水流與壁面間切應(yīng)力估計(jì)方法的比較研究
[Abstract]:Accurate estimation of shear stress between water flow and wall is of great significance in sediment transport and water conservancy engineering safety. By selecting and sorting out the literature data, seven main methods for estimating shear stress between water flow and wall are evaluated and compared under different Reynolds numbers. It is found that the overall reliability and accuracy of the turbulent kinetic energy extrapolation method and the Reynolds stress extrapolation method are the highest, and the average relative errors are 3.2% and 5.2%, respectively. Turbulence energy method, turbulent kinetic energy method and Reynolds stress method take the second place, the accuracy of wall theorem is the lowest, but the required data are easy to obtain. The accuracy of the second order stress method depends on the value of the resistance coefficient. Among them, the wall theorem and the second-order stress method are higher and more secure. The extrapolation method of turbulent kinetic energy is more accurate, while the other methods give lower estimates. The results are useful for the selection of shear stress estimation methods between water flow and wall and the calibration of direct measuring instruments.
【作者單位】: 河海大學(xué)水利水電工程學(xué)院;英國(guó)鄧迪大學(xué)土木工程系;河海大學(xué)水文水資源學(xué)院;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(41471014)
【分類號(hào)】:TV131.3;TV14
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