二维超声速横侧喷流湍流数值模拟

采用AUSM -up格式模拟了二维超声速横侧喷流干扰流场.比较了SA、SST和EASM湍流模型对分离流动的模拟精度.通过调节喷流出口压力,研究了喷流参数对分离区大小、物面压力分布以及喷流喷射高度的影响.同实验对比发现:SST和EASM湍流模型在低压力比下能够比较准确模拟分离区,但是在高压力比下,湍流模型对分离区的模拟精度较差.

Simulation of two dimensional supersonic flow with cross jet interaction using different turbulence models

The two-dimensional supersonic flow with transverse jet interactions is simulated by solving the N-S equations.The high resolution,low dissipation upwind AUSM~+-up scheme is used to simulate the complex flows,which can obtain second-order accuracy via MUSCL extrapolations.One-equation SA,linear two equation SST and nonlinear EASM turbulence models are investigated in detail on simulating separated flows.Streamlines distribution near the jet exit clearly describe the subtle horse-shoe vortical flow structure,jet wake and complex jet plume. According to surface pressure distribution,compared with the experimental data of Spaid,it can be concluded that turbulent models are vital to simulation separation flow ahead of jet.And different models show great difference.Results show that two equation turbulence model can predict correctly the separated region at low static pressure ratios,however,at high static pressure ratio,the upstream separation extend and conventional two equation turbulent models can't resolve the flow exactly.This phenomenon can interpreted with the strong adverse pressure gradients in upstream boundary layer of the jet.