Publisher: ISSR Journals   (Total: 3 journals)   [Sort alphabetically]

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CFD Letters     Open Access   (Followers: 8)
Challenge J. of Concrete Research Letters     Open Access   (Followers: 5)
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CFD Letters
Number of Followers: 8  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2180-1363
Published by ISSR Journals Homepage  [3 journals]
  • URANS Prediction of the Hydrodynamic Interactions of Two Ship-like
           Floating Structures in Regular Waves

    • Authors: Fahmy Ardhiansyah, Rudi W Prastianto, Eko Budi Djatmiko, Ketut Suastika
      Pages: 1 - 17
      Abstract: A side-by-side configuration of floating structures is commonly used in ocean exploration practices, such as offshore vessels for loading and offloading, floating cranes, and offshore floating wind turbines. Computational Fluid Dynamics (CFD) method is current practice for the analysis of hydrodynamic interactions of the side-by-side vessels. The purpose of this study is yo carry out a benchmark study of CFD method applied for the above analysis. URANS CFD method was applied utilizing a k-ε turbulence model and a volume of fluid (VOF) method to capture the free surface. Different ratios of wave length to vessel’s length and different gaps between between the vessels were considered in the study. Simulation results show that the wave length to vessel’s length ratio /L affects significantly the wave pattern around the vessels and inside the gap. For the shorter waves, the gap influences the wave pattern both inside and outside the gap. Further, the pressure distribution on the keel surface of the vessels is asymmetric about the vertical center plane along the vessel, which resulted in roll motion eventhough the vessel is in head seas. Roll motion was observed in all gap variations considered. Amplitude modulation was observed in the heave and pitch motions, while generation of side-band frequency components were observed in the roll motion, which indicate a non-linear fluid-structure interaction.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.117
      Issue No: Vol. 16, No. 12 (2024)
       
  • Effects of Activation Energy and Diffusion Thermo an Unsteady MHD Maxwell
           Fluid Flow over a Porous Vertical Stretched Sheet in the Presence of
           Thermophoresis and Brownian Motion

    • Authors: Aruna Ganjikunta, Bhagya Lakshmi Kuntumalla, Ramachandra Reddy Vaddemani
      Pages: 18 - 37
      Abstract: This article discusses the effects of Activation energy and Diffusion thermo on an unsteady MHD flow of an electrically conducting Maxwell Nanofluid over a stretching sheet in a porous medium in the presence of thermophoresis and Brownian motion. Using the similarity transformations, the partial differential equations corresponding to the momentum, energy, and concentration equations are transformed into a system of nonlinear ordinary differential equations, which are solved numerically using a RungeKutta fourth-order method along with the shooting technique, and the results obtained for different governing flow parameters are drawn graphically, and their effects on velocity, temperature, and concentration profiles are discussed. The values of the skin friction coefficient, Nusselt number coefficient, and Sherwood number coefficient are presented in the table. A comparison with previously reported data is made, and an excellent agreement is noted. The objective of the present study is to use the Activation energy and Diffusion thermo parameters to increase the concentration of chemical species on the boundary layer and temperature, respectively. The temperature of the fluid increases as the radiation parameter, Brownian motion, thermophoresis, and magnetic parameters increase.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.1837
      Issue No: Vol. 16, No. 12 (2024)
       
  • Effect of Different Shapes of Nanoparticles on Mixed Convective Nanofluid
           Flow in a Darcy-Forchhiemer Porous Medium

    • Authors: Annapurna T, K.S.R. Sridhar, M Karuna Prasad
      Pages: 38 - 58
      Abstract: The nanofluid has diverse applications in industries, engineering, and medicine due to its greater thermal characteristics. However, various factors such as the shape and size of nanoparticles, the base fluid, the porous medium, the quadratic drag force, and the viscous dissipation have significant effects on the flow and heat transfer characteristics of nanofluids. Therefore, it is crucial to study the influence of these factors. In this paper, a theoretical investigation is conducted to analyze the mechanisms of thermal conductivities of different shapes of nanoparticles, such as platelet, cylinder, brick and blade on the mixed convective nanofluid flow in a vertical channel saturated with porous medium. Consider ethylene glycol and water as base fluids for the nanoparticles, including copper, aluminum oxide, titanium oxide, silver, and iron oxide. A thin, movable baffle plate of negligible thickness is inserted in the channel and made into double passages. To define the porous matrix, the Darcy-Brinkaman-Forchhiemer model is used, and to define the nanofluid, the Tiwari and Das model is used. Robin boundary conditions are considered for the channel flow. The differential transform method (DTM) is applied to solve non-linear governing equations with inertia, and the perturbation method is applied to solve the problem without inertia. Velocity and temperature cantors are shown graphically using MATLAB and MATHEMATICA. The obtained values by DTM and the perturbation method are well validated and shown graphically. The Nusselt number was evaluated and tabulated for all governing parameters. The objective of this article is to investigate the effect of nonspherical shapes of nanoparticles, the base fluid, the inertial forces of the porous medium, and the buoyancy force on the thermal characteristics of flow and heat transfer of nanofluids. The main findings of this problem are that the optimum velocity and temperature cantor are found for platelet-shaped water-based silver nanofluid.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.3858
      Issue No: Vol. 16, No. 12 (2024)
       
  • Effect of Inlet Pressure on the Polyurethane Spray Nozzle for Soil
           Cracking Improvement: Simulations using CFD Method

    • Authors: Tasnim Zakepeli, Nik Normunira Mat Hassan, Nur Afzanizam Samiran, Anika Zafiah Mohd Rus, Noraini Marsi, Tuan Noor Hasanah Tuan Ismail, Mohd Ridzuan Mohd Jamir, Siti Nur Azila Khalid, Muhamad Iqbal Aiman Mohd Azman
      Pages: 59 - 71
      Abstract: Rigid spray polyurethane (RSPU) was commercially used as an injection in crack walls or soil surfaces to enhance material performance, increase lifetime, and save operating costs. The limitation of the RSPU nozzle was reported as easily clogging when sprayed out to the insulation and crack surface area and the finished product was less aesthetically pleasing. In this study, the RSPU nozzle of flat fan nozzle, 180° angle (Design A), Hollow cone nozzle, 60° angle (Design B), and Full cone nozzle, 90° angle (Design C) were prepared by using the SOLIDWORKS software. The effect of different pressures for RSPU nozzle design at the ranges of 4Mpa, 5MPa, and 6MPa was examined by ANSYS FLUENT software. The velocity of the outer spray nozzle shows a significant increase with increasing inlet pressure of the RSPU nozzle. The results reveal that the highest velocity of RSPU was obtained at the Hollow cone nozzle (Design B) as compared to (Flat fan nozzle) Design A and (Full cone nozzle) Design C at 394.249 m/s at 4MPa, 442.327 m/s at 5MPa and 485.37 m/s at 6MPa, respectively. The distribution droplet area shows the Design B spray formation had wider area coverage at 60° and exhibited that the injection nozzle spray was scatted and uniform at 6MPa. RSPU shows the velocity increased, distribution droplet increased, and output volume spray was decreased at the increasing of injection pressure. Hence, in this study was suggested that the size of RSPU nozzle design must be made at the ranges of 60° to 90° of outlet nozzle to obtain a good RSPU area. In conclusion, design B is the most effective for RSPU nozzle and is useful in injection cracking and insulation materials applications.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.5971
      Issue No: Vol. 16, No. 12 (2024)
       
  • Heat and Mass Transfer Effects on MHD Mixed Convective Flow of a Vertical
           Porous Surface in the Presence of Ohmic Heating and Viscous Dissipation

    • Authors: Hari Krishna Yaragani, Anupama Anumolu, Vijaya Lakshmi G, Bindu Pathuri, Reddy G.V.R.
      Pages: 72 - 84
      Abstract: The present paper addresses the combined effects of thermal radiation and chemical reaction on steady MHD mixed convective flow of heat and mass transfer past a vertical surface under the influence of Joule and viscous dissipation. The governing system of the partial differential equations is transformed into the dimensionless equations using dimensionless variables. The dimensionless equations are solved numerically using two term perturbation technique and numerical solution as in graphically. The effects of the various parameters entering the problem on the dimensionless velocity, temperature and concentration fields within the boundary layer are discussed qualitatively. The velocity increases with an increase in Grashof number Gr, permeability parameter and solutal Grashof number Gm but decreases in magnetic parameter.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.7284
      Issue No: Vol. 16, No. 12 (2024)
       
  • Unsteady MHD Walter’s-B Viscoelastic Flow Past a Vertical Porous
           Plate

    • Authors: Veera Reddy Karnati, Sandhaya Akuri, O.Ramakrishna, M. Gayatri, Srinivasa Rao Tagallamudi, Venkata Ramana Reddy Gurrampati
      Pages: 85 - 96
      Abstract: The present paper intended to analyse an unsteady MHD Walter’s-B viscoelastic flow past a vertical porous plate embedded in a porous medium in the presence of the radiation and chemical reaction effects. The dimensionless partial differential equations of governing equations of the flow field are solved numerically using closed analytical method. The velocity, temperature and concentration profiles are discussed graphically and discussed qualitatively
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.8596
      Issue No: Vol. 16, No. 12 (2024)
       
  • Numerical Investigation of Thermal Performance for Turbulent Water Flow
           through Dimpled Pipe

    • Authors: Ansam Adil Mohammed, Mahmoud Sh. Mahmoud, Suha K Jebir, Ahmed F. Khudheyer
      Pages: 97 - 112
      Abstract: Dimples are tiny indentations on the surfaces of the body that enhance heat transfer and alter fluid flow characteristics on or within the body. Numerical investigations were conducted to analyse the heat transfer and flow characteristics in a cross-combined dimple tube in the range of Reynolds numbers from 6000 to 14000. The finite volume method recognised a novel enhancement model utilising methods for composite-form surfaces. Compared to a smooth tube working similarly, the effects significantly improve the heat transfer index, performance evaluation criteria, and friction factor. A three-dimensional simulation was conducted to clarify the underlying process by which dimples affect thermal performance. The simulation findings suggest that the dimples effectively enhance heat transfer by altering the temperature distribution and increasing the temperature gradient within the central area of the dimple section. A concave surface profile disrupts the flow and prevents the formation of a stable boundary layer, promoting the mixing of hot and cold fluids. Furthermore, the study investigates how geometric characteristics impact thermal and hydraulic efficiencies, emphasising that larger dimples improve overall thermo-hydraulic performance. Specifically, the heat transfer enhancement achieved an average increase of 17.3%, ranging from 18.03% to 38.6%, surpassing that of the traditional smooth tube.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.97112
      Issue No: Vol. 16, No. 12 (2024)
       
  • MHD Stagnation Point Flow of Micropolar Fluid over a Stretching/ Shrinking
           Sheet

    • Authors: Dachapally Swapna, Gurala Thirupathi, Kamatam Govardhan, Ganji Narender, Santoshi Misra, S. Renuka
      Pages: 113 - 127
      Abstract: In this article, the stagnation point flow of a micropolar fluid on a stretching/shrinking sheet has been discussed subject to the assumption of velocity slip. Similarity transformation is used to transform the modelled Partial Differential Equations (PDEs) into a system of Ordinary Differential Equations (ODEs). The numerical results have been found by the shooting technique along with Adams Moulton method of order four. The obtained numerical results are compared with the help of Fortran Language program and compared with the earlier published results and excellent validation of the present numerical results has been achieved for the local Nusselt number. Finally, the numerical results are presented with discussion of the effects of different physical parameters.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.113127
      Issue No: Vol. 16, No. 12 (2024)
       
  • Occupancy Comfort Evaluation in Green Building Rating Tools in Malaysia: A
           Comparative Review

    • Authors: Mohd Zulkifli Ibrahim, Mohd Faizal Mohideen Batcha
      Pages: 128 - 139
      Abstract: Passive design strategy is the approach that maximizing utilization of natural resources to achieve occupancy comfort which covers the thermal comfort, visual comfort and acoustic comfort while minimizing secondary energy usage. Adapting passive design strategy during building design-stage is beneficial in reducing energy load of the building for long term, furthermore to reduce the energy consumption in day to day building operation. Applying Green Building Rating Tools, GBRT promotes passive design strategy for non-residential building and will assist the building designer to comply with the local and international standard. The minimum requirement of occupancy comfort is captured in GBRT rating system with different approach and intension of the system. This review summarize the coverage of passive design strategy sectors for non-residential building in Malaysia by comparing three GBRT system namely Green Building Index, GBI NCNR, MyCREST ICSAS and GreenRE NRB system. GreenRE NRB seems more aggressive in occupancy comfort evaluation compared to GBI NCNR and MyCREST ICSAS. GreenRE allocates 48.7% of total marks focus on occupancy comfort aspect while GBI and MyCREST allocates 14% and 13.2% respectively from the total score. MyCrest had enforce the mandatory compliance of OTTV, RTTV and Uroof to meet baseline requirement as per MS1525:2019 with zero marks allocation. Based on marks percentage allocation, GBI and MyCrest prioritizing visual comfort while GreenRE give more focus on thermal comfort with higher marks allocation. All rating system give less focus on acoustic comfort. On average, 16.3% of marks covers the thermal comfort, 9% covers visual comfort and 1% cover acoustic comfort. GBI and MyCrest focus more on green building materials which covers the building lifecycle includes water management and waste disposal. All system contributes to Malaysia-UNFCCC ratification of Paris Agreement on 45% GHG reduction in longer runs.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.128139
      Issue No: Vol. 16, No. 12 (2024)
       
  • Li-NMC Temperature Modelling Based on Realistic Internal Resistance

    • Authors: Muhammad Fikri Irsyad Mat Razi, Zul Hilmi Che Daud, Zainab Asus, Izhari Izmi Mazali, Anuar Abu Bakar, Mohd Kameil Abdul Hamid
      Pages: 140 - 148
      Abstract: Lithium-ion battery (LIB) produce heat when it is put under charging and discharging process. The heat generated during charging and discharging are directly related to the internal in the battery. This heat generation will cause the battery temperature to rise. The operating temperature for LIB is significantly important because its affect the performance and health of the battery. Gathering battery thermal behavior through experiment is a time consuming, high cost and a fussy process. The process can be made easier through battery thermal modelling. The purpose of this study is to provide a thermal battery model that can predict the battery thermal behavior at wide range of temperature by using realistic internal resistance value from experiment. In this study, a Nickel-Manganese-Cobalt Lithium-ion battery with capacity 40 Ah was discharged with 120 A (3C) and 160 A (4C) current continuously to heat up the battery until a set of targeted temperature achieved. The battery is then discharged with 40 A (1C) pulse current, and the voltage response is measured. The process was repeated until 80°C. From the voltage response data, the internal resistance for the battery was calculated and used as the main input in the thermal model based on heat generation equation to predict the battery temperature. The result shows that the developed thermal model managed to precisely predict battery thermal behaviour with a low average relative error of around 0.634 % to 5.244%. The significance of this study is to provide a battery model that can predict battery thermal behavior precisely at wide range of temperature. This information is important in designing a better battery management system (BMS) to prolong the battery lifetime, slowing degradation rate and avoid safety risk.
      PubDate: 2024-07-21
      DOI: 10.37934/cfdl.16.12.140148
      Issue No: Vol. 16, No. 12 (2024)
       
 
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Publisher: ISSR Journals   (Total: 3 journals)   [Sort alphabetically]

Showing 1 - 2 of 2 Journals sorted by number of followers
CFD Letters     Open Access   (Followers: 8)
Challenge J. of Concrete Research Letters     Open Access   (Followers: 5)
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Email: journaltocs@hw.ac.uk
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