IMPLEMENTATION, VERIFICATION AND ASSESSMENT OF VORTEX CAPTURING CAPABILITIES OF k-kL TURBULENCE MODEL

Download

index.pdf

Date

2022-04-01

Author

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

175
views

88
downloads

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 are observed mainly for the flows with high adverse pressure gradients, the blunt-body wakes and jet interactions. We have implemented the k - kL model (with the standard designation of k-kL-MEAH2015) in our solver, and we are testing it rigorously. This paper presents our results on standard turbulence test cases: subsonic flat plate and subsonic wall-mounted bump. The results compare well with the reference study previously presented and published by model developers. The design of the k - kL model prevents excessive production of turbulence and dissipation; hence it preserves vortices significantly better than the other two-equation models. The implemented model is also tested with a transonic fin trailing vortex case to support this statement. Results show that the k-kL model yields considerably better results than the SST turbulence model in cases including vortices.

URI

https://hdl.handle.net/11511/98081

Journal

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY

DOI

https://doi.org/10.47480/isibted.1107477

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Implementation and verification of k-kl turbulence model Dikbaş, Erdem; Baran, Özgür Uğraş (2021-09-08) 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...
Formulation of a beam finite element for micro beams Pehlivanoğlu, Yücel; Kadıoğlu, Fevzi Suat; Department of Mechanical Engineering (2018) This study presents an Euler Bernoulli type micro-beam finite element for analyzing the size-dependent static and dynamic behavior of micro beams. The new element is based on Modified Couple Stress Theory (MCST). The governing equations of motion and the boundary conditions for the beam are derived and the conventional Galerkin technique is employed to formulate the finite element. The new element can be reduced to Classical Euler-Bernoulli beam element if the size-effect parameter in the element matrices i...
Optimization of AA-Battery Sized Electromagnetic Energy Harvesters: Reducing the Resonance Frequency Using a Non-Magnetic Inertial Mass Yasar, Oguz; Ulusan, Hasan; Zorlu, Ozge; Sardan-Sukas, Ozlem; Külah, Haluk (2018-06-01) This paper presents an optimization study for a miniature electromagnetic energy harvester, by incorporating a non-magnetic inertial mass (tungsten) along with the axially oriented moving magnets. The aim is to decrease the operation frequency and increase the output power of the harvester with the usage of higher density material and larger magnetic flux density. Dimensions of the magnets are optimized according to the harvester dimensions and magnetic flux gradients. Additionally, coil length, width, resi...
Adaptation of turbulence models to a navier-stokes solver Gürdamar, Emre; Aksel, Mehmet Haluk; Department of Mechanical Engineering (2005) This thesis presents the implementation of several two-equation turbulence models into a finite difference, two- and three-dimensional Navier-Stokes Solver. Theories of turbulence modeling and the historical development of these theories are briefly investigated. Turbulence models that are defined by two partial differential equations, based on k-? and k-? models, having different correlations, constants and boundary conditions are selected to be adapted into the base solver. The basic equations regarding t...
Implementation of different flux evaluation schemes into a two-dimensional Euler solver Eraslan, Elvan; Aksel, Mehmet Haluk; Department of Mechanical Engineering (2006) This study investigates the accuracy and efficiency of several flux splitting methods for the compressible, two-dimensional Euler equations. Steger-Warming flux vector splitting method, Van Leer flux vector splitting method, The Advection Upstream Splitting Method (AUSM), Artificially Upstream Flux Vector Splitting Scheme (AUFS) and Roe’s flux difference splitting schemes were implemented using the first- and second-order reconstruction methods. Limiter functions were embedded to the second-order reconstruc...

Citation Formats

Ö. U. Baran, “IMPLEMENTATION, VERIFICATION AND ASSESSMENT OF VORTEX CAPTURING CAPABILITIES OF k-kL TURBULENCE MODEL,” JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY, vol. 42, no. 1, pp. 113–122, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/98081.