Author(s): H. Zobeyer; P. M. Steffler
Linked Author(s):
Keywords: Open channel flow; Depth averaged model; Reynolds averaged Navier-Stokes (RANS) model
Abstract: A coupled depth averaged (DA) and Reynolds averaged Navier-Stokes (RANS) model is developed where at first the water surface and DA velocity are modeled by a DA model neglecting non uniform velocity (NUV) and non hydrostatic pressure (NHP) which are then used as input to the RANS model with the computed water surface as a fixed boundary. A correction term is introduced in the RANS horizontal momentum equations and modeled such that the mean of the computed RANS horizontal velocity profile is equal to the DA velocity. Once the RANS model results are available, water surface and DA velocity are updated by incorporating the effects of NUV and NHP in the DA model. This feedback is repeated until a specified criterion is met. The model is developed and tested for 2D plane flow. The agreement between the model and experimental results is quite satisfactory with excellent computational efficiency.
Year: 2011