Chinese Journal of Physics最新文献

{"title":"Application of computational fluid dynamics and physics informed neural networks in predicting rupture risk of thoracoabdominal aneurysms with fluid-structure interaction analysis","authors":"M. Abaid Ur Rehman ,&nbsp;Özgür Ekici ,&nbsp;M. Asif Farooq ,&nbsp;Rashid M. Talha ,&nbsp;Sadaf Amir","doi":"10.1016/j.cjph.2025.02.015","DOIUrl":"10.1016/j.cjph.2025.02.015","url":null,"abstract":"<div><div>An aneurysm’s rupture is often linked to its maximum diameter, but biomechanical studies highlight the crucial role of hemodynamic factors, such as blood flow pattern and pressure within the blood vessel, in this process. This study investigates six cases, exploring both axisymmetric (fusiform) and asymmetric (saccular) aneurysm shapes while maintaining a consistent aneurysm diameter and varying the bulge shape factor to induce asymmetry. Hemodynamic factors, including wall shear stress (WSS), wall shear stress gradient (WSSG), and von Mises stress distributions, are computed under both laminar and turbulent flow conditions, reflecting the diastolic and systolic phases, respectively. Our results reveal that recirculation zones, particularly prominent in asymmetric cases, generate vortices within the aneurysm, increasing blood residence time and the likelihood of thrombus formation. Thrombus formation can impede blood flow, raising the risk of embolism or ischemic events. Rupture occurs when WSS exceeds tissue strength, and our findings suggest that rupture risk varies with aneurysm asymmetry. Specifically, hemodynamic factors are more severe in turbulent cases, with the highest values observed in case 2-T, an asymmetric aneurysm with a significant posterior bulge. This case also shows the highest rupture risk, indicated by elevated WSS, WSSG, and von Mises stress, particularly on the anterior side, towards the distal end of the thoracic aortic aneurysm. At this location, the high WSS and WSSG indicate intense fluctuations and flow disturbances, while von Mises stress is also significantly elevated, further increasing the likelihood of rupture. Additionally, we used a synergistic approach that integrates Computational Fluid Dynamics (CFD) with Physics-Informed Neural Networks (PINNs) to compare pressure and velocity distributions along the medial and transverse planes, demonstrating strong agreement. A novel aspect of this study lies in its comprehensive analysis of thoracoabdominal aneurysms, accounting for the influence of aneurysm asymmetry on WSS, WSSG, and von Mises stress. Additionally, both laminar and turbulent flow conditions are explored to reflect the diastolic and systolic phases, respectively.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 433-454"},"PeriodicalIF":4.6,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of exercise body conditions on hemodynamics of blood flow in saccular ICA aneurysms: Pre- and post-stent-induced deformation","authors":"Chun Ze Ji ,&nbsp;Bowen Wei","doi":"10.1016/j.cjph.2025.02.027","DOIUrl":"10.1016/j.cjph.2025.02.027","url":null,"abstract":"<div><div>Intracranial aneurysms, particularly those located in the internal carotid artery (ICA), present a significant risk of rupture due to abnormal blood flow dynamics. The application of endovascular stents has become a common intervention to modify the flow in these aneurysms. However, the impact of stent-induced deformation on hemodynamics under varying physiological body conditions remains understudied. This work investigates the effects of rest and exercise conditions on blood flow patterns within saccular ICA aneurysms, both before and after stent placement. Computational fluid dynamics (CFD) simulations were performed using patient-specific aneurysm geometries to quantify changes in flow velocity, wall shear stress (WSS), and oscillatory shear index (OSI). The study demonstrates that exercise induces higher flow velocities and increased WSS, potentially elevating rupture risks pre-stenting. Poststent insertion, we observed reduced flow velocities and improved stabilization of hemodynamic parameters, although the extent of deformation plays a critical role in these outcomes. Understanding how physiological conditions influence hemodynamics in stented and non-stented aneurysms may guide personalized treatment approaches and enhance stent design to improve patient outcomes.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 391-403"},"PeriodicalIF":4.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biomechanical analysis of cilia-induced liquid propulsion in rough porous passageway under magnetic field control: MATLAB- and Mathematica-based simulations","authors":"Zeeshan Asghar ,&nbsp;Muhammad Waris Saeed Khan ,&nbsp;Abeer Alhashash ,&nbsp;Muhammad Asif Gondal","doi":"10.1016/j.cjph.2025.02.028","DOIUrl":"10.1016/j.cjph.2025.02.028","url":null,"abstract":"<div><div>Biological processes like mucus movement in the respiratory tract, circulation of cerebrospinal liquid, and sperm cell propulsion all rely on cilia-driven flow. Understanding the importance of the cilia-driven flow of generalized Newtonian fluid with surface roughness is critical for determining the biomechanics of these mechanisms and their consequences for several kinds of diseases. Motivated by these important applications, this article aims to examine the impact of surface roughness along with magnetic field inside horizontal passage using the Carreau–Yasuda (C.Y) model. Moreover, the effect of the porous medium is also considered. The flow equations are developed using the lubrication approximation. The MATLAB bvp5c and Mathematica NDSolve are utilized to solve boundary value problems. The validation of the numerical approach is made with a limiting case. The impact of various parameters on streamlines, velocity, and pressure gradient are shown graphically. This analysis reveals that surface roughness, magnetic field, and porous medium strongly impact streamline topologies, velocity, and pressure gradient. For accuracy, surface roughness plays a crucial role in developing various medical devices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 455-475"},"PeriodicalIF":4.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase transitions in car-following model integrating the comprehensive deviations collaboration effect under V2X environment","authors":"Guanghan Peng ,&nbsp;Chunli Luo ,&nbsp;Huili Tan","doi":"10.1016/j.cjph.2025.02.024","DOIUrl":"10.1016/j.cjph.2025.02.024","url":null,"abstract":"<div><div>Based on cyber physical systems, a novel car-following model is raised by integrating the comprehensive deviations collaboration effect (CDCE) including headway and speed under V2X environment. The CDCE is intimately connected to the stability condition and mKdV equations through theoretical analysis, which shows that the CDCE effectively promotes the stability of traffic flow. Moreover, the headway variation and the hysteresis loop in traffic system are gradually decreasing owing to amplifying the CDCE through simulation, which reveals that the CDCE greatly alleviates traffic congestion. More importantly, we build a new energy consumption model to investigate the CDCE model. It is found that the CDCE can significantly reduce energy consumption due to cooperating with the CDCE of headway and speed under V2X environmenton.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 789-797"},"PeriodicalIF":4.6,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the thermal dynamics of two-layered immiscible fluids in corrugated curved channel with applied heat source","authors":"Nomana Abid,&nbsp;Jafar Hasnain","doi":"10.1016/j.cjph.2025.02.019","DOIUrl":"10.1016/j.cjph.2025.02.019","url":null,"abstract":"<div><div>The corrugated curved channels (CCs) in heat exchangers can enhance the heat transfer where two immiscible fluids are used, by promoting interfacial areas. The results of this study may inspire creative designs for thermal management systems, which could result in the creation of new applications and technology. The corrugations improve the energy collection and conversion efficiency. In solar thermal collectors, a heat source in corrugated curved channels is used to improve solar energy absorption to transfer it to a working fluid. On the other hand, the heat sinks are used to remove the heat that is not needed during the chemical separation processes. With this motivation, the main aim of this study is to analyze the heat transfer enhancement in two-layered immiscible viscous fluids (VFs) flow by using the heat source/sink phenomenon. The curved channel is divided into two regions. Both regions are occupied with VFs having different viscosities. The flow is caused by a constant pressure gradient. The analytical expressions for velocity and temperature are obtained through the perturbation series method (in terms of small corrugation amplitude <span><math><mrow><mrow><mi>ε</mi></mrow><mo>≪</mo><mn>1</mn></mrow></math></span>) by solving the mathematical model of partial differential equations. The effect of different parameters on fluid and heat flow is analyzed through graphs and contours. Moreover, the shear stresses (SS) at the walls of CC with corrugated boundaries, rate of heat transport and volume flow rate (VFR) are also analyzed and discussed. The results show that the heat is more enhanced when a heat source is provided to the system whereas a heat sink causes a fall in heat through the immiscible VFs flow. So, to enhance the heat when necessary, a heat source can be used in corrugated CC. Furthermore, SS is decreased when the wavenumber is increased. The wavenumber implies a small corrugation wavelength which leads to a more undulating path. For this type of path, a larger amount of SS is needed for fluid to flow at walls.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 190-204"},"PeriodicalIF":4.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A front-fixing method for the nonlinear and coupled phase change model in a moving domain","authors":"Jaya Joshi,&nbsp;Rajeev","doi":"10.1016/j.cjph.2025.02.013","DOIUrl":"10.1016/j.cjph.2025.02.013","url":null,"abstract":"<div><div>This study presents a mathematical model for a sublimation problem in a two-phase region which involves temperature and concentration-dependent thermophysical properties to investigate the temperature distribution and mass density in both regions. The numerical solution to the problem is acquired by employing a front-fixing explicit finite difference method. The consistency and stability of the numerical scheme are theoretically analyzed. The accuracy of the presented method is validated through a comparison with the exact solution achieved in a particular case and it is identified that current results are sufficiently near to them. The consequences of different dimensionless parameters on temperature and sublimation curve are presented graphically. The findings from this study provide some ways to accelerate the speed of phase transition with minimal energy absorption of particles during the sublimation process.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 29-43"},"PeriodicalIF":4.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced electrotunable linear polarization rotator with high degree of linear polarization using dye-doped 90°-twisted nematic liquid crystals","authors":"Yi-Xuan Liu ,&nbsp;Pravinraj Selvaraj ,&nbsp;Chi-Tang Huang,&nbsp;Yu-Hsiang Tseng,&nbsp;Wei-Hao Chen,&nbsp;Ching-Cherng Sun,&nbsp;Ko-Ting Cheng","doi":"10.1016/j.cjph.2025.02.020","DOIUrl":"10.1016/j.cjph.2025.02.020","url":null,"abstract":"<div><div>Considerable attention has been allotted to the generation and manipulation of polarization light due to its unique optical properties and potential applications. Nevertheless, existing polarization rotators are limited in their capability to provide continuous linear polarization rotation and maintain a high degree of linear polarization (DoLP) via electric stimuli, and this condition is severely inherent in their system design flexibility. In this study, we enhance the performance of a continuously electrotuneable linear polarization rotator by utilizing dye-doped 90°-twisted nematic liquid crystals (90°-TNLCs). Despite a slight decrease in light intensity under an electric stimulus, the polarization rotators maintain a consistently high DoLP due to the dichroic dye's absorption anisotropy and the selective absorption of elliptically polarized transmitted light along the short axis. This mechanism effectively migrated the degradation of DoLP. Additionally, we investigated the comparative absorption characteristics between 90°-twisted nematic and homogeneous alignment LCs. This pioneering innovation offers unprecedented versatility in linear polarization control, which paves the way for advanced application in polarization modulation technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 205-211"},"PeriodicalIF":4.6,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase-modulated quantum routing with a giant atom","authors":"Shu-Qing Mo ,&nbsp;Guo-An Yan ,&nbsp;Hua Lv","doi":"10.1016/j.cjph.2025.02.010","DOIUrl":"10.1016/j.cjph.2025.02.010","url":null,"abstract":"<div><div>The coupling between giant atoms and waveguides is of great significance in quantum information science. We utilize a giant atom coupled with two waveguides to achieve a highly efficient, secure, and directional addressing quantum routing scheme. By adjusting the phases, single-photon transmission rates with high efficiencies can be obtained. Moreover, a potential implementing platform for our theoretical scheme is proposed based on the superconducting circuit. The feasibility of the proposed platform is confirmed by careful numerical selection and analysis. We hope that the research can potentially contribute to the development of future quantum networks.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 44-52"},"PeriodicalIF":4.6,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluid modeling of the atmospheric pressure helium direct current microdischarge coupled with the two-term Boltzmann equation","authors":"Ying Wang ,&nbsp;Ye Tian ,&nbsp;K.M. Rabadanov ,&nbsp;A.A. Kudryavtsev ,&nbsp;Chengxun Yuan","doi":"10.1016/j.cjph.2025.02.018","DOIUrl":"10.1016/j.cjph.2025.02.018","url":null,"abstract":"<div><div>We examine the Space-Dependent Electron Energy Distribution Function model coupled with plasma fluid equation for atmospheric pressure direct current microdischarge in helium. The simulation were performed in COMSOL Multiphysics using Plasma Module. In the model, the Boltzmann equation in the classical two-term approximation is solved for each position of the discharge region and is coupled with the plasma fluid equations by way of the electron mean energy. Utilizing initial data derived from the Boltzmann equation solution, the rate constants and transport coefficients are computed, which are used in the fluid model, thus closing the computational loop. To validate this approach, we compare simulation results with both the outcomes of the “local mean energy approximation” model and experimental data. Here we show that simulation results exhibit good agreement with experimental results, underscoring the fidelity of using coupled computational approach. Furthermore, disparities between using here the Space-Dependent Electron Energy Distribution Function model and the “local mean energy approximation” model highlight the importance of considering self-consistent computational approaches in atmospheric pressure microdischarge modeling and analysis.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 298-305"},"PeriodicalIF":4.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A thermodynamic model for dark energy including particle creation or destruction processes","authors":"José Medeiros da Costa Netto,&nbsp;Heydson Henrique Brito da Silva","doi":"10.1016/j.cjph.2025.02.007","DOIUrl":"10.1016/j.cjph.2025.02.007","url":null,"abstract":"<div><div>Thermodynamic analyses of dark energy as a relativistic fluid indicates that this intriguing component of the universe mimics a bulk viscous pressure when the parameter of its barotropic equation of state varies with time. Since in cosmology bulk viscosity and creation or destruction of matter are closely linked processes, we propose in this work a brief thermodynamic study of dark energy considering that particles can be created or destroyed in the fluid. We derive new expressions for quantities such as particle density, entropy density etc. that have been shown to be sensitive to this new ingredient. We also obtain new thermodynamic constraints and compare them with those where the number of particles is conserved. In particular, we found that in the presence of a sink, dark energy tends towards the cosmological constant over time regardless of the sign of its chemical potential and without violating the laws of thermodynamics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 684-689"},"PeriodicalIF":4.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}