Geunil Lee¹, Daeil Kwon^2,*

CMES-Computer Modeling in Engineering & Sciences, Vol.144, No.3, pp. 3329-3342, 2025, DOI:10.32604/cmes.2025.069402 - 30 September 2025

Abstract Nondestructive testing (NDT) methods such as visual inspection and ultrasonic testing are widely applied in manufacturing quality control, but they remain limited in their ability to detect defect characteristics. Visual inspection depends strongly on operator experience, while ultrasonic testing requires physical contact and stable coupling conditions that are difficult to maintain in production lines. These constraints become more pronounced when defect-related information is scarce or when background noise interferes with signal acquisition in manufacturing processes. This study presents a non-contact acoustic method for diagnosing defects in scroll compressors during the manufacturing process. The diagnostic approach… More >

Md Tanjil Sarker^1,*, See Wei Jing¹, Gobbi Ramasamy^1,*, Siva Priya Thiagarajah¹, Md. Golam Sadeque²

Energy Engineering, Vol.122, No.7, pp. 2891-2909, 2025, DOI:10.32604/ee.2025.065331 - 27 June 2025

Abstract Industrial processes often involve rotating machinery that generates substantial kinetic energy, much of which remains untapped. Harvesting rotational kinetic energy offers a promising solution to reduce energy waste and improve energy efficiency in industrial applications. This research investigates the potential of electromagnetic induction for harvesting rotational kinetic energy from industrial machinery. A comparative study was conducted between disk and cylinder-shaped rotational bodies to evaluate their energy efficiency under various load conditions. Experimental results demonstrated that the disk body exhibited higher energy efficiency, primarily due to lower mechanical losses compared to the cylinder body. A power… More >

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

Alexey Vjatkin^*, Svyatoslav Petukhov, Victor Kozlov

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.4, pp. 783-798, 2025, DOI:10.32604/fdmp.2025.062535 - 06 May 2025

Abstract Time-averaged thermal convection in a rotating horizontal annulus with a higher temperature at its inner boundary is studied. The centrifugal force plays a stabilizing role, while thermal convection is determined by the “thermovibrational mechanism”. Convective flow is excited due to oscillations of a non-isothermal rotating fluid. Thermal vibrational convection manifests in the form of two-dimensional vortices elongated along the axis of rotation, which develop in a threshold manner with an increase in the amplitude of fluid oscillations. The objective of the present study is to clarify the nature of another phenomenon, i.e., three-dimensional convective vortices… More >

De Rosal Ignatius Moses Setiadi^1,*, T. Sutojo¹, Supriadi Rustad¹, Muhamad Akrom¹, Sudipta Kr Ghosal², Minh T. Nguyen³, Arnold Adimabua Ojugo⁴

CMC-Computers, Materials & Continua, Vol.83, No.2, pp. 2161-2188, 2025, DOI:10.32604/cmc.2025.063729 - 16 April 2025

Abstract Data security has become a growing priority due to the increasing frequency of cyber-attacks, necessitating the development of more advanced encryption algorithms. This paper introduces Single Qubit Quantum Logistic-Sine XYZ-Rotation Maps (SQQLSR), a quantum-based chaos map designed to generate one-dimensional chaotic sequences with an ultra-wide parameter range. The proposed model leverages quantum superposition using Hadamard gates and quantum rotations along the X, Y, and Z axes to enhance randomness. Extensive numerical experiments validate the effectiveness of SQQLSR. The proposed method achieves a maximum Lyapunov exponent (LE) of ≈55.265, surpassing traditional chaotic maps in unpredictability. The bifurcation analysis… More >

Kirill Rysin^*, Alexey Vjatkin, Victor Kozlov

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.3, pp. 605-621, 2025, DOI:10.32604/fdmp.2025.061722 - 01 April 2025

Abstract Thermal vibrational convection (TVC) refers to the time-averaged convection of a non-isothermal fluid subjected to oscillating force fields. It serves as an effective mechanism for heat transfer control, particularly under microgravity conditions. A key challenge in this field is understanding the effect of rotation on TVC, as fluid oscillations in rotating systems exhibit unique and specific characteristics. In this study, we examine TVC in a vertical flat layer with boundaries at different temperatures, rotating around a horizontal axis. The distinctive feature of this study is that the fluid oscillations within the cavity are not induced… More >

See Wei Jing, Md Tanjil Sarker^*, Gobbi Ramasamy^*, Siva Priya Thiagarajah, Fazlul Aman

Energy Engineering, Vol.122, No.3, pp. 905-927, 2025, DOI:10.32604/ee.2025.058916 - 07 March 2025

Abstract Electrical energy can be harvested from the rotational kinetic energy of moving bodies, consisting of both mechanical and kinetic energy as a potential power source through electromagnetic induction, similar to wind energy applications. In industries, rotational bodies are commonly present in operations, yet this kinetic energy remains untapped. This research explores the energy generation characteristics of two rotational body types, disk-shaped and cylinder-shaped under specific experimental setups. The hardware setup included a direct current (DC) motor driver, power supply, DC generator, mechanical support, and load resistance, while the software setup involved automation testing tools and… More >

Victor Kozlov^1,*, Alsu Zimasova¹, Nikolai Kozlov²

FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.12, pp. 2693-2707, 2024, DOI:10.32604/fdmp.2024.052398 - 23 December 2024

Abstract The behavior of a viscous liquid film on the wall of a rapidly rotating cylinder subjected to angular vibrations is experimentally studied. The cavity is filled with an immiscible low-viscosity liquid of lower density. In the absence of vibrations, the high viscosity liquid covers the inner surface of the cylinder with a relatively thin axisymmetric film; the low-viscosity liquid is located in the cavity interior. It is found that with an increase in the amplitude of rotational vibrations, the axisymmetric interphase boundary loses stability. An azimuthally periodic 2D “frozen wave” appears on the film surface… More >

Ching-Chi Hsu^1,*, Hsin-Hao Lin¹, Kao-Shang Shih²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.31, No.3, pp. 1-2, 2024, DOI:10.32604/icces.2024.011792

Abstract Decompression surgery is one of the useful methods to relieve the pressure on the spinal cord and nerves [1]. In computational simulation, various bone material modelling strategies have been used to model cortical bone and cancellous bone of spinal vertebrae [2,3]. However, the effects of the bone material modelling strategies on the biomechanics of the thoracolumbar spine are unclear. Thus, this study aimed to investigate the biomechanics of the thoracolumbar spine with various bone modelling strategies using a patient-specific finite element modelling technique.
Three-dimensional finite element models of the human thoracolumbar spine were developed from the… More >

Alexei Vjatkin^*, Svyatoslav Petukhov, Victor Kozlov

FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.11, pp. 2475-2488, 2024, DOI:10.32604/fdmp.2024.052377 - 28 October 2024

Abstract A genuine technological issue–the thermal convection of liquid in a rotating cavity–is investigated experimentally. The experiments are conducted within a horizontal annulus with isothermal boundaries. The inner boundary of the annulus has a higher temperature, thus exerting a stabilising influence on the system. It is shown that when the layer rotation velocity diminishes, two-dimensional azimuthally periodic convective rolls, rotating together with the cavity, emerge in a threshold manner. The development of convection is accompanied by a significant intensification of heat transfer through the layer. It is shown that the averaged thermal convection excitation in the… More > Graphic Abstract