We performed steady state calculations in Profitis Daniil Stream, an important component of the combined sewerage system of Athens. We employed the Standard Step Method (SSM), 1D HEC-RAS and TELEMAC-2D to define the boundary conditions, mainly water depths, of a 3D CFD model that is used to optimize the design of a diversion work. As expected, water depths predicted by SSM and 1D HEC-RAS coincide; also, these are generally close to TELEMAC-2D calculations for turbulent viscosity values in the range of 0.005 m2 s-1 with the exception of regions with changing bottom slope, where water surface is more accurately predicted by TELEMAC-2D. Thus, we can use 1D approaches to define water depths as boundary conditions in regions without significant bottom slope changes; otherwise, we need to use TELEMAC-2D with proper viscosity values that additionally provides a realistic depth-average velocity profile, when required.     «

We performed steady state calculations in Profitis Daniil Stream, an important component of the combined sewerage system of Athens. We employed the Standard Step Method (SSM), 1D HEC-RAS and TELEMAC-2D to define the boundary conditions, mainly water depths, of a 3D CFD model that is used to optimize the design of a diversion work. As expected, water depths predicted by SSM and 1D HEC-RAS coincide; also, these are generally close to TELEMAC-2D calculations for turbulent viscosity values in the r...     »