*In this work, the application of a shear stress transport based-RANS/LES turbulence modelling approach on a fluid-structure interaction benchmark is considered after a transient computation of turbulent flow over the configuration on an LES quality mesh is to be performed. Within the unsteady decoupled simulation the scale resolving method successfully produces complex unsteady eddy sizes behind the reference test case, giving a Strouhal number of 0.184 which is close to a reference value of 0.18 at a subcritical Reynolds number. In this scenario, a rubber added on the back part of a fixed circular cylinder is treated as a rigid thin plate during the pure flow simulation. On the LES grid resolution, the shielding function resided in the hybrid limiter of the scale resolving formulation is found to be strong to safeguard the activation of the RANS mode in the near wall region where the demarcation line between the RANS and LES modes uniquely resembles the geometry. Moreover in the FSI simulation, resolved turbulence scales interacting with moving and deforming rubber immersed in the subcritical Reynolds number-turbulent flow are successfully captured by the hybrid modelling technique coupled with a structural solver under the procedure of an implicit partitioned approach. Similar with earlier studies with different scale-resolving proposals on the same FSI case, a periodic oscillating motion of the rubber that is produced from a phase-averaging method is also demonstrated in this present investigation. Nevertheless, a non-physical deformation of the rubber in the spanwise direction occurs. The new FSI result is evaluated with existing results from earlier works as a pivotal basis for further researches, such as implementations of new mesh stiffness model and filter width.*

An FSI configuration comprising a fixed circular cylinder with a rubber attached at the rear of the front body was introduced by Kalmbach (2015), aiming at providing a reference for studying the performance of scale resolving turbulence models. The FSI test case of Kalmbach (2015) has been used by Ali (2017) and Kondratyuk (2017) to investigate the performances of k-e-z-f Delayed Detached Eddy Simulation (DDES) of Reimann (2013), k-e and z-f based-Very Large Eddy Simulations (VLES) with implicit coupling strategies. It was proven the superiority of the hybrid turbulence approaches to resolve turbulence scales over the FSI geometry of Kalmbach (2015) and to produce a realistically periodic oscillation of the rubber in the turbulent-FSI computations of Ali (2017) and Kondratyuk (2017). However, with a coarse mesh designed for URANS simulation under-predictions of the oscillating motion of the rubber are reported by Ali (2017) and Kondratyuk (2017). Interestingly, what is critical is that non-standard-filter widths D~vol~ are found to be more accurate than standard-filter width D~max~ as explained by Türk (2014) and Kondratyuk (2017).

                In the present study, the main part focuses on the applications of SBES model of ANSYS (2016) and the implicit coupling technique to simulate a turbulent flow at a subcritical Reynolds number over the FSI benchmark of Kalmbach (2015). The turbulent-FSI simulation with the SBES model is performed after a transient flow computation with the same scale-resolving scheme on an LES quality mesh is concluded. The SBES model is relatively new in which the hybrid technique is not much explored in the contexts of stationary and moving meshes and has, in particular, an interesting conceptualization of the filter width or grid spacing D which combines the standard and non-standard grid spacing.

Keywords: fluid-structure interaction, hybrid turbulence model, turbulent flow


Fluid Structure Interaction Simulation of a Benchmark Configuration With a Stress Blended-Eddy Simulation Model

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Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2020/volume/84478

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