Specification of wall boundary conditions and transverse velocity profile conditions in finite element modeling

Present work mainly focuses on the influence of wall boundary conditions and imposition of transverse velocity boundary conditions on the flow field of a bluff body. Uniform velocity over the nodestring is specified in slip condition mode. Three types of transverse velocity profile are adopted for the no slip situation; top hat is same as slip case except for no velocities at wall; parabola for the simple and typical approximation of transverse velocity shape in open channel flow; beta distribution for the general expansion. Assignment of top hat and parabola velocity profiles yields maximum velocity nearby the cylinder while uniform one has maximum magnitude at side walls. Maximum velocity of parabola input is about 44% higher than that of uniform assignment.