This paper is concerned with the computational results of two-dimensional axisymmetric rigid and elastic wall formulation. In this paper, steady flow in a stenotic vessel is simulated and compared to available numeric...This paper is concerned with the computational results of two-dimensional axisymmetric rigid and elastic wall formulation. In this paper, steady flow in a stenotic vessel is simulated and compared to available numerical data with COMSOL Multiphysics software. Numerical results for a 2D axisymmetric vessel of 45% area reduction indicate that as the area is reduced with the decreasing of cross-section, the maximum axial velocity at post stenotic decreases until the end of the artery but the radial velocity increases upto 4 mm from the stenosis throat and then decreases. Overall, comparison is carried out on hemodynamics for elastic and rigid wall of steady flow. Our investigated findings may enable risk factor for patients with attacked cardiovascular diseases and can play an important role to detect a solution to such kinds of diseases.展开更多
Understanding the structural response of Autonomous Underwater Vehicles(AUVs)during water entry is essential for ensuring operational safety and reliability.This paper introduces a bidirectional fluid-structure coupli...Understanding the structural response of Autonomous Underwater Vehicles(AUVs)during water entry is essential for ensuring operational safety and reliability.This paper introduces a bidirectional fluid-structure coupling numerical algorithm to analyze the structural response characteristics of an AUV during water entry at various speeds and angles.The numerical method’s accuracy is verified through experimental data.The investigation focuses on the water entry process within the velocity range of 50 to 200 m/s and entry angles between 60°and 90°.The study examines the influence of structural position,entry velocity,and entry angle on the structural response,while analyzing stress and strain at specific locations on the circular end face,cylindrical side,and circular tail surface of the AUV.The findings demonstrate that at entry speeds exceeding 100 m/s,the structure undergoes strain,with entry velocity exhibiting a more pronounced effect on axial force compared with entry angle.A reduced entry angle decreases the initial water contact duration and minimizes stress concentration.These results provide significant theoretical foundations for AUV structural design.展开更多
This study addresses the optimization of automated yarn handling in textile manufacturing by examining the related suction process through a combined numerical and experimental approach.In particular,a three-dimension...This study addresses the optimization of automated yarn handling in textile manufacturing by examining the related suction process through a combined numerical and experimental approach.In particular,a three-dimensional model of the suction nozzle was coupled with an equivalent linear-elastic beam representation of the yarn,and a Fluent-IDW-Abaqus weakly coupled fluid-structure interaction(FSI)framework was employed to capture the yarn’s release and dynamic response under negative-pressure suction.High-speed imaging experiments validated the simulations,demonstrating excellent agreement in displacements and velocities.According to the results,increasing the initial suction pressure from -0.04 MPa to -0.06 MPa reduces adsorption time by approximately 62% and markedly dampens yarn-end vibrations,enhancing suction performance.Pressures beyond -0.06 MPa,however,induce overshoot and nozzle collisions,increasing the risk of entanglement and mechanical damage.The outcomes of a statistical analysis are also presented to further quantify the interplay among energy consumption,suction efficiency,and operational success under varying pressures,thereby providing a rigorous foundation for the optimal selection of pressure parameters in automated yarn-handling systems.展开更多
Fluid-structure interaction(FSI)plays a critical role in civil engineering applications,directly influencing structural safety,resilience,and performance.However,the inherent multiphysics complexity of FSI problems pr...Fluid-structure interaction(FSI)plays a critical role in civil engineering applications,directly influencing structural safety,resilience,and performance.However,the inherent multiphysics complexity of FSI problems presents significant challenges for numerical modeling,particularly under highly dynamic flow conditions.This study presents a fully Lagrangian mesh-free framework for FSI based on the moving particle semi-implicit(MPS)method.The approach couples an enhanced weakly compressible MPS(WC-MPS)fluid solver with a hybrid total-updated Lagrangian(TL-UL)MPS formulation for elastic solids.In the solid phase,strains are evaluated in the reference configuration,while momentum balance is enforced in the current configuration,ensuring consistency under large deformations.The framework incorporates corrected kernel gradients and rotationally consistent particle interactions to suppress spurious zero-energy modes.The fluid solver includes artificial density diffusion and particle regularization to enhance stability and pressure smoothness.Stable and conservative coupling between phases is achieved through a normal-flux-based interface treatment combined with a velocity-consistent particle-grouping strategy.Furthermore,an improved interface particle registration criterion is introduced to ensure accurate and efficient boundary detection at deforming interfaces.The current implementation and validation of the proposed framework are restricted to two-dimensional(2D)FSI scenarios.The framework is validated against four benchmark problems:the dynamic response of a cantilever beam,dam-break flow,the Turek-Hron FSI benchmark(flow around a flexible flag),and a dam-break flow interacting with an elastic gate.The results show strong agreement with analytical,experimental,and numerical references,demonstrating the robustness and stability of the formulation for hydro-elastic interactions.Ultimately,the framework provides a simple,unified,and reliable tool for simulating large-deformation FSI problems in a fully Lagrangian context.展开更多
This paper presents a simplified design tool based on semi-analytical formulations to investigate the dynamic response of an immersed composite cylinder subjected to a far-field underwater explosion.The cylinder is si...This paper presents a simplified design tool based on semi-analytical formulations to investigate the dynamic response of an immersed composite cylinder subjected to a far-field underwater explosion.The cylinder is simply supported,fully submerged and filled with air inside.A classical shell theory using a Double Fourier series solution combined with the first-order Doubly Asymptotic Approximation(DAA1)formulation is adapted to model the fluid-structure interaction.An explicit non-standard finite difference scheme is applied to solve the coupled differential equations in time domain.The validity of DAA1 model is established by comparing the LS-DYNA/USA finite element results with existing experimental data from the literature.Then the proposed semi-analytical solutions are compared to the LS-DYNA/USA results,showing good correlation with a discrepancy of 7%for peak deflections and±9%for maximum stresses at the stand-off point for cylinders with relatively small length over radius ratios.Parametric studies examining the effect of different loading conditions,areal masses,and material configurations reveal that a large charge mass located far from the composite panel turns out to be more damaging than a small mass located nearby due to a broader pressure-time profile.Finally,the proposed model demonstrates a significant reduction in computation time,being approximately 30 times faster than its numerical counterpart,LS-DYNA/USA,making it a valuable tool for the preliminary design stages.展开更多
摘要This paper is concerned with the computational results of two-dimensional axisymmetric rigid and elastic wall formulation. In this paper, steady flow in a stenotic vessel is simulated and compared to available numerical data with COMSOL Multiphysics software. Numerical results for a 2D axisymmetric vessel of 45% area reduction indicate that as the area is reduced with the decreasing of cross-section, the maximum axial velocity at post stenotic decreases until the end of the artery but the radial velocity increases upto 4 mm from the stenosis throat and then decreases. Overall, comparison is carried out on hemodynamics for elastic and rigid wall of steady flow. Our investigated findings may enable risk factor for patients with attacked cardiovascular diseases and can play an important role to detect a solution to such kinds of diseases.
基金supported by the National Natural Science Foundation of China(Grant Nos.U21B2055,U2341285,and 52171324).
摘要Understanding the structural response of Autonomous Underwater Vehicles(AUVs)during water entry is essential for ensuring operational safety and reliability.This paper introduces a bidirectional fluid-structure coupling numerical algorithm to analyze the structural response characteristics of an AUV during water entry at various speeds and angles.The numerical method’s accuracy is verified through experimental data.The investigation focuses on the water entry process within the velocity range of 50 to 200 m/s and entry angles between 60°and 90°.The study examines the influence of structural position,entry velocity,and entry angle on the structural response,while analyzing stress and strain at specific locations on the circular end face,cylindrical side,and circular tail surface of the AUV.The findings demonstrate that at entry speeds exceeding 100 m/s,the structure undergoes strain,with entry velocity exhibiting a more pronounced effect on axial force compared with entry angle.A reduced entry angle decreases the initial water contact duration and minimizes stress concentration.These results provide significant theoretical foundations for AUV structural design.
摘要This study addresses the optimization of automated yarn handling in textile manufacturing by examining the related suction process through a combined numerical and experimental approach.In particular,a three-dimensional model of the suction nozzle was coupled with an equivalent linear-elastic beam representation of the yarn,and a Fluent-IDW-Abaqus weakly coupled fluid-structure interaction(FSI)framework was employed to capture the yarn’s release and dynamic response under negative-pressure suction.High-speed imaging experiments validated the simulations,demonstrating excellent agreement in displacements and velocities.According to the results,increasing the initial suction pressure from -0.04 MPa to -0.06 MPa reduces adsorption time by approximately 62% and markedly dampens yarn-end vibrations,enhancing suction performance.Pressures beyond -0.06 MPa,however,induce overshoot and nozzle collisions,increasing the risk of entanglement and mechanical damage.The outcomes of a statistical analysis are also presented to further quantify the interplay among energy consumption,suction efficiency,and operational success under varying pressures,thereby providing a rigorous foundation for the optimal selection of pressure parameters in automated yarn-handling systems.
基金by Fonds de recherche du Quebec—Nature et technologies(FRQNT)through the strategic research network CEISCE(Centre d’etudes interuniversitaire des structures sous charges extremes)the Canada Research Chairs(CRC)Program.
摘要Fluid-structure interaction(FSI)plays a critical role in civil engineering applications,directly influencing structural safety,resilience,and performance.However,the inherent multiphysics complexity of FSI problems presents significant challenges for numerical modeling,particularly under highly dynamic flow conditions.This study presents a fully Lagrangian mesh-free framework for FSI based on the moving particle semi-implicit(MPS)method.The approach couples an enhanced weakly compressible MPS(WC-MPS)fluid solver with a hybrid total-updated Lagrangian(TL-UL)MPS formulation for elastic solids.In the solid phase,strains are evaluated in the reference configuration,while momentum balance is enforced in the current configuration,ensuring consistency under large deformations.The framework incorporates corrected kernel gradients and rotationally consistent particle interactions to suppress spurious zero-energy modes.The fluid solver includes artificial density diffusion and particle regularization to enhance stability and pressure smoothness.Stable and conservative coupling between phases is achieved through a normal-flux-based interface treatment combined with a velocity-consistent particle-grouping strategy.Furthermore,an improved interface particle registration criterion is introduced to ensure accurate and efficient boundary detection at deforming interfaces.The current implementation and validation of the proposed framework are restricted to two-dimensional(2D)FSI scenarios.The framework is validated against four benchmark problems:the dynamic response of a cantilever beam,dam-break flow,the Turek-Hron FSI benchmark(flow around a flexible flag),and a dam-break flow interacting with an elastic gate.The results show strong agreement with analytical,experimental,and numerical references,demonstrating the robustness and stability of the formulation for hydro-elastic interactions.Ultimately,the framework provides a simple,unified,and reliable tool for simulating large-deformation FSI problems in a fully Lagrangian context.
基金supported by French Defense Innovation Agency(AID-DGA)(Grant No.ANR-21-ASM2-0002-02)in the framework of the Astrid Maturation SUCCESS+project,a collaborative French research project.
摘要This paper presents a simplified design tool based on semi-analytical formulations to investigate the dynamic response of an immersed composite cylinder subjected to a far-field underwater explosion.The cylinder is simply supported,fully submerged and filled with air inside.A classical shell theory using a Double Fourier series solution combined with the first-order Doubly Asymptotic Approximation(DAA1)formulation is adapted to model the fluid-structure interaction.An explicit non-standard finite difference scheme is applied to solve the coupled differential equations in time domain.The validity of DAA1 model is established by comparing the LS-DYNA/USA finite element results with existing experimental data from the literature.Then the proposed semi-analytical solutions are compared to the LS-DYNA/USA results,showing good correlation with a discrepancy of 7%for peak deflections and±9%for maximum stresses at the stand-off point for cylinders with relatively small length over radius ratios.Parametric studies examining the effect of different loading conditions,areal masses,and material configurations reveal that a large charge mass located far from the composite panel turns out to be more damaging than a small mass located nearby due to a broader pressure-time profile.Finally,the proposed model demonstrates a significant reduction in computation time,being approximately 30 times faster than its numerical counterpart,LS-DYNA/USA,making it a valuable tool for the preliminary design stages.