Method for constructing drag force model between sparse water and sand

Abstract

The present application relates to the field of numerical calculation of water-sand two-phase flow, and provides a method for constructing a drag force model between sparse water and sand phases, comprising: under the condition of sparse water and sand phases, obtaining particle drag force coefficients corresponding to different vorticities under the condition of cyclone to obtain cyclone experimental data; obtaining a first expression of an inertial factor, and obtaining a second expression of a cyclone factor through regression analysis according to the cyclone experimental data; determining a preliminary expression of a cyclone correction function based on the inertial factor, the cyclone factor and the first expression and the second expression thereof; correcting the preliminary expression to obtain a final expression of the cyclone correction function; and obtaining a new drag force model (SCD model) considering the cyclone characteristics based on the final expression of the cyclone correction function and the Wen-Yu model. By introducing the cyclone factor, the drag force model has the response ability to the cyclone characteristics of the flow field, and on the premise of not sacrificing the accuracy of the conventional working condition, the prediction accuracy and engineering applicability in the typical cyclone area of hydraulic machinery are significantly improved.

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