Experimental investigation of the turbulent wake of partially submerged horizontal circular cylinders

• DOI: 10.1016/j.ijheatfluidflow.2024.109509
• Publication Date: 2024-07-25T14:21:39Z
• Authors: Mark K. Israel; Karen Dow; Shawn P. Clark; Mark F. Tachie
• Keywords: Mean flow

Time-resolved particle image velocimetry was used to study the wake characteristics of partially submerged horizontal circular cylinders. Two submergence levels, namely 50% and 75% cylinder, blockage ratios 5% 9% were examined at a Reynolds number 10 000. The results from cases are compared reference case cylinder fully immersed deep in uniform flow. analyzed terms instantaneous mean flow, shear layer growth, stresses, turbulence transport while unsteady using frequency spectra temporal autocorrelation coefficients fluctuating velocities, proper orthogonal decomposition (POD), reverse flow areas. show that distinct recirculation bubbles form size bubble increases linearly with level. levels enhanced when ratio is increased but not significantly affected by changes Regardless level, substantially larger, lower case. In case, first two POD modes make similar energy contributions mainly vertical velocity fluctuations cases, most comes streamwise contribution mode 1 three times as large 2. degree correlation, assessed through cross-correlation coefficient, between flapping motion higher for varies level ratio. dominant dimensionless frequencies (based on length) both configurations consistent reported values separated flows induced wide range bluff body geometries.