Applications in engineering science最新文献

{"title":"Formulating strain-based quadrilateral membrane finite elements with drilling rotations","authors":"Wei Hao Koh,&nbsp;Logah Perumal,&nbsp;Chee Kuang Kok","doi":"10.1016/j.apples.2024.100188","DOIUrl":"10.1016/j.apples.2024.100188","url":null,"abstract":"<div><p>Membrane finite elements with drilling degrees of freedom have sparked interest in many research works since they can be conveniently combined with plates to form shell elements. This study presents two non-conforming strain-based four-node quadrilateral membrane elements, SBQ13 and SBQ13E, for static analysis. SBQ13 partially satisfies the equilibrium equations, while SBQ13E completely fulfils the force balance equations. Both elements carry drilling rotations at each node. One difficulty when formulating quadrilateral elements is the singularity in the transformation matrix, which is addressed in this study by utilising the properties of singular matrices. Both quadrilateral elements were tested in several benchmark problems. It has been found that both elements passed the higher-order patch test but failed the constant stress patch test. Nevertheless, SBQ13 produced accurate responses in most numerical tests, but SBQ13E unreasonably overestimated the solution. Solving the eigenvalue problem revealed that the SBQ13E element has a near-zero energy deformation mode, which might explain the anomaly. Although fulfilling equilibrium does not always enhance solution accuracy, it is essential to overcome volumetric locking. Apart from the newly developed elements, this paper presents several new ideas that may apply to strain-based element formulations.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"19 ","pages":"Article 100188"},"PeriodicalIF":2.2,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000141/pdfft?md5=c55236c88efe924d5c637c0e39b234b8&pid=1-s2.0-S2666496824000141-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141960694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CFD elucidation of high-pressure subcooled boiling flow towards effects of variable refrigerantproperties using OpenFOAM empirical closures","authors":"Baramee Muangput ,&nbsp;Thet Zin ,&nbsp;Sirawit Namchanthra ,&nbsp;Jetsadaporn Priyadumkol ,&nbsp;Tinnapob Phengpom ,&nbsp;Watcharapong Chookaew ,&nbsp;Chakrit Suvanjumrat ,&nbsp;Machimontorn Promtong","doi":"10.1016/j.apples.2024.100187","DOIUrl":"10.1016/j.apples.2024.100187","url":null,"abstract":"<div><p>Boiling flow presents a significant concern, especially when a liquid surpasses its boiling point, potentially leading to catastrophic consequences. This research utilizes a two-phase code in the OpenFOAM software to investigate bubble formation during flow boiling. The well-established empirical models for calculating wall heat components were selected based on the operating conditions. The study incorporates experimental data from high-pressure boiling flow (10–30 bars) with variable properties of refrigerant R-12. The predictions reveal underpredictions in void fraction and liquid temperature compared to experimental observations. Significantly, the impact of the subcooling degree on void fraction behaviour is emphasized, and a potential underprediction of the evaporation portion is highlighted, particularly near the wall. Challenges in modelling bubble size distribution are evident through discrepancies in bubble diameter and velocity data, indicating the necessity for further advancements in the code. In summary, this numerical study provides valuable insights into the intricate dynamics of high-pressure subcooled boiling flow, especially when considering variable working fluid properties. Future efforts will focus on refining models for nucleation site density, bubble departure size, and lift-off frequency to enhance prediction accuracy.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"19 ","pages":"Article 100187"},"PeriodicalIF":2.2,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266649682400013X/pdfft?md5=f9ba3d42efdea27c11f0dac108e088a9&pid=1-s2.0-S266649682400013X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141623768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Natural convection of viscoplastic fluids in a triangular enclosure","authors":"M.S. Aghighi,&nbsp;H. Masoumi,&nbsp;Armin Farsi","doi":"10.1016/j.apples.2024.100186","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100186","url":null,"abstract":"<div><p>This study extends the analysis of natural convection in a viscoplastic fluid to flow within a triangular enclosure. The finite-element approach provided a numerical solution to the continuity, momentum, and energy equations. The governing parameters for this problem are the Rayleigh number, <span><math><mrow><mo>(</mo><mrow><mi>R</mi><mi>a</mi><mo>=</mo><msup><mrow><mn>10</mn></mrow><mn>4</mn></msup><mo>−</mo><msup><mrow><mn>10</mn></mrow><mn>6</mn></msup></mrow><mo>)</mo></mrow></math></span>, yield number, <span><math><mrow><mo>(</mo><mrow><mi>Y</mi><mo>=</mo><mn>0</mn><mo>−</mo><msub><mi>Y</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub></mrow><mo>)</mo></mrow></math></span>, aspect ratio, <span><math><mrow><mo>(</mo><mrow><mfrac><mi>H</mi><mi>L</mi></mfrac><mo>=</mo><mn>0.5</mn><mo>−</mo><mn>2.5</mn></mrow><mo>)</mo></mrow></math></span>, and slope angle, <span><math><mrow><mo>(</mo><mrow><mi>∅</mi><mo>=</mo><mn>0</mn><mo>−</mo><mfrac><mi>π</mi><mn>2</mn></mfrac></mrow><mo>)</mo></mrow></math></span>. The influence of these parameters on the heat and mass transfer, morphology of yielded/unyielded regions, and fluid flow were thoroughly examined. The results show that two opposing factors influence the flow behavior and heat transmission within the triangular enclosure. The proximity of the walls restricts the convective movement, leading to reduced heat transfer. However, the proximity of hot and cold sources increases the temperature gradient and heat transfer. The unique influence of the viscoplastic material properties, particularly the yield stress, further distinguishes the heat transfer in this triangular enclosure from other geometries. The results indicate that an increase in the Rayleigh number mitigates the effects of yield stress to some extent. However, the accumulation of unyielded material at the triangular apex hinders convection flow. Furthermore, the viscoplastic fluid flow and heat transfer changed significantly with changes in triangle height. In particular, the maximum yield stress increased by more than 100 % as the aspect ratio increased from 0.5 to 2.5. A change in the slope angle causes a continuous transition from subcritical to supercritical bifurcation, significantly affecting the morphology of the yielded and unyielded areas, and the maximum (critical) yield number. Finally, correlations were developed to predict the Nusselt number and maximum yield stress in all cases.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"19 ","pages":"Article 100186"},"PeriodicalIF":2.2,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000128/pdfft?md5=1d10892fe7e2be249a48729629abb2b5&pid=1-s2.0-S2666496824000128-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141480006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical analysis is being conducted to investigate the effect of Nano fluids on the melting process of phase change materials (PCMs) in a semi-cylindrical container.","authors":"Ali Basem","doi":"10.1016/j.apples.2024.100185","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100185","url":null,"abstract":"<div><p>Analytical investigation of the impact of Nano fluids on the melting process of phase change materials (PCM) inside a semi-cylindrical container. In order to analyse the study in a quantitative manner, the combination of enthalpy and porosity was used using the ANSYS/FLUENT 22 programme. This experiment used phase transition materials, namely paraffin wax (RT58). Based on the findings of this research, it is seen that the inclusion of Nano fluid in the PCMs accelerates the dissolving process compared to the PCMs without these materials. The use of nanomaterials results in a reduction in the time needed to complete the melting process by 3 %, 4 %, and 5 % when used at concentrations of 10 %, 20 %, and 30 %, respectively. This study is important for the use of phase-change materials in the cooling of large electronic devices.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"19 ","pages":"Article 100185"},"PeriodicalIF":2.2,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000116/pdfft?md5=6aa8c5b0efc506205d7adc3f4f83c169&pid=1-s2.0-S2666496824000116-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141480005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advances of natural fiber composites in diverse engineering applications—A review","authors":"Fardin Khan ,&nbsp;Nayem Hossain ,&nbsp;Fuad Hasan ,&nbsp;S M Maksudur Rahman ,&nbsp;Safiullah Khan ,&nbsp;A Z A Saifullah ,&nbsp;Mohammad Asaduzzaman Chowdhury","doi":"10.1016/j.apples.2024.100184","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100184","url":null,"abstract":"<div><p>This paper emphasizes the significant usage of natural fiber as a reinforced composite in the potential engineering field. Mechanical, civil, textile, agricultural, and other engineering sectors have already initiated the utilization of natural fiber in their multiple fields. After going through some processes like treating chemically and synthesizing them accordingly, natural fiber composites are prepared for respective implementation. Unlike other types of composite materials, natural fiber composites have some unique properties like recyclability, adaptability, environmental safety, and easy persuasion. On the other hand, different types of naturally oriented fiber like jute, cotton, silk, linen, hemp, etc. have almost the same kind of mechanical, thermal, and chemical features as traditional composite materials. Additionally; automobile, marine, aerospace, medical, and recreation industries claim a significant realm in this type of material kingdom. Though moisture problems, fiber swelling, and safe reusability are threatening for natural fiber-reinforced composites, more research will certainly reduce these problems. Researchers play a significant role in the permanent solution of different applications of natural fiber composites in every engineering sector.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"18 ","pages":"Article 100184"},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000104/pdfft?md5=503d0bdf076b58a690ffa9f61d6a12f2&pid=1-s2.0-S2666496824000104-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141264210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tensile behavior of polycarbonate: Key aspects for accurate constitutive modelling and simulation","authors":"Raffaele Barbagallo ,&nbsp;Giuseppe Mirone ,&nbsp;Luca Landi ,&nbsp;Giuseppe Bua","doi":"10.1016/j.apples.2024.100183","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100183","url":null,"abstract":"<div><p>Polycarbonate (PC) is a thermoplastic polymer used in many engineering applications such as safety devices and aerospace components. However, the unique behavior of PC under tensile load and its effects on the estimation of its constitutive curve are often overlooked in the literature, neglecting to consider crucial aspects of the characterization process. This work carries out a comprehensive analysis of the mechanical behavior of PC to understand the key points for accurate constitutive modeling and simulation of its static tensile performance, including its unconventional deformation mechanisms. The work starts from the accurate analysis of a representative experimental static tensile test on a rectangular section PC specimen and the evaluation of its true stress-strain curve. This analysis, carried out considering the classic length-based approach and the more accurate area-based approach, makes it possible to evaluate in detail the peculiar tensile behavior of this material. The mathematical form of the PC true stress-strain curve is then justified and the coincidence of the obtained length-based and area-based estimates of the same is demonstrated. Then, based on the in-depth understanding of the dynamics underlying the mechanical behavior of PC and making use of FEM simulations, the key points for obtaining its constitutive curve are defined. It is demonstrated that the constitutive curve is able to completely determine the behavior of PC, including its peculiar deformation mechanism. It is also highlighted which specific characteristics of the constitutive curve are critical in affecting various aspects of the material's behavior. The final constitutive curve of PC at hand is then obtained with an inverse approach, capable of accurately simulating all aspects of its tensile behavior. The validity of the proposed modelling key points is then confirmed, effectively explaining the underlying phenomena controlling the tensile behavior of PC and massively reducing uncertainty in the estimation of its constitutive curve starting from its area-based true curve.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"18 ","pages":"Article 100183"},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000098/pdfft?md5=f77e6409eac3210174f2ac609dd25cc0&pid=1-s2.0-S2666496824000098-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140951012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexible structures as a countermeasure to reduce local scour along longitudinal walls","authors":"Nelson J. Cely-Calixto ,&nbsp;Melquisedec Cortés-Zambrano ,&nbsp;Alberto Galvis-Castaño ,&nbsp;Gustavo A. Carrillo-Soto","doi":"10.1016/j.apples.2024.100182","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100182","url":null,"abstract":"<div><p>The current study focused on investigating the effectiveness of a flexible structural approach for mitigating local scour along longitudinal walls in rivers with well-levelled granular beds. To carry out this study, a hydraulic channel was used as the experimental setup. The experiment aimed to evaluate the influence of several key parameters, including slope (ranging from 1 % to 2.5 %), flow rate (set at 0.017 m³/s and 0.030 m³/s) and width of the flexible structure (which was varied at 0.08, 0.12, and 0.15 m). The results of this study are remarkable and have important implications for river engineering and erosion control. The 0.15 m flexible system exhibited a remarkable ability to decrease scouring, especially under conditions of high flows and steeper slopes. In such scenarios, the flexible structure demonstrated efficiencies exceeding 80 %, signifying a substantial reduction in local scour. These findings are important because they suggest that the flexible structural approach can be an effective solution for mitigating scour in rivers with well-levelled granular beds.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"18 ","pages":"Article 100182"},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000086/pdfft?md5=661dcd8cc0f617f10de8f5dc4e189477&pid=1-s2.0-S2666496824000086-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140622168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytical solution of the Poiseuille flow of a De Kee viscoplastic fluid","authors":"Alexandros Syrakos ,&nbsp;Aggelos Charalambous ,&nbsp;Georgios C. Georgiou","doi":"10.1016/j.apples.2024.100181","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100181","url":null,"abstract":"<div><p>We provide an explicit analytical solution of the planar Poiseuille flow of a viscoplastic fluid governed by the constitutive equation proposed by De Kee and Turcotte (1980). Formulae for the velocity and the flow rate are derived, making use of the Lambert W function. It is shown that a solution does not always exist because the flow curve is bounded from above and hence the rheological model can accommodate stresses only up to a certain limit. In fact, the flow curve reaches a peak at a critical shear rate, beyond which it exhibits a negative slope, giving rise to unstable solutions.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"18 ","pages":"Article 100181"},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000074/pdfft?md5=c3464e88a53ef4796d77c128cefe09d7&pid=1-s2.0-S2666496824000074-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140618190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving the lateral load resistance capacity of cellular lightweight concrete (CLC) block masonry walls through ferrocement overlay","authors":"Irfanullah ,&nbsp;Akhtar Gul ,&nbsp;Khalid Khan ,&nbsp;Inayat Ullah Khan ,&nbsp;Hany M. Seif ElDin ,&nbsp;Marc Azab ,&nbsp;Khan Shahzada","doi":"10.1016/j.apples.2024.100180","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100180","url":null,"abstract":"<div><p>Cellular lightweight concrete (CLC) block masonry is an eco-friendly building material gaining popularity in both developed and developing countries. Despite its increasing use, the material's behavior under seismic loading remains insufficiently understood. This research involved quasi-static testing of two full-scale CLC blocks masonry walls strengthened with ferrocement overlay. One of the strengthened walls was subjected to confinement, while the other was unconfined. The aim was to assess their seismic performance by comparing force deformation curves, damping, stiffness degradation, and structural performance levels with non-strengthened walls. The findings indicate that the strengthened masonry outperformed the unreinforced version, suggesting that CLC block masonry exhibits potential for effective performance in low to moderate seismic zones.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"18 ","pages":"Article 100180"},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000062/pdfft?md5=dc69c08e398b70930318434bc7df3816&pid=1-s2.0-S2666496824000062-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140620881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The birth of a volcano: A nonlinear convective model for rock melting at the asthenosphere—Lithosphere boundary","authors":"Carmelo Filippo Munafò ,&nbsp;Cataldo Godano ,&nbsp;Francesco Oliveri","doi":"10.1016/j.apples.2024.100179","DOIUrl":"https://doi.org/10.1016/j.apples.2024.100179","url":null,"abstract":"<div><p>The investigation of the physical processes determining the melting of the lithospheric rocks is of crucial importance for understanding the volcanic dynamics and its related consequences. Rock melting begins when a sufficiently high temperature is experienced by the rock solidus. The heat transfer from the asthenosphere to the lithosphere can be assumed as the main mechanism accountable for the partial melting of rocks, and initiating magma generation. The heat transfer to the lithosphere is considered to be governed mainly by the convective motion inside the asthenosphere. In order to mathematically describe this process, a generalization of a nonlinear convective 1D model, possibly representing a useful though simplified model for the birth of a volcano, and already analyzed from an analytical viewpoint (Godano et al., 2022), is investigated; here, we solve numerically some physically meaningful initial and boundary value problems, and discuss the results.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"18 ","pages":"Article 100179"},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666496824000050/pdfft?md5=a980a80dd26b88c56b39dd9514bc5cec&pid=1-s2.0-S2666496824000050-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140014572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}