Assessment of Reynolds-averaged Navier–Stokes method for modeling the startup regime of a Darrieus rotor

Determination of high-speed crafts’ hydrodynamic coefficients will help to analyze the dynamics of these kinds of vessels and the factors affecting their dynamic stabilities. Also, it can be useful and effective in controlling the vessel instabilities. The main purpose of this study is to determine the coefficients of longitudinal motions of a planing catamaran with and without a hydrofoil using Reynolds-averaged Navier–Stokes method to evaluate the foil effects on them. Determination of hydrodynamic coefficients by experimental approach is costly and requires meticulous laboratory equipment; therefore, utilizing the numerical methods and developing a virtual laboratory seem highly efficient. In this study, the numerical results for hydrodynamic coefficients of a high-speed craft are verified against Troesch’s experimental results. In the following, after determination of hydrodynamic coefficients of a planing catamaran with and without foil, the foil effects on its hydrodynamic coefficients are evaluated. The results indicate that most of the coefficients are frequency-independent especially at high frequencies.

An adjoint method for the incompressible Reynolds averaged Navier Stokes using artificial compressibility

2000 IEEE Aerospace Conference. Proceedings (Cat. No.00TH8484) ◽

10.1109/aero.2000.878215 ◽

2002 ◽

Author(s):

L. Martinelli ◽

G. Cowles

Keyword(s):

Adjoint Method ◽

Navier Stokes ◽

Artificial Compressibility ◽

Reynolds Averaged Navier Stokes

Reynolds-Averaged Navier-Stokes Solutions and Noise Predictions for Three-Stream Jets

54th AIAA Aerospace Sciences Meeting ◽

10.2514/6.2016-1882 ◽

2016 ◽

Cited By ~ 4

Author(s):

Stewart J. Leib ◽

Nicholas J. Georgiadis ◽

Dennis A. Yoder

Keyword(s):

Navier Stokes ◽

Reynolds Averaged Navier Stokes

Identification of severe wind conditions using a Reynolds Averaged Navier-Stokes solver

Journal of Physics Conference Series ◽

10.1088/1742-6596/75/1/012053 ◽

2007 ◽

Vol 75 ◽

pp. 012053 ◽

Cited By ~ 9

Author(s):

N N Sørensen ◽

A Bechmann ◽

J Johansen ◽

L Myllerup ◽

P Botha ◽

...

Keyword(s):

Navier Stokes ◽

Reynolds Averaged Navier Stokes

Simulation of flow pulsations in a twin rectangular sub-channel geometry using unsteady Reynolds Averaged Navier–Stokes modelling

Nuclear Engineering and Design ◽

10.1016/j.nucengdes.2009.09.013 ◽

2009 ◽

Vol 239 (12) ◽

pp. 2964-2980 ◽

Cited By ~ 11

Author(s):

D. Home ◽

G. Arvanitis ◽

M.F. Lightstone ◽

M.S. Hamed

Keyword(s):

Navier Stokes ◽

Channel Geometry ◽

Flow Pulsations ◽

Reynolds Averaged Navier Stokes

Linear Stability-Based Smooth Reynolds-Averaged Navier–Stokes Transition Model for Aerodynamic Flows

AIAA Journal ◽

10.2514/1.j060481 ◽

2021 ◽

pp. 1-14

Author(s):

Gustavo Luiz Olichevis Halila ◽

Anil Yildirim ◽

Charles A. Mader ◽

Krzysztof J. Fidkowski ◽

Joaquim R. R. A. Martins

Keyword(s):

Linear Stability ◽

Navier Stokes ◽

Transition Model ◽

Aerodynamic Flows ◽

Reynolds Averaged Navier Stokes

Hybrid Large Eddy Simulation/Reynolds-Averaged Navier–Stokes Analysis of a Premixed Ethylene-Fueled Dual-Mode Scramjet Combustor

AIAA Journal ◽

10.2514/1.j059343 ◽

2021 ◽

pp. 1-17

Author(s):

Tanner B. Nielsen ◽

Jack R. Edwards ◽

Harsha K. Chelliah ◽

Damien Lieber ◽

Clayton Geipel ◽

...

Keyword(s):

Large Eddy Simulation ◽

Navier Stokes ◽

Dual Mode ◽

Eddy Simulation ◽

Scramjet Combustor ◽

Large Eddy ◽

Reynolds Averaged Navier Stokes

Output-Based Adaptive Reynolds-Averaged Navier–Stokes Higher-Order Finite Element Solutions on a Multielement Airfoil

AIAA Journal ◽

10.2514/1.j059968 ◽

2021 ◽

pp. 1-14

Author(s):

Carmen-Ioana Ursachi ◽

Marshall C. Galbraith ◽

Steven R. Allmaras ◽

David L. Darmofal

Keyword(s):

Finite Element ◽

Higher Order ◽

Navier Stokes ◽

Reynolds Averaged Navier Stokes

Large-Eddy and Unsteady Reynolds-Averaged Navier-Stokes Simulations of an Axial Flow Pump for Cardiac Support

Volume 2B: Turbomachinery ◽

10.1115/gt2017-65250 ◽

2017 ◽

Cited By ~ 1

Author(s):

Benjamin Torner ◽

Sebastian Hallier ◽

Matthias Witte ◽

Frank-Hendrik Wurm

Keyword(s):

Flow Field ◽

Axial Flow ◽

Pressure Head ◽

Damage Parameter ◽

Ventricular Assist Devices ◽

Navier Stokes ◽

Mean Velocity ◽

Blood Damage ◽

Large Eddy ◽

Reynolds Averaged Navier Stokes

The use of implantable pumps for cardiac support (Ventricular Assist Devices) has proven to be a promising option for the treatment of advanced heart failure. Avoiding blood damage and achieving high efficiencies represent two main challenges in the optimization process. To improve VADs, it is important to understand the turbulent flow field in depth in order to minimize losses and blood damage. The application of the Large-eddy simulation (LES) is an appropriate approach to simulate the flow field because turbulent structures and flow patterns, which are connected to losses and blood damage, are directly resolved. The focus of this paper is the comparison between an LES and an Unsteady Reynolds-Averaged Navier-Stokes simulation (URANS) because the latter one is the most frequently used approach for simulating the flow in VADs. Integral quantities like pressure head and efficiency are in a good agreement between both methods. Additionally, the mean velocity fields show similar tendencies. However, LES and URANS show different results for the turbulent kinetic energy. Deviations of several tens of percent can be also observed for a blood damage parameter, which depend on velocity gradients. Possible reasons for the deviations will be investigated in future works.