Numerical tests of far-field boundary conditions for stably stratified flows

0508008 - MÚ 2020 RIV CZ eng C - Conference Paper (international conference)
Bodnár, Tomáš - Fraunié, P. - Řezníček, Hynek
Numerical tests of far-field boundary conditions for stably stratified flows.
Proceedings of Topical Problems of Fluid Mechanics 2019. Praha: Institute of Thermomechanics of the Czech Academy of Sciences, 2019, s. 17-24. ISBN 978-80-87012-69-7. ISSN 2336-5781.
[Topical Problems of Fluid Mechanics 2019. Prague (CZ), 20.02.2019-22.02.2019]
R&D Projects: GA ČR GA16-03230S
Institutional support: RVO:67985840
Keywords : boussinesq approximation * stable stratification * far-field boundary condition
OECD category: Pure mathematics
http://www.it.cas.cz/fm/im/im/proceeding/2019/3

This numerical study presents the results of simulations of stably stratified wall-bounded flows. The effect of artificial far-field boundary conditions is studied in detail. The standard homogeneous Neumann condition for pressure is replaced by a non-homogeneous condition depending on local velocity and its gradient. The two-dimensional tests are performed for the case of flow over a low isolated hill. The simulations on computational domains with three different heights are discussed to evaluate the performance of the new far-field artifcial boundary condition. The model is based on Boussinesq approximation of non-homogeneous Navier-Stokes equations, solved using artificial compressibility method, looking for a steady solution.
Permanent Link: http://hdl.handle.net/11104/0298966