An experimental study of periodic surface waves acting against the turbulent currents under the influence of smooth and rough side wall is presented. Flow structure for current alone, and combined wave against current flows over smooth and rough side walls were measured with Acoustic Doppler Velocimeter to resolve the changes in the mean flow and turbulence characteristics resulting from the interaction of the flow and the wall roughness. Turbulent velocity fluctuations were analysed to characterise the turbulence and coherent structures and integral length and time scales were evaluated from the autocorrelation function estimates. Further the Kolmogorov length scales were determined using energy dissipation rate. Results show that the dissipation rate is greater for wave against current flow compared to the current alone flow for rough side walls. The streamwise integral length scale at the measured locations reduced with the increase in wave frequency acting against the current flow. Close to the wall surface, the effect of roughness attenuated the integral length scale and increased the turbulent dissipation rate. Continuous wavelet transform (CWT) was used as a tool to detect and establish the average time and length scales of largest horizontal coherent structures that existed in the wave against current combined flow.

提出了在光滑和粗糙侧壁的影响下，周期性表面波与湍流相互作用的实验研究。用声学多普勒测速仪测量单独的电流的流动结构以及在光滑和粗糙的侧壁上流动的复合波对流，以解决由于流动和壁粗糙度的相互作用而导致的平均流动和湍流特性的变化。分析湍流速度波动以表征湍流和相干结构，并根据自相关函数估计值评估积分长度和时标。此外，使用能量耗散率确定了Kolmogorov长度尺度。结果表明，与粗糙侧壁的单电流相比，波对电流的耗散率更大。随着作用于电流的波频率的增加，在测量位置处的沿流方向的整体长度尺度减小。靠近壁表面，粗糙度的影响减弱了整体长度尺度并增加了湍流耗散率。连续小波变换（CWT）被用作检测和建立波浪中存在的最大水平相干结构相对于当前组合流的平均时间和长度尺度的工具。