Digital Library of the European Council for Modelling and Simulation

Title:	Towards Immersed Boundary Methods For Complex Roughness Structures In Scale-Resolving Simulations
Authors:	Konrad M. Hartung, Philipp Gilge, Florian Herbst
Published in:	(2018). ECMS 2018 Proceedings Edited by: Lars Nolle, Alexandra Burger, Christoph Tholen, Jens Werner, Jens Wellhausen European Council for Modeling and Simulation. doi: 10.7148/2018-0005 ISSN: 2522-2422 (ONLINE) ISSN: 2522-2414 (PRINT) ISSN: 2522-2430 (CD-ROM) 32nd European Conference on Modelling and Simulation, Wilhelmshaven, Germany, May 22^nd – May 26^5h, 2018
Citation format:	Konrad M. Hartung, Philipp Gilge, Florian Herbst (2018). Towards Immersed Boundary Methods For Complex Roughness Structures In Scale-Resolving Simulations, ECMS 2018 Proceedings Edited by: Lars Nolle, Alexandra Burger, Christoph Tholen, Jens Werner, Jens Wellhausen European Council for Modeling and Simulation. doi: 10.7148/2018-0359
DOI:	https://doi.org/10.7148/2018-0359
Abstract:	In many technical applications the effect of surface roughness on the local flow as well as on integral char-acteristics is significant. Understanding and modeling their effect is an ongoing challenge as there are plenty of surface structures caused by intention, manufactur-ing, or wear which have different or even contrary ef-fects on the boundary layer flow. Scale-resolving simu-lations like direct numerical simulations are a valuable tool in this context as they provide highly-resolved view of the local effect of roughness on the flow. However, complex surface structures pose challenges to the gen-eration of commonly used body-fitted structured com-putational grids. Immersed boundary methods (IBM) are a promising tool for bypassing this challenge. In this paper the IBM implemented in the CFD-solver OpenFOAM is qualified for scale-resolving simulations of turbulent channel flows over rough surfaces by intro-ducing an additional mass-flow controller. By means of three characteristic test-cases the direct numerical sim-ulations with IBM are verified against corresponding simulations with body-fitted grids. The excellent quan-titative prediction of average flow quantities as well as turbulent statistics demonstrate the suitability of the method for the simulation of turbulent flows over arbi-trary complex rough surfaces.
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