北京生物醫(yī)學工程

支架治療動脈瘤流固耦合數(shù)值模擬的周期重復性研究

Periodic repeatability of FSI numerical simulation for stented aneurysm

作者：陳雪喬愛科

單位：北京工業(yè)大學生命科學與生物工程學院(北京100124)

分類號：

出版年·卷·期（頁碼）：2012·31·5（450-456）

摘要：

目的探討瘤用支架血流動力學流固耦合數(shù)值模擬過程中不同計算周期的相對誤差大小,以給出獲得收斂結果的最小周期推薦值。方法利用有限元分析軟件ANSYS對植入不同截面形狀支架治療梭形動脈瘤模型進行流固耦合數(shù)值模擬。每個模型進行3個周期的迭代計算，計算出各模型的動脈瘤腔內(nèi)血液流速、壓力、壁面切應力等血流動力學參數(shù)。最后比較相鄰周期的相對誤差絕對值，根據(jù)數(shù)據(jù)后處理結果得到計算的最佳周期數(shù)。結果各模型的動脈瘤腔內(nèi)血流動力學參數(shù)計算1周期與計算2周期的相對誤差絕對值遠高于5%，重復計算3個周期與計算2個周期的相對誤差絕對值均小于5%。結論有限元分析軟件ANSYS進行支架非定常血流動力學流固耦合數(shù)值模擬計算時，計算2個周期可達一定精確度，避免不必要的時間消耗，為支架治療梭形動脈瘤的流固耦合數(shù)值模擬研究提供參考依據(jù)。

Objective This study focused on the relative errors in the fluid-structure interaction (FSI) of numerical simulation for stented aneurysm between different computing cycles, and intended to recommend the minimum periods for obtaining the convergent iteration results. Methods The finite element analysis software ANSYS was adopted to simulate the FSI of fusiform aneurysm treated with different cross-section shape stents. Three cardiac cycles of iteration were performed for each model. Hemodynamic parameters, such as blood flow, pressure, wall shear stress and so on, were calculated and analyzed. The optimal computing cycle was obtained from the comparison of the relative errors between different cycles. Results The relative errors of all the parameters of the first cycle and the second cycle are far larger than 5%, and the relative errors of the second cycle and the third cycle are less than 5%. Conclusions The minimum calculation period recommended was two cycles in numerical simulation of FSI for stented aneurysm. The results provided some theoretical guidance to the numerical simulation of FSI in the treatment of fusiform aneurysms with stents.

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