Boundary Layer (FSI-9MEV)

Academic year 2021/2022

Supervisor:	prof. Ing. Karol Fiľakovský, CSc.
Supervising institute:	LÚ	all courses guaranted by this institute
Teaching language:	Czech or English
Aims of the course unit:
The aim of the course is to repeat and expand basic knowledge on boundary layers of the basic study of Aerodynamics. Solving of tasks of aerodynamic of aircraft using knowledge of boundary layers and using packages of CFD codes.
Learning outcomes and competences:
Coursants will gain expanded knowledge on the boundary layers which are the base for understanding of fluid flow in internal and external aerodynamics.
Prerequisites:
Basic knowledge of conservation laws and boundary layers gained at primary course on Aerodynamics.
Course contents:
Introduction, definition of Boundary Layer (BL), influence of the BL on flow inside bodies (internal aerodynamics) and on flow around bodies (external aerodynamics). Boundary and initial conditions at solving PDE of fluid flows, history of opinions to the BL. Laminar, transition and turbulent boundary layers (LBL, TrBL, TBL). Instability of the LBL, transition of the LBL to the TBL through TrBL. Boundary layer at a flat plate, boundary layers with pressure gradients. Separation of the LBL and TBL, basic differences. Influence of Reynolds number on the separation of the BL. Influence of turbulence of incoming flow and surface roughness. The BL with influence of compressibility, basic differences when comparing incompressible BL.
Teaching methods and criteria:
The course is taught through lectures explaining the basic principles and theory of the discipline.
Assesment methods and criteria linked to learning outcomes:
Student has give the proof of deeper knowledge on boundary layers at oral examination.
Controlled participation in lessons:
Self study of chosen chapters with consultations.
Type of course unit:
Lecture	10 × 2 hrs.	optionally
Course curriculum:
Lecture	1. Introduction, history of opinions on flows near the surface of bodies. 2. Navier-Stokes Equations (NSE) describing flow with viscosity influence. 3. Simplification of NSE for high Reynolds numbers. 4. Solution of Prandtl's equation for flat plate and laminar Boundary layer. 5. Instability of laminar boundary layer. 6. Laminar, Transition and Turbulent Boundary Layer (LBL, TrBL, TBL) at flat plate. 7. Origin of turbulence, turbulence description, turbulence models. 8. Turbulence calculation in BL. 9. BL with pressure gradient, integral characteristics of BL. 10.LBL and TBL at unfavorable pressure gradient, separation of BL. 11.Turbulence of incoming flow and surface roughness influencing BL. 12.Compressibility effects on BL, thermal BL, shock waves and BL. 13.Models of turbulence in packs of CFD codes.

Literature - fundamental:
1. A.D. Young: Boundary Layers. BSP Professional Books
2. Frank. M. White: Viscous Fluid Flow. McGraw-Hill
Literature - recommended:
1. Doc. Ing. Ján Citavý: Mezní vrstvy. Soukromé vydání