Paper detail

A quasi-dynamic one-equation model with joint constraints of kinetic energy and helicity fluxes for large eddy simulation of rotating turbulence

For settling the problem with rotating turbulence modelling, a quasi-dynamic one-equation subgrid-scale (SGS) model is proposed in this paper. Considering the key role of the joint cascade of kinetic energy and helicity in rotating turbulence, the new SGS model is constrained by the fluxes of kinetic energy and helicity. Specifically, the new theory of dual channels of helicity flux is taken into account. The modelling of the unclosed quantities is achieved by adopting a quasi-dynamic process that eliminates the need for test filtering compared to the classic dynamic process, and the model coefficients are dynamically obtained through the SGS kinetic energy transport equation and considering the joint constraints of kinetic energy and helicity fluxes. As a result, the model demonstrates a high correlation with DNS data in a priori tests. We refer to this new model as the quasi-dynamic joint-constraint model (QCM), which is introduced for both incompressible and compressible flows. To assess the effectiveness of the QCM, numerical experiments are conducted for three typical cases: incompressible streamwise rotating channel flow, transonic streamwise rotating annular pipe flow, and hypersonic transition flow at Mach 6 over a rotating cone. The results suggest that the QCM has the potential to significantly improve the prediction of rotational flows that are strongly influenced by helicity. Additionally, the new model demonstrates excellent capability in handling the transition process.