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  • Open Access

    ARTICLE

    Directional Explosion of Finite Volume Water Confined in a Single-End-Opened CNT

    Jiahao Liu1,#, Yuanyuan Kang2,#, Kun Cai2,*, Haiyan Duan1, Jiao Shi3,*

    CMC-Computers, Materials & Continua, Vol.84, No.2, pp. 2573-2586, 2025, DOI:10.32604/cmc.2025.066249 - 03 July 2025

    Abstract The directional explosion behavior of finite volume water confined within nanochannels holds considerable potential for applications in precision nanofabrication and bioengineering. However, precise control of nanoscale mass transfer remains challenging in nanofluidics. This study examined the dynamic evolution of water clusters confined within a single-end-opened carbon nanotube (CNT) under pulsed electric field (EF) excitation, with a particular focus on the structural reorganization of hydrogen bond (H-bond) networks and dipole orientation realignment. Molecular dynamics simulations reveal that under the influence of pulsed EF, the confined water molecules undergo cooperative restructuring to maximize hydrogen bond formation through… More > Graphic Abstract

    Directional Explosion of Finite Volume Water Confined in a Single-End-Opened CNT

  • Open Access

    ARTICLE

    Numerical Study on Hemodynamic Characteristics and Distribution of Oxygenated Flow Associated with Cannulation Strategies in Veno-Arterial Extracorporeal Membrane Oxygenation Support

    Da Li1, Yuqing Tian1, Chengxin Weng2,3, Fuyou Liang1,4,5,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.143, No.3, pp. 2867-2882, 2025, DOI:10.32604/cmes.2025.066444 - 30 June 2025

    Abstract Veno-arterial extracorporeal membrane oxygenation (VA-ECMO) is a life support intervention for patients with refractory cardiogenic shock or severe cardiopulmonary failure. However, the choice of cannulation strategy remains contentious, partly due to insufficient understanding of hemodynamic characteristics associated with the site of arterial cannulation. In this study, a geometrical multiscale model was built to offer a mathematical tool for addressing the issue. The outflow cannula of ECMO was inserted into the ascending aorta in the case of central cannulation, whereas it was inserted into the right subclavian artery (RSA) or the left iliac artery (LIA) in… More >

  • Open Access

    ARTICLE

    A Neural ODE-Enhanced Deep Learning Framework for Accurate and Real-Time Epilepsy Detection

    Tawfeeq Shawly1,2, Ahmed A. Alsheikhy3,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.143, No.3, pp. 3033-3064, 2025, DOI:10.32604/cmes.2025.065264 - 30 June 2025

    Abstract Epilepsy is a long-term neurological condition marked by recurrent seizures, which result from abnormal electrical activity in the brain that disrupts its normal functioning. Traditional methods for detecting epilepsy through machine learning typically utilize discrete-time models, which inadequately represent the continuous dynamics of electroencephalogram (EEG) signals. To overcome this limitation, we introduce an innovative approach that employs Neural Ordinary Differential Equations (NODEs) to model EEG signals as continuous-time systems. This allows for effective management of irregular sampling and intricate temporal patterns. In contrast to conventional techniques, such as Convolutional Neural Networks (CNNs) and Recurrent Neural… More >

  • Open Access

    ARTICLE

    Experimental and Peridynamic Numerical Study on the Opening Process of the Soft PSD in Pulse Solid Rocket Motors

    Wenxia Cheng1, Qinliu Cao1, Bin Yuan1, Jiale Yan2,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.143, No.3, pp. 3197-3214, 2025, DOI:10.32604/cmes.2025.065041 - 30 June 2025

    Abstract As a critical component of pulse solid rocket motors (SRMs), the soft pulse separation device (PSD) is vital in enabling multi-pulse propulsion and has become a breakthrough in SRM engineering applications. To investigate the opening performance of the PSD, an axial PSD incorporating a star-shaped prefabricated defect was designed. The opening process was simulated using peridynamics, yielding the strain field distribution and the corresponding failure mode. A single-opening verification test was conducted. The simulation results showed good agreement with the experimental data, demonstrating the reliability of the peridynamic modeling approach. Furthermore, the effects of the… More >

  • Open Access

    ARTICLE

    Relevant Fluid Dynamics Aspects of the Internal Ballistics in a Small-Scale Hybrid Thruster

    Sergio Cassese1, Riccardo Guida2,3,*, Daniele Trincone1, Stefano Mungiguerra1, Raffaele Savino1

    FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1299-1337, 2025, DOI:10.32604/fdmp.2025.065605 - 30 June 2025

    Abstract Robust numerical tools are essential for enabling the use of hybrid rocket engines (HREs) in future space applications. In this context, Computational Fluid Dynamics (CFD) transient simulations can be employed to analyse and predict relevant fluid dynamics phenomena within the thrust chamber of small-scale HREs. This work applies such techniques to investigate two unexpected behaviours observed in a 10 N-class hydrogen peroxide-based hybrid thruster: an uneven regression rate during High-Density Polyethylene (HDPE) and Acrylonitrile Butadiene Styrene (ABS) fuel tests, and non-negligible axial consumption in the ABS test case. The present study seeks to identify their… More >

  • Open Access

    ARTICLE

    Enhancing Hydrothermal Performance of Dimpled Tubes: Investigating the Impact of Different Dimple Sizes and Distribution along the Tube

    Basima Salman Khalaf*, Abeer H. Falih, Basim Freegah

    Frontiers in Heat and Mass Transfer, Vol.23, No.3, pp. 943-956, 2025, DOI:10.32604/fhmt.2025.065366 - 30 June 2025

    Abstract The main purpose of this research is to optimize the hydrothermal performance of a dimpled tube by augmenting the surface area for heat transmission and thermal layer cracking. To achieve that, the impact of different dimple diameters and their distribution along the dimpled tube was investigated numerically using the ANSYS Fluent 2022 R1 software by considering two models, A and B. Both models consist of three regions; the first, second, and third have dimple diameters of 3, 2, & 1 mm, respectively. Model A included an in-line dimple arrangement, while model B involved a staggered… More >

  • Open Access

    ARTICLE

    Numerical Analysis of the Aerodynamic Performance of an Ahmed Body Fitted with Spoilers of Different Opening Areas

    Haichao Zhou*, Wei Zhang, Tinghui Huang, Haoran Li

    FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1113-1131, 2025, DOI:10.32604/fdmp.2025.064991 - 30 May 2025

    Abstract The configuration of a spoiler plays a crucial role in the aerodynamics of a vehicle. In particular, investigating the impact of spoiler design on aerodynamic performance is essential for effectively reducing drag and optimizing efficiency. This study focuses on the 35° Ahmed body as the test model and examines six different spoiler types mounted on its slant surface. Using the Lattice Boltzmann Method (LBM) in XFlow and the Large Eddy Simulation (LES) technique, the aerodynamic effects of these spoilers were analyzed. The numerical approach was validated against published experimental data. Results indicate that aerodynamic drag More >

  • Open Access

    ARTICLE

    Analytical Investigation of MFD Viscosity and Ohmic Heating in MHD Boundary Layers of Jeffrey Fluid

    K. Sinivasan1, N. Vishnu Ganesh1,*, G. Hirankumar2, M. Al-Mdallal Qasem3,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1029-1049, 2025, DOI:10.32604/fdmp.2025.064503 - 30 May 2025

    Abstract In this study, an analytical investigation is carried out to assess the impact of magnetic field-dependent (MFD) viscosity on the momentum and heat transfers inside the boundary layer of a Jeffrey fluid flowing over a horizontally elongating sheet, while taking into account the effects of ohmic dissipation. By applying similarity transformations, the original nonlinear governing equations with partial derivatives are transformed into ordinary differential equations. Analytical expressions for the momentum and energy equations are derived, incorporating the influence of MFD viscosity on the Jeffrey fluid. Then the impact of different parameters is assessed, including magnetic More >

  • Open Access

    ARTICLE

    Effect of Libration on Fluid Flow and Granular Medium Dynamics in a Rotating Cylindrical Annulus

    Denis Polezhaev*, Alexey Vjatkin, Victor Kozlov

    FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1051-1061, 2025, DOI:10.32604/fdmp.2025.062000 - 30 May 2025

    Abstract The dynamics of fluid and non-buoyant particles in a librating horizontal annulus is studied experimentally. In the absence of librations, the granular material forms a cylindrical layer near the outer boundary of the annulus and undergoes rigid-body rotation with the fluid and the annulus. It is demonstrated that the librational liquefaction of the granular material results in pattern formation. This self-organization process stems from the excitation of inertial modes induced by the oscillatory motion of liquefied granular material under the influence of the gravitational force. The inertial wave induces vortical fluid flow which entrains particles More > Graphic Abstract

    Effect of Libration on Fluid Flow and Granular Medium Dynamics in a Rotating Cylindrical Annulus

  • Open Access

    ARTICLE

    Analytical Solutions for 1-Dimensional Peridynamic Systems by Considering the Effect of Damping

    Zhenghao Yang1, Erkan Oterkus2,*, Selda Oterkus2, Konstantin Naumenko1

    CMES-Computer Modeling in Engineering & Sciences, Vol.143, No.2, pp. 2491-2508, 2025, DOI:10.32604/cmes.2025.062998 - 30 May 2025

    Abstract For the solution of peridynamic equations of motion, a meshless approach is typically used instead of utilizing semi-analytical or mesh-based approaches. In contrast, the literature has limited analytical solutions. This study develops a novel analytical solution for one-dimensional peridynamic models, considering the effect of damping. After demonstrating the details of the analytical solution, various demonstration problems are presented. First, the free vibration of a damped system is considered for under-damped and critically damped conditions. Peridynamic solutions and results from the classical theory are compared against each other, and excellent agreement is observed between the two More >

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