AN OPENFOAM LIBRARY FOR WALL-MODELLED LARGE-EDDY SIMULATION

Wall-modelled large-eddy simulation (WMLES) is a promising turbulence modelling approach, offering the possibility to simulate higher Reynolds number flows at a lower computational cost, as compared to LES resolving the inner structures of the TBL. In this contribution, a newly developed library for WMLES based on OpenFOAM technology is presented. A short overview of a class of wall models based on predicting the wall shear stress is first given. In particular, two types of such models are focused on: employing algebraic and ordinary differential equations, respectively. This is followed by a description of the class structure of the library and the implemented functionality, which includes models of both above-mentioned classes. Finally, results from WMLES of turbulent channel flow obtained using the library are discussed. The simulations address the influence of the input to the wall model on the resulting prediction of the wall shear stress. The new functionality of the developed library allows for wall model input to be taken at a larger wall distance than the wall-adjacent cell centre. It is shown that this leads to a significant improvement in the predictive accuracy, thus corroborating results from [Kawai and Larsson, 2012].