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- 저자 : Minzu Zhang (검색결과 2 건)
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Design of stepwise foam claddings subjected to air-blast based on Voronoi model
Minzu Liang,Fangyun Lu,Guodong Zhang,Xiangyu Li 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.1
Design of stepwise foam claddings subjected to air-blast is performed based on random Voronoialgorithm. FE models are constructed using the random Voronoialgorithm, and numerical analysis is carried out to simulate deformation mode and energy absorption of the cladding by the ABAQUS/Explicit software. The FE model is validated by test result, and good agreement is achieved. The deformation patterns are presented to give an insight into the influences of distribution on deformation mechanisms. The energy absorbed by the stepwise foam cladding is examined, and the parameter effects, including layer number, gradient, and blast loading, are discussed. Results indicate that the energy absorption capacity increases with the number of layer, gradient degree, and blast pressure increasing.
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Modeling of Left Ventricular Motion and Hemodynamic Analysis Based on CT Tomography
Zhixiong Li,Liang Qi,Wei Han,Minzu Zhang,Tianci Duan,Yan Qiang 한국유체기계학회 2024 International journal of fluid machinery and syste Vol.17 No.1
Based on Computed Tomography (CT) tomography images of the human heart, a 3D reconstruction and wall optimization of the heart was performed by using Mimics to model the motion of the left ventricular overflow wall. The non-Newtonian blood flow in the left ventricle was numerically simulated using the dynamic mesh technique based on User Defined Functions (UDF) programming of the left ventricular wall motion. When the left ventricle is diastolic, the internal pressure gradually increases, the blood flow structure approximates the physiological blood flow pattern, the rate at the mitral orifice first increases and then decreases, and a local high stress zone appears. When the left ventricle is systolic, the pressure gradient is significant, the internal pressure decreases and the rate at the aortic valve orifice shows a pattern of increasing and then decreasing. The dynamic simulation of left ventricular blood flow provides a feasible technical solution for the fluid dynamics analysis of cardiac physiological and pathological processes
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