Generation of Computational Mesh for Haemodynamics Analysis - Computational Hemodynamics: Theory, Modelling and Applications - page 174

Fig. 6.22 Blocking strategies for bend geometry and bifurcating geometry

a 90 o -bend found in the aortic arch can be treated as a single O-grid block topol-
ogy, where the block is split into two sub-regions to allow for the bend. The second
example is a bifurcating geometry where the initial block is split into six smaller
blocks. The two outer blocks are then discarded to leave four smaller blocks that
form a T-shape. This block is then re-shaped and split further for more control in the
final mesh.

6.5.3 Stenosed Artery Step-By-Step

In this section we present a specific example of a representative straight artery ves-
sel with a moderate stenosis and provide detailed step by step guide Fig. 6.23 .

1. First, the fluid domain is enclosed by a single initial block.
2. This block is split into six sub-blocks (shown by the red markings in Fig. 6.23 )
that includes four sub-blocks at the stenosis site where the cross-sectional area
experiences abrupt changes.
3. Each edge from the six sub-blocks is projected to the corresponding fluid domain
surfaces and curves at the inlet and outlet. To optimize mesh quality, the block
vertices are evenly spaced to minimize the average deviation of the edges from
the surface curvature.