Implementation and verification of k-kl turbulence model

Date

2021-09-08

Author

Dikbaş, Erdem
Baran, Özgür Uğraş

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

204
views

0
downloads

In this study, we present the first results of a new turbulence model implementation in our compressible finite volume CFD solver. The k − kL turbulence model is based on the ideas of Rotta’s two-equation model. Various research groups progressively develop the model, and it is maturing rapidly. According to the results presented by others, the k − kL turbulence model provides superior results compared to other two-equation turbulence models. The improved solutions are observed especially in flows with high adverse pressure gradients, the blunt body wakes and jet interactions. We have implemented the k − kL model in our solver and we are testing it rigorously. This paper presents our results on standard turbulence test cases, which are subsonic flat plate and subsonic wall-mounted bump. The results compare well with the reference study that are previously presented and published by model developers. The k − kL model prevents excessive production of turbulence and dissipation; hence it preserves vortices significantly better than the other RANS models. Therefore, the implemented model is also tested with a transonic fin trailing vortex case and considerably better results are achieved compared to the SST turbulence model.

URI

http://aiac.ae.metu.edu.tr/paper.php?No=AIAC-2021-129
https://hdl.handle.net/11511/96499

Conference Name

11th Ankara International Aerospace Conference

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

IMPLEMENTATION, VERIFICATION AND ASSESSMENT OF VORTEX CAPTURING CAPABILITIES OF k-kL TURBULENCE MODEL Baran, Özgür Uğraş (2022-04-01) This study presents the first results of a new turbulence model implementation in our compressible finite volume CFD solver. The k - kL turbulence model is one of the newest two-equation models, and it is based on the ideas of Rotta’s two-equation model. Various research groups progressively develop the model, and it is maturing rapidly. Reports suggest that the k - kL turbulence model provides superior results compared to the other two-equation turbulence models in specific problems. The improved solutions...
Implementation of turbulence models on 2d hybrid grids using an explicit/implicit multigrid algorithm Yılmaz, Ali Emre; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2011) In this thesis study, implementation, numerical stability and convergence rate issues of turbulence modeling are explored. For this purpose, a one equation turbulence model, Spalart-Allmaras, and a two-equation turbulence model, SST k-w, are adapted to an explicit, cell centered, finite volume method based, structured / hybrid multi grid flow solver, SENSE2D, developed at TUBITAK-SAGE. Governing equations for both the flow and the turbulence are solved in a loosely coupled manner, however, each set of equat...
Application of spring analogy mesh deformation technique in airfoil design optimization Yang, Yosheph; Özgen, Serkan; Department of Aerospace Engineering (2015) In this thesis, an airfoil design optimization with Computational Fluid Dynamics (CFD) analysis combined with mesh deformation method is elaborated in detail. The mesh deformation technique is conducted based on spring analogy method. Several improvements and modifications are addressed during the implementation of this method. These enhancements are made so that good quality of the mesh can still be maintained and robustness of the solution can be achieved. The capability of mesh deformation is verified by...
Experimental Characterization of Micro Vortex Generators in Low Speed Flows Akpolat, Tuğrul; Abdulrahim, Anas; Hassanein, Abdelrahman; Uzol, Oğuz; Perçin, Mustafa (2021-09-08) In this study, we present the experimental results of the characterization of micro-ramp type Micro Vortex Generators (MVGs) in low-speed flows. The undisturbed boundary layer profile was measured by means of Hot-Wire Anemometry. Two MVGs with the same design but different height-to-boundary layer thickness ratios are used in this study. Two-dimensional twocomponent particle image velocimetry measurements are conducted in the wake of the MVGs. The results reveal the lift-off of the wake away from the wall f...
Comparison of Randomized Solutions for Constrained Vehicle Routing Problem Demirci, Ibrahim Ethem; Ozdemir, Saziye Ece; Yayla, Oğuz (2020-06-01) © 2020 IEEE.In this short paper, we study capacity constrained vehicle routing problem (CVRP) and its solution by randomized Monte Carlo methods. For solving CVRP we use some pseudorandom number generators commonly used in practice. We use linear, multiple-recursive, inversive and explicit inversive congruential generators and obtain random numbers from each to provide a route for CVRP. Then we compare the performance of pseudorandom number generators with respect to the total time the random route takes. W...

Citation Formats

E. Dikbaş and Ö. U. Baran, “Implementation and verification of k-kl turbulence model,” presented at the 11th Ankara International Aerospace Conference, Ankara, Türkiye, 2021, Accessed: 00, 2022. [Online]. Available: http://aiac.ae.metu.edu.tr/paper.php?No=AIAC-2021-129.