In order to reduce or eliminate the non-physical pressure spike of gas-liquid interface crossing cell edges in vertical stratified flow calculation of RELAP5 and to improve the stability of the calculation,this study investigates the causes of pressure spikes in the vertical stratified flow from the perspective of momentum equations,and proposes a method to reduce the pressure spikes by directly correcting the momentum equations.It is found that the liquid phase unsteady term is the main cause of such pressure spikes.Based on this,a numerical method for correcting the liquid phase unsteady term is developed and validated with a vertical pipe filling and discharging problem and a manometer problem.The validation results show that the correction method can achieve the effect of reducing the non-physical pressure spikes in the process of the gas-water interface crossing cell edges,and therefore,it is beneficial to improve the stability of the code calculation.
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