《Tab.1 Mesh independence verification》

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《基于FBM模型的轴流泵空化流动特性CFD分析》

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The structural mesh of each part of the axial flow pump is divided by ANSYS ICEM，in which the runner and guide vane are divided by periodic mesh（Fig.2）.The number of grids can affect the calculation results to a certain extent，so the grid independence verification was carried out.Due to the cavitation numerical simulation of the water pump，the lowest pressure value on the blade surface was taken into account，and the FBM model was used to simulate the pump device under the design flow.The calculation results are shown in Tab.1.It can be seen from the table that the efficiency，water head，and the minimum pressure on the blade surface tend to be stable with the increase of grid number，and the increase of gridnumber has no significant impact on the calculation results.The calculation results of the latter three schemes were basically the same，but the calculation time was longer due to a large number of grids in scheme 4and scheme 5.Thus scheme 3was finally selected.