Evaluation of Curvature Correction Methods for Tip Vortex Prediction in SST kOmega Turbulence Model Framework
Journal article, 2019

This paper presents and studies effects of curvature correction (CC) methods to improve two equation RANS simulations of tip vortex flows, exemplified using the SST kOmega turbulence model. Performance of the CC models is first evaluated in the classical Rankine vortex flow field, and then extended into the study of tip vortex flows over an elliptical foil. The results have been compared with experimental measurements in terms of the vortex strength and velocity field, and the importance of the turbulence closure in tip vortex simulations is highlighted.

Contribution of the CC models in different terms of the turbulent kinetic energy and specific dissipation transport equations are described, and it is discussed why a CC model may have mesh resolution dependent results. By considering the distribution of the CC function, it is shown that although some of the models can predict the location of the tip vortex core accurately, they still do not significantly improve the vortex prediction as the impact on the turbulent viscosity is wrong or not enough. It is further noted that as some of these models have been calibrated on specific vortex flows, they may not be completely applicable for other cases without recalibration. It is shown that some CC models provide accurate tip vortex predictions, primarily the ones based on the sensitization of the turbulent viscosity. Further, it is noteworthy that the successful models are active not only around the vortex, but also change the boundary layer characteristics on the foil, and the boundary layer separation lines, which consequently can provide the required momentum for the vortex core accelerated axial velocity.

Tip vortex

Curvature correction

RANS

SST kOmega

Author

Abolfazl Asnaghi

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Urban Svennberg

Rolls-Royce (Swe)

Rickard Bensow

Chalmers, Mechanics and Maritime Sciences, Marine Technology

International Journal of Heat and Fluid Flow

0142-727X (ISSN)

Vol. 75 C 135-152

RoughProp - reduced radiated noise to the oceans through surface roughness

VINNOVA, 2018-11-19 -- 2020-05-31.

Driving Forces

Sustainable development

Innovation and entrepreneurship

Areas of Advance

Transport

Energy

Subject Categories

Applied Mechanics

Fluid Mechanics and Acoustics

Marine Engineering

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1016/j.ijheatfluidflow.2018.12.002

More information

Latest update

1/9/2019 1