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Investigation on the effect of metal foam properties on the PCM melting performance subjected to various heat fluxes 不同热通量下泡沫金属性能对PCM熔融性能影响的研究
Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2019.273552.354
A. Noghrehabadi, Amin Samimi Behbahan, C. Wong, M. Behbahani-Nejad
{"title":"Investigation on the effect of metal foam properties on the PCM melting performance subjected to various heat fluxes","authors":"A. Noghrehabadi, Amin Samimi Behbahan, C. Wong, M. Behbahani-Nejad","doi":"10.22059/JCAMECH.2019.273552.354","DOIUrl":"https://doi.org/10.22059/JCAMECH.2019.273552.354","url":null,"abstract":"The purpose of this paper is to analyze the effects of structural and mechanical characteristics of metal foam on the melting behavior of phase change materials under the influence of different heat fluxes. To this aim, a two dimensional numerical model considering the non-equilibrium thermal factor, non-Darcy effect and local natural convection was used. The governing equations of PCM and metal foam are discretized using a finite volume method with a collocated grid arrangement. To simulate the melting of PCM, the enthalpy-porosity method is applied which computes the liquid fraction at each iteration, based on the enthalpy balance. The effect of metal foam characteristics (porosity, pores size and base material) and wall heat flux on the PCM melting time were investigated. The result showed that for both wall heat fluxes (4000 W m-2 and 8000 W m-2), foam structure and its mechanical properties have significant influence on the PCM melting time which these effects should be considered.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":"52 1","pages":"320-331"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44086164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Direct Normal Form Analysis of Oscillators with Different Combinations of Geometric Nonlinear Stiffness Terms 具有不同几何非线性刚度项组合的振子的直接正态分析
Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22055/JACM.2021.34016.2324
Ayman Nasir, N. Sims, D. Wagg
{"title":"Direct Normal Form Analysis of Oscillators with Different Combinations of Geometric Nonlinear Stiffness Terms","authors":"Ayman Nasir, N. Sims, D. Wagg","doi":"10.22055/JACM.2021.34016.2324","DOIUrl":"https://doi.org/10.22055/JACM.2021.34016.2324","url":null,"abstract":"Nonlinear oscillators with geometric stiffness terms can be used to model a range of structural elements such as cables, beams and plates. In particular, single-degree-of-freedom (SDOF) systems are commonly studied in the literature by means of different approximate analytical methods. In this work, an analytical study of nonlinear oscillators with different combinations of geometric polynomial stiffness nonlinearities is presented. To do this, the method of direct normal forms (DNF) is applied symbolically using Maple software. Closed form (approximate) expressions of the corresponding frequency-amplitude relationships (or backbone curves) are obtained for both e and e2 expansions, and a general pattern for e truncation is presented in the case of odd nonlinear terms. This is extended to a system of two degrees-of-freedom, where linear and nonlinear cubic and quintic coupling terms exist. Considering the non-resonant case, an example is shown to demonstrate how the single mode backbone curves of the two degree-of-freedom system can be computed in an analogous manner to the approach used for the SDOF analysis. Numerical verifications are also presented using COCO numerical continuation toolbox in Matlab for the SDOF examples.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":"7 1","pages":"1167-1182"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48633433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
VIV Control Strategies Using Displacement-Based Phenomenological Model 基于位移现象学模型的VIV控制策略
Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22055/JACM.2021.32635.2050
M. Hajj, Asrhad Mehmood, I. Akhtar, K. Billah
{"title":"VIV Control Strategies Using Displacement-Based Phenomenological Model","authors":"M. Hajj, Asrhad Mehmood, I. Akhtar, K. Billah","doi":"10.22055/JACM.2021.32635.2050","DOIUrl":"https://doi.org/10.22055/JACM.2021.32635.2050","url":null,"abstract":"Linear and nonlinear feedback control of vortex-induced vibrations are assessed using a single degree-of-freedom phenomenological model of the uncontrolled response. The model is based on the role of linear and nonlinear damping forces in inducing and limiting the amplitude of these vibrations. First, the model prediction is validated using data from previously published high-fidelity direct numerical simulations. Then, linear and nonlinear control are applied to the validated model over a broad range of gain values. The predicted controlled responses are also validated against previously published results from high-fidelity numerical simulations. Based on this validation, it is shown that the single degree-of-freedom model is an effective alternative, in terms of computational cost, to high fidelity simulations in assessing control strategies over broad regions of control gains.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":"7 1","pages":"1090-1097"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49566731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical Study on Poiseuille Flow of Herschel-Bulkley Fluid in Porous Media 多孔介质中Herschel-Bulkley流体泊泽维尔流动的理论研究
Applied and Computational Mechanics Pub Date : 2021-05-30 DOI: 10.22055/JACM.2021.36921.2928
D. Sankar, K. Viswanathan, A. Nagar, N. A. Jaafar, A. Kumar
{"title":"Theoretical Study on Poiseuille Flow of Herschel-Bulkley Fluid in Porous Media","authors":"D. Sankar, K. Viswanathan, A. Nagar, N. A. Jaafar, A. Kumar","doi":"10.22055/JACM.2021.36921.2928","DOIUrl":"https://doi.org/10.22055/JACM.2021.36921.2928","url":null,"abstract":"This theoretical study analyses the effects of geometrical and fluid parameters on the flow metrices in the Hagen-Poiseuille and plane-Poiseuille flows of Herschel-Bulkley fluid through porous medium which is considered as (i) single pipe/single channel and (ii) multi–pipes/multi-channels when the distribution of pores size in the flow medium are represented by each one of the four probability density functions: (i) Uniform distribution, (ii) Linear distribution of Type-I, (iii) Linear distribution of Type-II and (iv) Quadratic distribution. It is found that in Hagen-Poiseuille and plane-Poiseuille flows, Buckingham-Reiner function increases linearly when the pressure gradient increases in the range 1 - 2.5 and then it ascends slowly with the raise of pressure gradient in the range 2.5 - 5. In all of the four kinds of pores size distribution, the fluid’s mean velocity, flow medium’s porosity and permeability are substantially higher in Hagen-Poiseuille fluid rheology than in plane-Poiseuille fluid rheology and, these flow quantities ascend considerably with the raise of pipe radius/channel width and a reverse characteristic is noted for these rheological measures when the power law index parameter increases. The flow medium’s porosity decreases rapidly when the period of the pipes/channels distribution rises from 1 to 2 and it drops very slowly when the period of the pipes/channels rises from 2 to 11.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41616343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Performance Investigation of Simple Low-dissipation AUSM (SLAU) Scheme in Modeling of 2-D Inviscid Flow in Steam Turbine Cascade Blades 简单低耗散AUSM (SLAU)方案在汽轮机叶栅二维无粘流动建模中的性能研究
Applied and Computational Mechanics Pub Date : 2021-05-10 DOI: 10.22055/JACM.2021.36513.2857
F. E. Azghadi, M. Pasandidehfard, M. R. Mahpeykar
{"title":"Performance Investigation of Simple Low-dissipation AUSM (SLAU) Scheme in Modeling of 2-D Inviscid Flow in Steam Turbine Cascade Blades","authors":"F. E. Azghadi, M. Pasandidehfard, M. R. Mahpeykar","doi":"10.22055/JACM.2021.36513.2857","DOIUrl":"https://doi.org/10.22055/JACM.2021.36513.2857","url":null,"abstract":"This study evaluates the performance of the SLAU, AUSM+UP upwind schemes, and CUSP artificial dissipation scheme for the flow through the convergent-divergent nozzles and turbine stator blades under different pressure ratios by developing an in-house code. By comparing the results with analytical and experimental results, it is found that, despite the simplicity of the SLAU scheme in the absence of tuning variables, it provides reasonable predictions for different turbine blades in point of location and strength of the shocks. The SLAU scheme could converge at a much higher rate, leading to very much lower values of residuals. The SLAU scheme causes about 30% and 20% improvements over the prediction of the shock-induced losses in supersonic and subsonic outlet flows, respectively.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41798541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Alternative Integration Approaches in the Weight Function Method for Crack Problems 裂纹问题权函数法的可选积分方法
Applied and Computational Mechanics Pub Date : 2021-05-09 DOI: 10.22055/JACM.2021.37137.2968
M. Eder, Xiao Chen
{"title":"Alternative Integration Approaches in the Weight Function Method for Crack Problems","authors":"M. Eder, Xiao Chen","doi":"10.22055/JACM.2021.37137.2968","DOIUrl":"https://doi.org/10.22055/JACM.2021.37137.2968","url":null,"abstract":"This study proposes two alternative approaches to complement existing integration strategies used in the weight function method for linear elastic crack problems. The first approach is based on an interpolation type integration scheme and the second approach is based on Gauss quadrature. The proposed approaches enable a computationally efficient numerical integration for computing stress intensity factors in 2D fracture problems. The efficiency is gained through a comparatively low number of integration points facilitated by higher-order approximation. The integration weights only need to be computed once for a given crack length-to-width ratio and can be applied to arbitrary continuous and smooth stress distributions. The proposed approaches show excellent accuracy. In particular, the Gauss quadrature approach exhibits several orders of magnitude more accuracy compared to the most commonly used trapezoidal integration.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41984613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Review of Enhanced Oil Recovery Decision Making in Complex Carbonate Reservoirs: Fluid Flow and Geomechanics Mechanisms 复杂碳酸盐岩油藏提高采收率决策研究综述：流体流动与地质力学机制
Applied and Computational Mechanics Pub Date : 2021-05-08 DOI: 10.22059/JCAMECH.2021.318511.596
Seydeh Hosna Talebian, A. Fahimifar, A. Heidari
{"title":"Review of Enhanced Oil Recovery Decision Making in Complex Carbonate Reservoirs: Fluid Flow and Geomechanics Mechanisms","authors":"Seydeh Hosna Talebian, A. Fahimifar, A. Heidari","doi":"10.22059/JCAMECH.2021.318511.596","DOIUrl":"https://doi.org/10.22059/JCAMECH.2021.318511.596","url":null,"abstract":"As a result of reduction trend in exploration of super-giant carbonate fields and depletion of the proven mature fields categorized as easy oil, development of tight, deep carbonates with more complexities in reservoir rock and fluid behavior have become of interest for exploration and development companies in recent years. New challenges have arisen in development of complex carbonates due to fracture network distribution uncertainty, lateral and vertical fluid behavior heterogeneities, unstable asphaltene content, high H2S and CO2 contents and high salinity formation brine. The complexity elements and problems for downhole sampling have made the full understanding of the reservoir behavior and consequently availability of data for further routine analysis and utilization of simulation model as the main way of data integration limited. Therefore, there is an emerging need to better understand the challenges surrounding production and enhanced oil recovery strategies in these reservoirs for an improved oil recovery decision making system. In this paper, the challenges in production, stimulation and enhanced oil recovery strategies in newly-developed complex carbonates are addressed and analyzed based on the changes to the chemical and mechanical environment. An integrated decision-making workflow based on coupled hydro-mechanical mechanisms in water-based EOR methods is discussed.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":"52 1","pages":"350-365"},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46361288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A Novel Flexible Lane Changing (FLC) Method in Complicated Dynamic Environment for Automated Vehicles 一种复杂动态环境下自动驾驶车辆柔性变道方法
Applied and Computational Mechanics Pub Date : 2021-04-25 DOI: 10.22055/JACM.2021.36276.2818
M. Rafat, S. Azadi
{"title":"A Novel Flexible Lane Changing (FLC) Method in Complicated Dynamic Environment for Automated Vehicles","authors":"M. Rafat, S. Azadi","doi":"10.22055/JACM.2021.36276.2818","DOIUrl":"https://doi.org/10.22055/JACM.2021.36276.2818","url":null,"abstract":"Decision making and path planning in case of highly transient dynamics of the surrounding as well as the effect of road condition are the issues that are not completely solved in the previous researches. The goal is to perform a safe and comfortable lane change that includes flexible re-planning capabilities. In this paper, a novel structure for path planning and decision making part of a vehicle automatic lane change has been introduced which comprehensively considers both longitudinal and lateral dynamics of the vehicle. The presented method is able to perform re-planning even in the middle of a lane change maneuver according to new traffic condition. Inclusion of the dynamics of all involved vehicles and providing online performance are the other advantages of the proposed system. The algorithm is simulated and various scenarios are constructed to evaluate the efficiency of the system. The results show that the system has completely acceptable performance.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45940260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Stress Mode Superposition for a Priori Detection of Highly Stressed Areas: Mode Normalisation and Loading Influence 高应力区域优先检测的应力模式叠加：模式归一化和加载影响
Applied and Computational Mechanics Pub Date : 2021-04-12 DOI: 10.22055/JACM.2021.36637.2878
Carsten Strzalka, D. Marinković, M. Zehn
{"title":"Stress Mode Superposition for a Priori Detection of Highly Stressed Areas: Mode Normalisation and Loading Influence","authors":"Carsten Strzalka, D. Marinković, M. Zehn","doi":"10.22055/JACM.2021.36637.2878","DOIUrl":"https://doi.org/10.22055/JACM.2021.36637.2878","url":null,"abstract":"From the economic and technical point of view, the reduction of development periods and required resources represent a considerable benefit. For the reduction of numerical effort and processed data in numerical stress analysis, the present paper is focused onto the investigation of an efficient method for the a priori detection of a structural component’s highly stressed areas. Based on the theory of stress mode superposition and the frequency domain solution of the decoupled equations of motion, an analytically consistent approach for a priori mode superposition is presented. In this context, the influence of multiaxial loading and mode normalisation is investigated. Validation is performed on a simplified industrial model of a twist-beam rear axle.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42416679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Potential of Semi-Empirical Heat Transfer Models in Predicting the Effects of Equivalence Ratio on Low Temperature Reaction and High Temperature Reaction Heat Release of an HCCI Engine 半经验传热模型预测等效比对HCCI发动机低温和高温反应放热影响的潜力
Applied and Computational Mechanics Pub Date : 2021-04-03 DOI: 10.22055/JACM.2020.35398.2649
M. Rabeti, O. Jahanian, A. Ranjbar, S. M. S. Ardebili, H. Solmaz
{"title":"Potential of Semi-Empirical Heat Transfer Models in Predicting the Effects of Equivalence Ratio on Low Temperature Reaction and High Temperature Reaction Heat Release of an HCCI Engine","authors":"M. Rabeti, O. Jahanian, A. Ranjbar, S. M. S. Ardebili, H. Solmaz","doi":"10.22055/JACM.2020.35398.2649","DOIUrl":"https://doi.org/10.22055/JACM.2020.35398.2649","url":null,"abstract":"In this paper, the influence of equivalence ratio on the low-temperature reaction heat release (LTR-HR) and high-temperature reaction heat release (HTR-HR) of homogeneous charge compression ignition engine has been experimentally and numerically examined. The numerical study was performed using zero-dimensional (0D) single-zone model by considering the chemical kinetic of fuel combustion. Annand, Woschni, Hohenberg, Chang (Assanis), and Hensel semi-empirical heat transfer models were employed in the 0D single-zone simulations. In this study, the in-cylinder pressure, rate of heat release, LTR-HR and HTR-HR were investigated. The Hensel heat transfer model was the only model that predicted the combustion in all of the operating conditions. The Hohenberg model properly recognized the effects of equivalence ratio changes on the HTR-HR.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43569019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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