Numerical assessment of stratification influence in simple algebraic turbulence model

0554642 - MÚ 2023 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Uhlíř, V. - Bodnár, Tomáš - Caggio, Matteo
Numerical assessment of stratification influence in simple algebraic turbulence model.
Proceedings of Topical Problems of Fluid Mechanics 2022. Prague: Institute of Thermomechanics AS CR, 2022 - (Šimurda, D.; Bodnár, T.), s. 159-167. ISBN 978-80-87012-77-2. ISSN 2336-5781.
[Topical Problems of Fluid Mechanics 2022. Prague (CZ), 16.02.2022-18.02.2022]
Grant CEP: GA ČR(CZ) GA19-04243S
Institucionální podpora: RVO:67985840
Klíčová slova: stratification * immersed boundary * algebraic turbulence model * artifcial compressibility method
Obor OECD: Pure mathematics
https://doi.org/10.14311/TPFM.2022.022

This paper presents rst few results obtained using a newly developed test code aimed at validation and cross-comparison of turbulence models to be applied in environmental flows. A simple code based on nite di erence discretization is constructed to solve steady flows of incompresible non-homogeneous (variable denstity) fluids. For the rst tests a simple algebraic turbulence model was implemented, containing stability function depending on the stratification via the gradient Richardson number. Numerical tests were performed in order to explore the capabilities of the new code and to get some insight into its behavior under di erent stratification. The two-dimensional simulations were performed using immersed boundary method for the flow over low smooth hill. The resulting flow fields are compared for selected Richarson numbers ranging from stable up to unstable strati cation conditions.
Trvalý link: http://hdl.handle.net/11104/0329340