Blood Flow Simulation of Left Ventricle with Twisted Motion
Blood Flow Simulation of Left Ventricle with Twisted Motion
复制标题
扭转运动左心室的血流模拟
DOI：
10.1007/978-3-031-08760-8_29
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Seiichi Takeuchi
中科院分区：
文献类型：
--
作者：
Masashi Yamakawa;Yuto Yoshimi;Shinichi Asao;Seiichi Takeuchi
为了将血流推到主动脉，左心室重复扩张和收缩运动。为了更有效地泵送血液，已知左心室也具有扭转运动。本文研究了扭转运动对主动脉血流的影响。特别是，心血管疾病的起源和壁切应力之间的关系已被指出在主动脉区域。通过计算扭转运动对血管壁切应力的影响，进行了血流模拟。为了表达其复杂的形状和运动，采用了非结构移动网格有限体积法。在该方法中，控制体被定义为时空统一域。该方法不仅满足物理守恒律，而且满足几何守恒律。 然后利用该方法进行高精度计算。计算结果表明，由于左心室扭转运动的影响，左心室内产生的复杂旋涡结构有明显的差异。旋涡结构对进入主动脉的血流产生影响，从而产生明显的壁面切应力差异。出现差异的部位是主动脉弓，则与动脉硬化的好发部位相对应。因此，结果表明，左心室扭曲运动的模拟将是有用的，以指定心脏疾病的原因的可能性。
To push out a blood flow to an aorta, a left ventricle repeats expansion and contraction motion. For more efficient pumping of the blood, it is known that the left ventricle also has twisted motion. In this paper, the influence of the twisted motion for a blood flow to an aorta was investigated. In particular, the relationship between the origin of cardiovascular disease and wall shear stress has been pointed out in the aorta region. Estimating the difference of the wall shear stress depend on the presence or absence of the twisted motion, the blood flow simulation was conducted. To express its complicated shape and the motion, the unstructured moving grid finite volume method was adopted. In this method, the control volume is defined for a space time unified domain. Not only a physical conservation law but also a geometric conservation law is satisfied in this approach. Then high accurate computation is conducted under the method. From the computation results, a remarkable difference of complicated vortex structures generated in the left ventricle was found as the influence of the left ventricular twisted motion. The vortex structures affected the blood flow leading into the aorta with the result that they generated a clear difference of the wall shear stress. The region where the difference occurred is aortic arch, then it corresponded with a favorite site of arteriosclerosis. Thus, the result showed the possibility that the simulation with the left ventricular twisted motion would be useful to specify causes of heart diseases.
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