title: Metric field construction for anisotropic mesh adaptation with application to blood flow simulations.
abstract: The goal of this paper is to generate an anisotropic metric field suitable for cardiovascular geometries before a fluid simulation. Starting from a curvature map, an initial surface metric field is computed. This metric is used for anisotropic surface mesh adaptation and consecutively extended inside the volume in a frontal manner. The algorithm is based on the method proposed by Alauzet but replaces the metric intersection steps by an original metric 'blending'. This allows for a graded anisotropic volume mesh with a refinement layer close to the walls. The benefits of the resulting mesh are multiple: a reduced number of degrees of freedom, a priori refinement in areas with strong gradients of velocity and automatically increased resolution in regions with high surface curvature. The primal application of this method is in the domain of cardiovascular flows. Flow fields and derived quantities (wall shear stress) through a model bypass around a stenosed artery obtained on an adapted and standard isotropic mesh are compared. In addition, the mesh generation method is tested on a more complex patient-specific geometry. Values of computed wall shear stress are shown to be close to values obtained on anisotropic Hessian-adapted mesh, demonstrating the computational efficiency of the approach in comparison with adaptation based on error indicators derived from flow field.
authors.affiliation: Institute of Mechanics, Materials and Civil Engineering (iMMC), Université catholique de Louvain (UCL), Avenue Georges Lemaître, 4, B-1348 Louvain-la-Neuve, Belgium.
authors.forename: E
authors.initials: E
authors.lastname: Sauvage
authors.forename: J F
authors.initials: JF
authors.lastname: Remacle
authors.forename: E
authors.initials: E
authors.lastname: Marchandise
mesh_terms: D000465:Algorithms; D001012:Aorta, Abdominal / Q000502:physiology; D001783:Blood Flow Velocity; D001808:Blood Vessels / Q000502:physiology*; D003198:Computer Simulation; D003331:Coronary Vessels / Q000502:physiology; D006439:Hemodynamics; D006801:Humans; D008955:Models, Cardiovascular
keywords: WSS; anisotropic mesh; blood flow; curvature-based refinement; mesh adaptation