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  • Open Access

    ARTICLE

    Numerical Simulation of Blood Flow in Aorta with Dilation: A Comparison between Laminar and LES Modeling Methods

    Lijian Xu1, Tianyang Yang2, Lekang Yin3, Ye Kong2, Yuri Vassilevski4,5, Fuyou Liang1,5,6,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 509-526, 2020, DOI:10.32604/cmes.2020.010719

    Abstract Computational modeling methods have been increasingly employed to quantify aortic hemodynamic parameters that are challenging to in vivo measurements but important for the diagnosis/treatment of aortic disease. Although the presence of turbulence-like behaviors of blood flow in normal or diseased aorta has long been confirmed, the majority of existing computational model studies adopted the laminar flow assumption (LFA) in the treatment of sub-grid flow variables. So far, it remains unclear whether LFA would significantly compromise the reliability of hemodynamic simulation. In the present study, we addressed the issue in the context of a specific aortopathy, namely aortic dilation, which is… More >

  • Open Access

    ARTICLE

    An ETD Method for American Options under the Heston Model

    Rafael Company1, Vera N. Egorova2, Lucas Jódar1,*, Ferran Fuster Valls3

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 493-508, 2020, DOI:10.32604/cmes.2020.010208

    Abstract A numerical method for American options pricing on assets under the Heston stochastic volatility model is developed. A preliminary transformation is applied to remove the mixed derivative term avoiding known numerical drawbacks and reducing computational costs. Free boundary is treated by the penalty method. Transformed nonlinear partial differential equation is solved numerically by using the method of lines. For full discretization the exponential time differencing method is used. Numerical analysis establishes the stability and positivity of the proposed method. The numerical convergence behaviour and effectiveness are investigated in extensive numerical experiments. More >

  • Open Access

    ARTICLE

    A Numerical Efficient Technique for the Solution of Susceptible Infected Recovered Epidemic Model

    Muhammad Shoaib Arif1,*, Ali Raza1,2, Kamaleldin Abodayeh3, Muhammad Rafiq4, Mairaj Bibi5, Amna Nazeer5

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 477-491, 2020, DOI:10.32604/cmes.2020.011121

    Abstract The essential features of the nonlinear stochastic models are positivity, dynamical consistency and boundedness. These features have a significant role in different fields of computational biology and many more. The aim of our paper, to achieve the comparison analysis of the stochastic susceptible, infected recovered epidemic model. The stochastic modelling is a realistic way to study the dynamics of compartmental modelling as compared to deterministic modelling. The effect of reproduction number has also observed in the stochastic susceptible, infected recovered epidemic model. For comparison analysis, we developed some explicit stochastic techniques, but they are the time-dependent techniques. The implicitly driven… More >

  • Open Access

    ARTICLE

    An Intelligent Predictive Model-Based Multi-Response Optimization of EDM Process

    N. Ganesh1, R. K. Ghadai2, A. K. Bhoi3, K. Kalita4,*, Xiao-Zhi Gao5

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 459-476, 2020, DOI:10.32604/cmes.2020.09645

    Abstract Electrical Discharge Machining (EDM) is a popular non-traditional machining process that is widely used due to its ability to machine hard and brittle materials. It does not require a cutting tool and can machine complex geometries easily. However, it suffers from drawbacks like a poor rate of machining and excessive tool wear. In this research, an attempt is made to address these issues by using an intelligent predictive model coupled global optimization approach to predict suitable combinations of input parameters (current, pulse on-time and pulse off-time) that would effectively increase the material removal rate and minimize the tool wear. The… More >

  • Open Access

    ARTICLE

    Scour Effect on Dynamic Characteristics and Responses of Offshore Wind Turbines

    Dongyue Tang1, Ming Zhao1, *

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 433-457, 2020, DOI:10.32604/cmes.2020.09268

    Abstract The monopile foundation is the main form of offshore wind turbine foundation, and its surrounding scouring pit will reduce the constraints of the soil on the piles, which makes wind turbine foundation instability a key issue affecting the structural safety of offshore wind turbines. In previous studies, the rotating rotor and control system are neglected when studying the influence of scour on the offshore wind turbine structure. In this paper, the numerical model of the blade-tower-monopile integrated offshore wind turbine is established, and the influence of scour on the dynamic characteristics of wind turbine is obtained considering parameters, such as… More >

  • Open Access

    ARTICLE

    Improving the Seismic Performance of Staircases in Building Structures with a Novel Isolator

    Yafei Zhang1,2, Ping Tan1,2,*, Haitao Ma1,2, Marco Donà1,2

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 415-431, 2020, DOI:10.32604/cmes.2020.09054

    Abstract A staircase provides the main escape way from a building in an emergency. Unfortunately, it may suffer severe damages or even collapse during an earthquake. For improving the seismic performance of staircases, this paper proposes an innovative staircase isolator with the features of lightweight, costeffective and ease of construction and replacement, which is formed by suitable engineering plastic shims between rubber layers. A connection construction scheme is also proposed for the isolated staircase. Systematic performance tests have been carried out to characterize the isolator in terms of mechanic behavior and ultimate states. The test results show that mechanical properties of… More >

  • Open Access

    EDITORIAL

    Introduction to the Special Issue Numerical Modeling and Simulation for Structural Safety and Disaster Mitigation

    Xiaodan Ren1,*, Tiancan Huang2

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 411-413, 2020, DOI:10.32604/cmes.2020.012603

    Abstract This article has no abstract. More >

  • Open Access

    ARTICLE

    Italian Validation of the Healthcare Needs Scale for Youth with Congenital Heart Disease and Its Short-Form Development

    Federica Dellafiore1, Serena Francesca Flocco1, Cristina Arrigoni2, Serena Barello3, Tiziana Nania1, Maria Giovanna Russo4, Berardo Sarubbi5, Arianna Magon1, Francesco Pittella1, Massimo Chessa6, Rosario Caruso1,*

    Congenital Heart Disease, Vol.15, No.3, pp. 167-180, 2020, DOI:10.32604/CHD.2020.012438

    Abstract Aims: This study aimed at providing an Italian short version of the ‘healthcare needs scale for youth with congenital heart disease’ (I-HNS-CHD-s), describing its construct validity and reliability. Methods: A multi-method and multi-phase design were adopted. Phase one referred to the cultural-linguistic validation of the original scale into Italian. Phase two tasted content and face validity of the Italian-translated scale. Phase three included the psychometric validation process of scale, encompassed two different steps: first cross-sectional data collection (sample A) purposed at determining the psychometric characteristics of the I-HNS-CHD-s, using an exploratory factor analysis (EFA). Then, a second round of cross-sectional… More >

  • Open Access

    EDITORIAL

    Jan Misugi in Captain Tsubasa as an Educational Example for Children with Congenital Heart Disease

    Nicolas Kluger1,2, Philippe Charlier3,4, Antonio Perciaccante3,5,*

    Congenital Heart Disease, Vol.15, No.3, pp. 163-165, 2020, DOI:10.32604/CHD.2020.012394

    Abstract Introduction: Visual narratives such as manga, comics and cartoons can play an important role in educating readers on various aspects of life including medicine and disabilities. Methods: We reviewed the animated series entitled “Captain Tsubasa”, focusing our analysis on the episodes which introduced the character Jun Misugi, a football player suffering from an unspecified congenital heart disease (CHD). Discussion: For a child with a CHD, the practice of sports could be risky but also an opportunity to improve heart function and reach personal fulfillment. CHD have an important impact on children’s quality of life, and sports participation has beneficial effects… More >

  • Open Access

    ARTICLE

    Long Term Follow-Up of Ebstein’s Anomaly—What to Expect in Adult Life?

    Tânia Branco Mano1,*, João Ferreira Reis1, Ana Figueiredo Agapito1, André Monteiro1, Mário Oliveira1, Luísa Moura Branco1, José Fragata2, Fátima Pinto3, Rui Cruz Ferreira1, Lídia de Sousa1

    Congenital Heart Disease, Vol.15, No.3, pp. 153-162, 2020, DOI:10.32604/CHD.2020.011500

    Abstract Introduction: Due to the low prevalence and wide variation of severity of Ebstein’s Anomaly (EA), long-term follow-up data are scarce. The aim was to evaluate the long-term outcome of an adult population with EA. Methods: Retrospective analysis of EA adults followed in the past 42 years in a tertiary congenital heart disease outpatient clinic. Predictors of complications and mortality were assessed. Results: We studied 53 patients: 53% females, mean age 46 ± 19 years, 36% cyanotic, 55% diagnosed at adult age. Tricuspid regurgitation was moderate or severe in 33% and 46%, respectively, and during follow-up (mean 12 ± 10… More >

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