LAUSR

Abstract In this work, the analysis of thermal–hydraulic boiling flow in a vertical channel under static along rolling and heaving motions is investigated by using the drift-flux model. A code called DAFNO, based on the staggered finite volume technique to discretize governing equations in the drift-flux model is developed; Newton method is implemented to solve a non-linear system of equations and to prevent non-physical velocity and pressure results, fully implicit scheme is enforced for the temporal and spatial step of the equations. Various test problems are chosen to evaluate the performance of DAFNO; four experimental flow boiling channel data under static conditions are compared with DAFNO numerical results which show a very good agreement. Furthermore, void fraction, critical heat flux, and the drift velocity of vapor phase, under various rolling and heaving conditions are examined. It is observed that flow fluctuation modeling results are consistent with other complicated methods.