| Summary: | 碩士 === 華梵大學 === 機電工程研究所 === 92 === Previous study shows that transposition of the great arteries in spiral fashion is recommended because the consequent pulmonary flow patterns are more streamlined than those of the Lecompte maneuver. To clarify the functional implications of the spiral relationship of the great arteries, we propose to study flow models of pulmonary artery after ASO in two different fashions: Lecompte and spiral maneuvers.
The physiological blood flow waveforms and dimensions of the main pulmonary artery, right and left pulmonary arteries were measured from patients at the National Taiwan University Hospital. A Lecompte model and a Spiral model were constructed by ANSYS, and then transferred to StarCD to perform calculations. The flow was analyzed in pulsatile flow fashion. Each cycle was 0.792 sec which was divided into 22 periods. Each period interval was 0.036 sec. For the transient cases, the PISO method was applied.
In both Lecompte and Spiral models,we can find maximum relative pressure and minimum wall shear stress at the bifurcation of the pulmonary artery where we can also find stagnation point easily. At this stagnation point, low shear stress and pulmonary stenosis also occurs. We can deduce that pulmonary stenosis is highly correlated with wall shear stress. The secondary flow is also found in these two models.
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