RANS-LES hybrid approaches have become increasingly popular. One way to construct a hybrid approach is to apply separate flow solvers to components of a complex system and to exchange information at the interfaces of the domains. For the LES flow solver, boundary conditions then have to be defined on the basis of the Reynolds-averaged flow statistics delivered by a RANS flow solver. This is a c...

Flatback airfoils are with a blunt trailing edge. They currently commonly used in the inboard part of large wind turbine blades, as they offer number aerodynamic, structural, and aeroelastic benefits. However, flow past them at high angles attack (AoA) has received relatively little attention until now. This is important because usually operate AoA Wind Turbine blades. The present investigation...

The effects of atmospheric icing can be anticipated by Computational Fluid Dynamics (CFD). Past studies show that the convective heat transfer influences ice accretion and is itself a function surface roughness. Uncertainty quantification (UQ) could help quantify impact roughness parameters on reliability prediction. This paper aims to uncertainties identify key correction contributing most in ...

This study involved a Reynolds-averaged Navier-Stokes- (RANS-) based computational fluid dynamics (CFD) analysis of the 37-pin wire-wrapped fuel bundle PNC Plant test loop (PLANDTL) facility. Previously, mainly hydrodynamic phenomena were analyzed, but present additionally included heat transfer through conjugate transfer. The main purpose was to benchmark experimental data PLANDTL investigate ...

Accurate prediction of film cooling flow is a necessity in the design high-pressure turbine components given temperature hot gas exceeds melting point component material; temperatures that are necessary to achieve high thermal efficiency. Nowadays, Computational Fluid Dynamics (CFD) methods becoming increasingly popular predict flows. When compared large eddy simulation (LES) and direct numeric...

We develop a qualitative geometric approach to swimming at low Reynolds number which avoids solving differential equations and uses instead landscape figures of two notions of curvatures: The swimming curvature and the curvature derived from dissipation. This approach gives complete information for swimmers that swim on a line without rotations and gives the main qualitative features for genera...

In this study, a composite system made of multiple porous block structure used for flow and heat transfer control will be analyzed. The primary objective of this study is to analyze the changes in the flow pattern and heat transfer characteristics due to the existence of the multiple porous block structure. A general flow model that accounts for the effects of the impermeable boundary and inert...

We analyse weak and strong controllability notions for the locomotion of the 3-link Purcell’s swimmer, the simplest possible swimmer at low Reynolds number from a geometric framework. After revisiting a purely kinematic form of the equations, we apply an extension of Chow’s theorem to analyze controllability in the strong and weak sense. Further, the connection form for the symmetric version of...