Boundary Layer Transition Prediction over Wind Turbine Blade Profile through Detached Eddy Simulation

Date

2019-05-14

Author

Yalçın, Özgür
Özyörük, Yusuf

Metadata

Show full item record

Item Usage Stats

147
views

0
downloads

This proposed study aims at simulating slightly separated flow over the NREL S826 wind turbine blade profile with delayed detached-eddy simulation (DDES) strategy. The Reynolds number is relatively low and the angles of attack are around the stall region so that flow is not massively detached. This type of flow where boundary layer transition and laminar separation take place is difficult to simulate by DDES. To handle the problem and increase the capability of DDES, three developments that have appeared recently in literature are combined. The first one is a modification to SpalartAllmaras (S-A) one equation, which allows setting initial eddy viscosity value as zero for apparent transition behavior. Secondly, the shear-layer-adapted subgrid length scale instead of the classical one, maximum edge length of cells, is used in the resolved mode of DDES. By this enhancement, emergence of turbulent content could be accelerated inside boundary layers in presence of instability. As a third one Bas-Cakmakcioglu (BC) algebraic transition model is adapted to the modified S-A turbulence equation. The simulations are being performed by an inhouse solver, METUDES, and some preliminary results are demonstrated. In the final manuscript, the results will be compared with those of available data from a DDES study that uses standard subgrid length scale, and from a RANS study that employs Langtry-Menter transition prediction model.

URI

https://hdl.handle.net/11511/79102
http://www.parcfd.org/2019/program/serv.php?No=1069

Conference Name

31st International Conference on Parallel Computational Fluid Dynamics, 2019

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Delayed detached-eddy simulation around NREL S826 blade section for transition prediction Yalçın, Özgür; Özyörük, Yusuf (2018-09-20) This proposed study aims at simulating slightly separated flow over the NREL S826 wind turbine blade section profile with delayed detached-eddy simulation (DDES) strategy. The Reynolds number is relatively low and the angles of attack are around the stall region so that flow is not massively detached. This kind of flow where laminar-turbulent transition and laminar separation take place is difficult to simulate by DDES. To handle the problem and increase the capability of DDES, three developments that appea...
FLUID-STRUCTURE INTERACTION ANALYSIS OF A FOUR-BAR FLAPPING WING MECHANISM Beker, Can; Turgut, Ali Emre; Arıkan, Kutluk Bilge; Kurtuluş, Dilek Funda (2019-07-11) In this paper, it is introduced to find net aerodynamic lift capacity of proposed flapping-wing micro air vehicle (FWMAV) by performing dynamical calculation and FSI (Fluid Structure Interaction) analysis of a flapping wing test system. In the flapping system, a single degree of freedom type four-bar mechanism which was used as a piezo-driven flapping wing mechanism in previous literature studies is implemented to create beating motion of the wings. For the wing structure, Calliphora Erythocephala’s wing is...
Discrete Adjoint-Based Aerodynamic Shape Optimization Framework for Natural Laminar Flows Kaya, Halil; Tuncer, İsmail Hakkı (2022-01-01) Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.An adjoint-based aerodynamic shape optimization framework for natural laminar flows is developed. The laminar to turbulent-transition onset is predicted by the correlation-based Bas–Cakmakcioglu transition model that is coupled with the Spalart–Allmaras turbulence model. A discrete adjoint implementation is subsequently developed. Automatic differentiation is utilized to construct the partial derivatives in the discre...
Tsunami-induced scour around monopile foundations Larsen, Bjarke Eltard; Fuhrman, David R.; Baykal, Cüneyt; Sumer, B. Mutlu (2017-11-01) A fully-coupled (hydrodynamic and morphologic) numerical model is presented, and utilized for the simulation of tsunami-induced scour around a monopile structure, representative of those commonly utilized as offshore wind turbine foundations at moderate depths i.e. for depths less than 30 m. The model is based on solutions to Reynolds-averaged Navier-Stokes equations, coupled with two-equation k a, turbulence closure, with additional bed and suspended load descriptions forming the basis for sea bed morpholo...
Multistage launch vehicle design with thrust profile and trajectory optimization / Civek Coşkun, Ezgi; Özgören, Mustafa Kemal; Department of Mechanical Engineering (2014) In the frame of this thesis, a Matlab® based design tool utilizing a general purpose optimal control solver GPOPS-II® was developed for the optimization of ascent trajectories of multistage launch vehicles. This tool can be utilized both for preliminary mission design of an existing launch vehicle and conceptual design of a new launch vehicle. In the preliminary mission design of an existing launch vehicle, maximizing payload mass is a very common performance measure. Therefore, a trajectory optimization co...

Citation Formats

Ö. Yalçın and Y. Özyörük, “Boundary Layer Transition Prediction over Wind Turbine Blade Profile through Detached Eddy Simulation,” presented at the 31st International Conference on Parallel Computational Fluid Dynamics, 2019, Antalya, TURKEY, 2019, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/79102.