Analysis results highlight that the shear stress distribution and vortex flow regime are serious affected by the leaflet opening situation and valve geometry. Maximum shear stress takes place near the center of leaflet trailing edge and near the aortic root where jet impingement takes place. The analysis results can be used to specify the requirements of crucial criteria of prosthesis aortic valve and to optimize the prosthesis aortic design. | The 21st International Symposium on Transport Phenomena 2010, Kaohsiung City, Taiwan QUASI-STEADY FLOW DYNAMICS STUDY OF HUMAN AORTIC VALVE: AN EVALUATION WITH NUMERICAL TECHNIQUES Hsu1, Vu1, Nguyen1, Kang2 1 Department of Mold and Die Engineering and Graduate Institute of Applied Sciences National Kaohsiung University of Applied Sciences, Kaohsiung City, Taiwan 2 Department of Mechanical Engineering and Graduate Institute of Applied Sciences National Kaohsiung University of Applied Sciences, Kaohsiung City, Taiwan ABSTRACT Human aortic valve, one of the four valves in the heart, is made of thin collagen type tissue. The three valve leaflets open and close under fluid forces exerted upon them to prevent blood once it is in the aorta from returning to the heart. The dysfunctions of the aortic valve compromises cardiovascular regulation and may severely affect quality of life. To solve these diseases, we need to consider the effect of the blood flow on the wall and the valve leaflets. To simulate the hemodynamics characteristics of the blood flow, ANSYS software was utilized to analyze the three-dimensional Reynolds-averaged Navier-Stokes equation. With a quasi-steady analysis model, the author predicts values of the blood velocity and the wall shear stress both over the valve leaflets and the endothelial lining. Analysis results highlight that the shear stress distribution and vortex flow regime are serious affected by the leaflet opening situation and valve geometry. Maximum shear stress takes place near the center of leaflet trailing edge and near the aortic root where jet impingement takes place. The analysis results can be used to specify the requirements of crucial criteria of prosthesis aortic valve and to optimize the prosthesis aortic design. Keywords：aortic valve, hemodynamic characteristics, wall shear stress distributions in the regime. Computational fluid dynamics (CFD) have become popular to determine areas of high fluid .
