Original title: Implementation of wall functions into a hybrid fictitious domain-immersed boundary method
Authors: Kubíčková, Lucie ; Isoz, Martin
Document type: Papers
Conference/Event: Seminar on Numerical Analysis, Ostrava (CZ), 20230123
Year: 2023
Language: eng
Abstract: Hybrid fictitious domain-immersed boundary method (HFDIB) is a simulation approach used in computational fluid dynamics. The approach avoids usage of complex geometry-conforming computational domains. Instead, a simple domain is used and the geometry is projected onto it by a scalar field and adjustment of governing equations. Hence, the time spent on mesh generation is substantially reduced. It is advantageous to use the HFDIB in geometry optimizations where it allows for a massive optimization speed-up. Nevertheless, there is a problem with simulation of the fluid behavior in the boundary layer in the vicinity of the immersed walls. Especially, in simulation of highly turbulent flows, where the boundary layer is very thin and the usage of finer mesh is unaffordable. In this work, we aim to solve this problem by implementation of Reynolds averaged turbulence models in our custom HFDIB variant. In particular, we implemented the k-ω turbulence model and blended wall functions for closure variables and velocity.
Keywords: CFD; immersed boundary method; RAS; wall functions
Host item entry: SNA'23 Seminar on Numerical Analysis, ISBN 978-80-86407-85-2

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: https://www.ugn.cas.cz/event/2023/sna/files/sna23-sbornik.pdf
Original record: https://hdl.handle.net/11104/0350356

Permalink: http://www.nusl.cz/ntk/nusl-539230


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