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首页> 外文会议>ASME(American Society of Mechanical Engineers)/JSME Pressure Vessels and Piping Conference: Computational Technologies for Fluid/Thermal/Structural/Chemical Systems with Industrial Applications v.2; 20040725-20040729; San Diego,CA; US >COMPUTATIONAL SIMULATION OF FLOW IN A DISSECTING AORTIC ANEURYSM RECONSTRUCTED FROM CT IMAGES
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COMPUTATIONAL SIMULATION OF FLOW IN A DISSECTING AORTIC ANEURYSM RECONSTRUCTED FROM CT IMAGES

机译：CT图像重建主动脉瘤的血流计算模拟

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We have simulated blood flow through the shape of dissecting aortic aneurysm reconstructed from CT images. An aortic dissection is a tear in the inner lining of the aorta, creating a space between the inner and outer layers called a false lumen. The pipe where the usual bloodstream flows is called a true lumen. The thrombus or the bloodstream exists at the exit of the false lumen. Currently, there are not flow simulations of dissecting aortic aneurysms that use the individual patient's shape. Under these circumstances, we thought that it would be useful to examine the stress that joins the vessel walls by numerical simulation, in order to changes after the onset of the disease. To obtain accurate simulation results, we examined a method for obtaining a highly accurate dissected aortic aneurysm shape. We assumed the maximum Reynolds number for systolic pressure. The constant flow was given by the entrance boundary. The calculation scheme is a finite volume method. The Reynolds number was about 9000. The result showed that flow in the false lumen was rotational flow and lower than that in the true lumen. Flow in the true lumen was not rotational flow. In general, MRI imagery has shown that flow in the aortic arch is rotational. The magnitude of the velocity in the true lumen was about 11 times the velocity in the false lumen. Therefore, high wall shear stress was showed three areas at wall in true lumen. Both wall shear stress and pressure values were high in the re-entry portion.
机译：我们通过从CT图像重建的解剖主动脉瘤的形状模拟了血流。主动脉夹层是主动脉内壁的撕裂，在内外层之间形成了一个称为假管腔的空间。正常血液流经的管道称为真管腔。血栓或血流存在于假管腔的出口。当前，还没有使用个体患者形状的解剖主动脉瘤的血流模拟。在这种情况下，我们认为通过数值模拟检查连接血管壁的应力以在疾病发作后发生变化是很有用的。为了获得准确的模拟结果，我们研究了一种用于获得高度精确的主动脉瘤解剖形状的方法。我们假设收缩压为最大雷诺数。恒定流量由入口边界给出。计算方案是有限体积法。雷诺数约为9000。结果表明，假管腔中的流动是旋转流动，低于真实管腔中的流动。真实管腔中的流动不是旋转流动。通常，MRI图像显示主动脉弓内的血流是旋转的。真实内腔中的速度大小约为假内腔中速度的11倍。因此，在真正的管腔中，在壁的三个区域显示出高壁剪切应力。再入部分的壁切应力和压力值均很高。

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