Numerical Simulation of Flow Around Subsea Covers at high Reynolds Numbers
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The present study investigates turbulent flow over square and trapezoidal wall-mounted subsea covers in single and tandem configuration. The structures under investigation in the single configuration are subjected to a turbulent boundary layer flow at Reynolds numbers of 1.19×10^5and 1×10^6 (based on the height of the structures and the free stream velocity) using Reynolds-averaged Navier-Stokes (RANS) equations combined with the 𝑘���� − 𝜔���� Shear Stress Transport (SST) turbulence model. The mesh independence is assessed and comparisons with the published data are made. The results are found to be reasonably accurate as compared to the published data. Time averaged results for pressure, velocity profiles, bed shear stress and hydrodynamic coefficients around single structures are investigated for different trapezoidal configurations. The structures in tandem configuration are subjected to the same flow conditions as the single structure case at the Reynolds number of 1.19×10^5 using the Reynolds-averaged Navier-Stokes (RANS) equations combined with the 𝑘���� − 𝜔���� Shear Stress Transport (SST) turbulence model. The mesh independence studies with the variation of the normalized gap ratio G/D between the two structures are carried out. Time averaged results for pressure, horizontal velocity profile and hydrodynamic coefficients around structures in tandem are studied with different G/D and trapezoidal configurations.
Master's thesis in Offshore technology : subsea technology