Application of multiscale turbulent model in cylinder flow

The unsteady flow around a smooth cylinder under the supper-transition flow region Reynolds number was simulated using the multiscale turbulent model based on the variable interval time average method.The computational results show that the multiscale turbulent model can successfully simulate the lift and drag coefficients,however, standard k-ε model and SST k-ω model can only accurately simulate one of them.This model can also accurately predict vortex shedding characteristics, and its error is smaller than 5.8% of SST k-ω model and 37.6% of standard k-ε model.Also,for the prediction of surface mean pressure coefficient distribution,the error of multiscale turbulent model is only 3.6%,however,the predicted errors using SST k-ω model and standard k-ε model increase to 13% and 53.7%.For the prediction of surface friction factor distribution and the separation angle,the error of separation angle of multiscale turbulent model is only 0.78%.Correspondingly,the predicted errors of standard k-ε model and SST k-ω model are 1.04% and 1.83%.Compared with the experimental results,the results of the multiscale turbulent model are better than those of standard k-ε model and SST k-ω model.So,the study verifies further that this model can be used in simulation of complex turbulence.