| At present,hypersonic aircraft has been paid more and more attention by military powers,and it has been the key weapon of war.The accurate prediction of turbulent/transition problem is an important factor for restricting the development of hypersonic aircraft.This paper has developed an accurate and fast hypersonic transition model,which is improved by ?-Re? transition model,with WCNS high-order scheme.The ?-Re? transition model is a transition model based on local variables.In this paper,?-Re? transition model is combined with SST turbulence model to construct a four-equation model.The research content of this paper is mainly divided into three parts.Firstly,we have studied the SST turbulence model.The performance of SST turbulence model was compared under second-order MUSCL scheme and WCNS high-order scheme.And the advantages of using WCNS high-order scheme to simulate turbulent/transition problem were obtained,which can not only reduce the quantity of grid and the cost of computing,but also have a higher resolution of field.Then,the performance of various SST compressible correction methods,which is proposed by Zeman,Wilox,Brown and Catris,in hypersonic turbulence simulation is evaluated.But it is difficult to find a good modified method that can be well performed in hypersonic mixing layer and hypersonic plate.Therefore,combining SST-Brown and SST-Den,this paper has proposed a compression correction method,in terms of SST-comp,which is proved by examples.Secondly,based on WCNS high-order software platform,?-Re? transition model is constructed.And its empirical formulas are calibrated.What's more,the hypersonic modification of ?-Re? transition model is studied,which is verified in hypersonic cases.Finally,the combination of ?-Re? transition model and LST was explored.And the combination of both was successfully realized in the S&K case,which reduced the dependence of ?-Re? transition model on empirical formulas,and was able to predict the transition accurately and quickly. |
PDF Full Text Request