Arterial branches are found to be a major site for formation of arterial plaque. In this study, we investigate the role of the bifurcation angle on the flow into a symmetric bifurcation. Specially, how the changes in the bifurcation angle influences the distribution of axial wall shear in the bifurcation model. The flow in a range of branch opening half-angle of $π/25⩽θ⩽π/4$ are numerically simulated. The flow in the above models is calculated for the inlet flow Reynolds numbers of 250, 500, 1000, and 2000. It is found that at higher values of the opening angle of the bifurcation, the possibility and severity of flow separation at the appropriate wall location increases.

1.
Ku
,
D. N.
,
1997
, “
Blood flow in arteries
,”
Annu. Rev. Fluid Mech.
,
29
, pp.
399
434
.
2.
Giddens
,
D. P.
,
Zarins
,
C. K.
, and
Glagov
,
S.
,
1993
, “
The role of fluid mechanics in the localization and detection of atherosclerosis
,”
ASME J. Biomech. Eng.
,
115
, pp.
588
594
.
3.
Lou
,
Z.
, and
Yang
,
W.
,
1992
, “
Biofluid dynamics at arterial bifurcation
,”
Crit. Rev. Biomed. Eng.
,
19
,
455
493
.
4.
Friedman
,
M. H.
, and
Zhaohua
,
D.
,
1998
, “
Relation between the structural asymmetry of coronary branch vessels and the angle at their origin
,”
J. Biomech.
,
31
, pp.
273
278
.
5.
,
M.
and
Himeno
,
R.
,
2002
, “
Time-Accurate, Parallel, Multi-Zone, Multi-Block Solver to Study the Human Cardio-Vascular System
,”
Biorheology
,
39
, pp.
379
384
.