The stress concentration could be relieved by structure optimization with rounding on reinforced concrete bifurcation acute-angle-region.In order to study the influence of this measure on hydraulic characteristic, Realizablek-εmodel was adopted.Hydraulic characteristics were studied with practical construction based on CFD,including flow characteristics and head loss.Furthermore,the unevenness of fluid pressure value was compared quantitatively with different typical sections for the first time.The degree of unevenness to typical each section was defined by measurement criteria.The results indicated that the pressure value of pipe wall is uneven especially around acute-angle-region. It has a slight effect on head loss of bifurcation when the value of the acute angle rounding radius increasing.The flow pattern in bifurcation could be improved when the value of rounding radius about 0.5 times less than common tangent sphere radius under normal working condition.With the increase of the value of rounding radius the flow pattern could be deteriorated,and the unevenness of pressure value around acute-angle-region obviously would be increased.
