  In this study,we investigate the characteristics of three-dimensional
turbulent boundary layers influenced by transverse flow and pressure gradients.
Our findings reveal that even without assuming an infinite sweep, a fully
developed turbulent boundary layer over the present swept blunt body maintains
spanwise homogeneity, consistent with infinite sweep assumptions.We critically
examine the law-of-the and temperature-velocity relationships, typically
applied two-dimensional turbulent boundary layers, in three-dimensional
contexts. Results show that with transverse velocity and pressure gradient,
streamwise velocity adheres to classical velocity transformation relationships
and the predictive accuracy of classical temperaturevelocity relationships
diminishes because of pressure gradient. We show that near-wall streak
structures persist and correspond with energetic structures in the outer
region, though three-dimensional effects redistribute energy to align more with
the external flow direction. Analysis of shear Reynolds stress and mean flow
shear directions reveals in near-wall regions with low transverse flow
velocity, but significant deviations at higher transverse velocities.
Introduction of transverse pressure gradients together with the transverse
velocities alter the velocity profile and mean flow shear directions, with
shear Reynolds stress experiencing similar changes but with a lag increasing
with transverse. Consistent directional alignment in outer regions suggests a
partitioned relationship between shear Reynolds stress and mean flow shear:
nonlinear in the inner region and approximately linear in the outer region.
