications

References 17 publications

An investigation to improve the antifouling properties of the Sharklet topography using computation fluid dynamics

An investigation to improve the antifouling properties of the Sharklet topography using computation fluid dynamics

A numerical study to improve honey-comb topography designed for antifouling applications

Engineered topographies and hydrodynamics in relation to biofouling control—a review

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