Enhancement of an Industrial Finite-Volume Code for Large-Eddy-Type Simulation of Incompressible High-Reynolds Number Flow Using Near-Wall Modelling

Kurzfassung

We present a validation strategy for enhancement of an unstructured industrial finite-volume solver designed for steady RANS problems for large eddy-type simulation with near-wall modelling of incompressible high-Reynolds number flow. Different parts of the projection-based discretisation are investigated to ensure LES capability of the numerical method. Turbulence model parameters are calibrated by using a minimisation of least-squares functionals for first and second order statistics of the basic benchmark problems decaying homogeneous turbulence and turbulent channel flow. Then the method is applied to the flow over a backward-facing step at Re_h=37500. Of special interest is the role of the spatial and temporal discretisation error for low order schemes. For wall-bounded flows, present results confirm existing best practice guidelines for mesh design. For free shear layers, a sensor to quantify the resolution quality of the LES based on the resolved turbulent kinetic energy is presented and applied to the flow over a backward-facing step at Re_h=37500.