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首页> 外文期刊>Biomedical Engineering: Applications, Basis and Communications >A NUMERICAL STUDY ON THE HEMODYNAMIC AND SHEAR STRESS OF DOUBLE ANEURYSM THROUGH S-SHAPED VESSEL
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A NUMERICAL STUDY ON THE HEMODYNAMIC AND SHEAR STRESS OF DOUBLE ANEURYSM THROUGH S-SHAPED VESSEL

机译:S形血管对双动脉的热力学和剪切应力的数值研究

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摘要

Abdominal aortic aneurysm (AAA) is a degenerative disease defined as the abnormal ballooning of the abdominal aorta (AA) wall which is usually caused by atherosclerosis. The aneurysm grows larger and eventually ruptures if it is not diagnosed and treated. Aneurysms occur mostly in the aorta, the main artery of the chest and abdomen. The aorta carries blood flow from the heart to all parts of the body, including the vital organs, the legs, and feet. The objective of the present study is to investigate the combined effects of aneurysm and curvature on flow characteristics in S-shaped bends with sweep angle of 90° at Reynolds number of 900. The fluid mechanics of blood flow in a curved artery with abnormal aortic is studied through a mathematical analysis and employing Cosmos flow simulation. Blood is modeled as an incompressible non-Newtonian fluid and the flow is assumed to be steady and laminar. Hemodynamic characteristics are analyzed. Grid independence is tested on three successively refined meshes. It is observed that the abrupt expansion induced by AAA results in an immensely disturbed regime. The results may have implications not only for understanding the mechanical behavior of the blood flow inside an aneurysm artery but also for investigating the mechanical behavior of the blood flow in different arterial diseases, such as atherosclerosis.
机译:腹主动脉瘤(AAA)是一种退行性疾病,定义为通常由动脉粥样硬化引起的腹主动脉(AA)壁异常膨胀。如果不进行诊断和治疗,动脉瘤会变大并最终破裂。动脉瘤多发于主动脉,即胸部和腹部的主要动脉。主动脉将血液从心脏流到身体的各个部分,包括重要器官,腿和脚。本研究的目的是研究动脉瘤和曲率对S型弯曲的流动特性(雷诺数为900时90°后掠角)的综合影响。主动脉异常的弯曲动脉中的血流的流体力学是通过数学分析并使用Cosmos流模拟进行了研究。血液被建模为不可压缩的非牛顿流体,并且假定流动稳定且呈层流状态。分析血流动力学特征。网格独立性在三个连续精炼的网格上进行了测试。可以观察到,由AAA引起的突然膨胀会导致极大的干扰。该结果可能不仅对理解动脉瘤内部的血流的机械行为有影响,而且对于调查在不同动脉疾病(例如动脉粥样硬化)中的血流的机械行为也具有意义。

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