摘要
提出了一种改进的Ghost方法,通过求解双介质的Riemann问题,将全部解参量外推得到虚拟流体状态参量,使单一的气-水间断问题转化为两个单介质的Riemann问题。流场控制方程求解采用二阶NND格式,LevelSet方程用五阶WENO格式离散,实现了对气-水界面稳定而准确的捕捉。激波与气-水界面作用的一维和二维算例验证了程序的有效性。对气液两相均运用可压模型,计算了单个水滴被马赫数为2的空气激波扫过后的二维变形过程。
A modified ghost method is suggested in this paper.Via solving the Riemann problem in multimedia,and extending all the parameters of state to the other side to construct the ghost fluid,we can obtain two Riemann problems in single media.The governing equation is discretized with NND（Non-oscillation Non-dissipation） Scheme,while the Level set equation is solved with 5th WENO algorithm,thus the modified ghost method can capture the interface between gas and water accurately and successfully.1D and 2D cases for the interaction between strong shock and gas-water interface are used to test the validation of the code in this paper.In the end,the process of an air shock at Ma=2 passing a water droplet is calculated using compressible model for both the gas and liquid phases.
出处
《航空计算技术》
2012年第2期27-31,共5页
Aeronautical Computing Technique
基金
国家自然科学基金(青年科学基金)项目资助(11002159)
