IMPACT OF COEFFICIENTS IN MOMENTUM EQUATION ON SELECTION OF INERTIAL MODELS

This paper investigates the impact of beta(momentum flux correction co efficient) and k and k' (piezometric and ambient piezometric pressure correction coefficients) on the selection of four inertial models: non inertial, local inertial, convective inertial, and full inertial. k an d k' do not affect model selection, but beta does. For beta values fro m 1 to 2, the noninertial model always gives a better approximation to the full inertial model than either the local or convective inertial model. When beta value is equal to 1.25 or 1.33, which depends on what kind of resistance formula is applied to represent the friction slope , the noninertial model is exactly the same as the full inertial model .