CAJ | 학술논문

湍流脉动压力是重要的流噪声声源，对其进行数值计算是流声耦合领域的重要课题，开展相应的研究十分必要。文章采用大涡模拟方法（LES）结合四种亚格子涡模型与四套网格，对槽道壁面湍流脉动压力进行了数值计算，并与试验结果进行了对比分析，验证了数值计算方法的可靠性。首先，介绍了大涡模拟的物理内涵与基本方程，给出了常用亚格子涡模型的表达式，并给出了相应的离散求解数值方法以及边界条件的设置。其次，描述了槽道试验段的几何特征，给出了网格的剖分形式。最后，详细讨论了槽道壁面湍流脉动压力频谱计算值与试验值之间的差异，进行了定量与定性的比较分析，同时分析了涡旋结构与近壁面流速分布，研究了亚格子涡模型与网格数量对计算结果的影响，为今后复杂几何模型壁面湍流脉动压力及其频率-波数谱的计算研究工作奠定了基础。
단류맥동압력시중요적류조성성원，대기진행수치계산시류성우합영역적중요과제，개전상응적연구십분필요。문장채용대와모의방법（LES）결합사충아격자와모형여사투망격，대조도벽면단류맥동압력진행료수치계산，병여시험결과진행료대비분석，험증료수치계산방법적가고성。수선，개소료대와모의적물리내함여기본방정，급출료상용아격자와모형적표체식，병급출료상응적리산구해수치방법이급변계조건적설치。기차，묘술료조도시험단적궤하특정，급출료망격적부분형식。최후，상세토론료조도벽면단류맥동압력빈보계산치여시험치지간적차이，진행료정량여정성적비교분석，동시분석료와선결구여근벽면류속분포，연구료아격자와모형여망격수량대계산결과적영향，위금후복잡궤하모형벽면단류맥동압력급기빈솔-파수보적계산연구공작전정료기출。
Turbulent wall pressure fluctuations beneath turbulent boundary layers are important source of flow noise. The computation of wall pressure fluctuations is a hot topic in the field of flow-sound coupling. It is necessary to carry out corresponding research. In this paper, wall pressure fluctuations of a tunnel wall is computed using large eddy simulation (LES) with four different sub-grid scale models and four sets of meshes of different grid number. The results are compared with the experiment of Abraham and discussed in detail. Firstly, some fundamentals of the numerical simulation are presented, including the philosophy of LES, for-mulations of different sub-grid scale models, discretization methods and boundary conditions, etc. Then, the rectangular test section of the tunnel and its computational domain are depicted. Finally, the computed spec-trum of the wall pressure fluctuations is compared with that of Abraham’s experiment and analyzed qualita-tively and quantitatively. The effects of different sub-grid scale models and different grid numbers are also discussed in detail. Groundwork is made for further research in turbulent wall pressure fluctuations.