在生物力學應用領域中，人工心臟瓣膜誘導流場所形成的擾動，對於血液中血球的活化或是破壞扮演重要的角色。目前實驗方法，對於人工心臟瓣膜內側的流場變化，所形成的應力及渦流分布，在實際量測上受到極大的限制。因此，以數值模擬預測流場在瓣膜附近之應力分布及渦流分離問題已成為主要的研究方法。本文所採用的數值模擬程序，是以結構性任意四邊形網格建立計算域，運用任意Lagrangian-Eulerian數值方法，並結合次網格尺度(Subgrid scalar method)紊流模式來求解均時Navier-Stokes方程式。本文探討主動脈雙葉片人工心臟瓣膜與主動脈竇腔間配置關係對流場的影響，根據計算結果顯示，當瓣膜葉片與竇腔呈交錯配置時可以得到較適當的渦流分布。 Perturbation of the flow field induced by artificial heart valve playsan important part which in blood active and destroyed problem. Sincethe experiment study at artificial heart valve interior boundary isvery difficult to measure. Therefore, the numerical simulation of theshear stress distribution and vortex shedding become useful. In thispaper we solve the time mean Navier-Stokes equation include theSubgrid-Scale turbulence model with Arbitrary Lagrangian-Euleriannumerical method in structure arbitrary quadrilateral mesh system. Thesubject of this paper is to study the effect of the relative positionof artificial heart valve and symmetrical sinus. According to theresult of numerical simulation, suitable vortex flow field we get atalternating position.
