Numerical blood flow simulations in narrowed coronary venous bypass graft.

[Abstract] Objective The purpose of this paper was to non唱invasively assess hemodynamic parameters such as mass flow,wall shear stress,and wall pressure with computational fluid dynamics (CFD) in venous bypass graft using patient唱specific data from computed tomography (CT) angiography.Methods Narrowed venous bypass graft creating a constriction can significantly alters the local blood flow dynamics.Flows which were initially laminar can locally transition to a disturbed or quasi唱turbulent state,depending on the geometry, forcing conditions and fluid properties.Results In this paper,a three唱dimensional thick唱wall model with rigid wall is introduced to simulate blood flow in narrowed venous bypass graft for understanding the detailed flow physics of transition to turbulence downstream of the graft curvature.Conclusion In the present paper we have developed and implemented new methods that will enable the creation of postoperative vascular models using simulation based medical planning sys唱 tem.