光滑槽道分离流动的直接数值模拟
Direct Numerical Simulation of a separated channel flow with a smooth profile
摘要：
对中等雷诺数（进口雷诺数Re_tau = 395）下的单曲面槽道流动进行了直接数值模拟。逆压梯度由壁面曲率通过物理坐标到笛卡尔坐标的数学映射得到。该代码，使用频谱展向和正常的离散化，结合了一个快速的集成程序相比，复杂的几何形状的标准数值计算程序具有良好的精度的优势。湍流在下部弯曲壁的轮廓上略微分离，并且在相对的平坦壁处开始分离。薄分离气泡的特征在于具有反向流动部分。在下壁分离线附近和上壁分离线附近都产生了强烈的旋涡。沿槽道研究了湍流正应力和动能收支。
英文摘要：
A direct numerical simulation (DNS) of a channel flow with one curved surface was performed at moderate Reynolds number (Re_tau = 395 at the inlet). The adverse pressure gradient was obtained by a wall curvature through a mathematical mapping from physical coordinates to Cartesian ones. The code, using spectral spanwise and normal discretization, combines the advantage of a good accuracy with a fast integration procedure compared to standard numerical procedures for complex geometries. The turbulent flow slightly separates on the profile at the lower curved wall and is at the onset of separation at the opposite flat wall. The thin separation bubble is characterized with a reversal flow fraction. Intense vortices are generated near the separation line on the lower wall but also at the upper wall. Turbulent normal stresses and kinetic energy budget are investigated along the channel.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
