Аутори:
1. Dečan Ivanović, Mašinski fakultet u Crnoj Gori, Montenegro
2. Vladan Ivanović, Mašinski fakultet u Crnoj Gori, Montenegro

Апстракт:
The equations of unsteady incompressible boundary layer, by introducing the appropriate variable transformations, momentum and energy equations and one similarity parameters set, being transformed into generalized form. These parameters are expressing the influence of the outer flow velocity and the flow history in boundary layer, on the boundary layer characteristics. The numerical integration of the generalized equation with boundary conditions has been performed in: 1) full two parametric approximation, where the first unsteady and dynamic parameters will remaine, while all others will be let to be equal to zero, 2) two-once localized parametric approximation where only first unsteady parameter remained and 3) two-once localized parametric approximation, only with first dynamic parameter, where also parameters will be let to be equal to zero. So obtained generalized solutions are used to calculate the distributions of velocity and shear stress in laminar-turbulent transition of unsteady boundary layer on circular. It's found that in diffuser region of contour, the fluid acceleration increases the friction and postpones the boundary layer separation, and vice versa the fluid deceleration reduces the shear stress and favours the separation of flow.

Кључне речи:
Aproximations of boundary layer equation,velocity and shear stress distribution

Тематска област:
Механика и конструкције

Датум пријаве сажетка:
10.03.2017.

Конференцијa:
13th International Conference on Accomplishments in Mechanical and Industrial Engineering