| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 94 === A parallel computation system is applied for the numerical simulation in association with the least-squares finite element method (LSFEM) to study the flow fields and mass transfer in the abdominal aorta with two branches, which are on the same side of the artery with diameter D. The effects on flow field and mass transfer in relation to the distance (S) between two branches are investigated. From the distribution of velocity vector, streamline and concentration, it can be found when the distance between two branches is greater than one time of the diameter of the artery ( ) the interaction of flow field is small. The distribution of mass transfer of oxygen concentration is closely related to the existence of the vortex flow. The distribution of low concentration of oxygen is in the circulation zone near the wall of arteries, besides that the concentration is the same as the one in the inlet section. The area of low concentration could be the place of the intimal hyperplasia. This numerical model can be used to have a better understanding of the whole complicated flow field and mass transfer. Based on the parallel system, the computational CPU time can be improved by 100% for the complicated domain.
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