Publication detail

Circular Free Jets: CFD Simulations with Various Turbulence Models and Their Comparison with Theoretical Solutions

KMECOVÁ, M. ŠIKULA, O. KRAJČÍK, M.

Original Title

Circular Free Jets: CFD Simulations with Various Turbulence Models and Their Comparison with Theoretical Solutions

Type

conference paper

Language

English

Original Abstract

The theory of turbulent free jet is fundamental for the design of comfort ventilation, as free jets frequently occur in mixing and personalized ventilation systems and their characteristics strongly influence the air quality in the breathing zone of an occupant. The aim of this research is to provide recommendations that help researchers and practitioners improve the accuracy and reliability of their computational models of ventilation systems involving circular free jets. To accomplish this, a review of existing theoretical calculation models is performed, and these models are subsequently investigated by computational fluid dynamics. The theoretical solutions of free jets are compared with CFD simulations using various turbulent models such as the standard k-epsilon model, the k-epsilon realizable model, the standard k-omega model, the shear stress transport (SST) k-omega model, and the Reynolds stress model (RSM). The simulated models are represented by profiles of the centreline velocity for a free jet emanating from a round nozzle, because such presentation of the data proved to be particularly helpful for the comparison of the turbulence models. The k-omega SST turbulence closure scheme with standard coefficients produced results of the centreline velocity closest to the average of theoretical solutions investigated, whereas the discrepancy between the simulations and the theoretical models was about 60 % with the k-epsilon standard turbulence model.

Keywords

free stream; CFD simulation, turbulence models; comparison

Authors

KMECOVÁ, M.; ŠIKULA, O.; KRAJČÍK, M.

Released

25. 2. 2019

Publisher

IOP Publishing Ltd

Location

Bristol United Kingdom

ISBN

1757-899X

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

471

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

https://iopscience.iop.org/article/10.1088/1757-899X/471/6/062045

Full text in the Digital Library

http://hdl.handle.net/11012/138146

BibTex

@inproceedings{BUT155821,
  author="Miroslava {Kmecová} and Ondřej {Šikula} and Michal {Krajčík}",
  title="Circular Free Jets: CFD Simulations with Various Turbulence Models and Their Comparison with Theoretical Solutions",
  booktitle="WMCAUS 2018",
  year="2019",
  journal="IOP Conference Series: Materials Science and Engineering",
  volume="471",
  number="1",
  pages="1--8",
  publisher="IOP Publishing Ltd",
  address="Bristol United Kingdom",
  doi="10.1088/1757-899X/471/6/062045",
  issn="1757-899X",
  url="https://iopscience.iop.org/article/10.1088/1757-899X/471/6/062045"
}

Documents

Kmecova_2019_IOP_Conf._Ser.__Mater._Sci._Eng._471_062045.pdf