CAJ | 학술논문

采用ANSYS FLUENT14.5分析湍流模型对过冷沸腾的影响，建立多套网格，每套网格采用不同的湍流模型、壁面函数及两相湍流处理方法，将计算结果与基准实验数据进行对比，分析网格、湍流模型、壁面函数及两相湍流处理方法对计算精度的影响。通过分析发现：k‐ε模型的计算精度高于k‐ω模型的；Dispersed 方法和 Per Phase方法的计算精度相对于 Mixture的无明显提升；增强壁面函数对Y ＋≈1的网格无法获得满意的计算结果。
채용ANSYS FLUENT14.5분석단류모형대과랭비등적영향，건립다투망격，매투망격채용불동적단류모형、벽면함수급량상단류처리방법，장계산결과여기준실험수거진행대비，분석망격、단류모형、벽면함수급량상단류처리방법대계산정도적영향。통과분석발현：k‐ε모형적계산정도고우k‐ω모형적；Dispersed 방법화 Per Phase방법적계산정도상대우 Mixture적무명현제승；증강벽면함수대Y ＋≈1적망격무법획득만의적계산결과。
The ANSYS FLUENT14.5 was employed to simulate the two‐phase forced convection subcooled boiling in a vertical heated pipe .Different turbulence models ,wall functions and two‐phase turbulence treatments were utilized to each of four sets of grids .Results were compared with experiment data to analyze the effects of grids , turbulence model ,wall functions and two‐phase turbulence treatments .The results of k‐εmodel show better agreement with experiment data than those of k‐ωmodel .Dis‐persed and Per Phase treatments for two‐phase turbulence parameters perform no better than Mixture treatment .The enhanced wall function can’t achieve satisfactory results for the grid with near wall function Y + ≈1 .