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This study deals with the free-surface supercritical flow through a double-right-angled bend (DRAB), which can be found in storm drainage networks in steep terrains. Laboratory experiments showed that strong backwater effects and water-surface oscillations are generated upstream of the DRAB, especially in supercritical flow conditions. This paper i...
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Context 1
... objective was to minimize the summation of squared differences between the measured data and the proposed regression formulas. Table 3 presents the regression coefficients of Equations (5) to (9) along with their corresponding R 2 values. Notably, regression equation no. 9 (Φ 5 ) demonstrates the highest correlation with the measured data, as depicted in Figure 15. the channel's asymmetric contraction inlet and the additional instability induced by the sharp upstream bend of the DRAB, leading to the development of a secondary spiral flow. ...Context 2
... objective was to minimize the summation of squared differences between the measured data and the proposed regression formulas. Table 3 presents the regression coefficients of Equations (5) to (9) along with their corresponding R 2 values. Notably, regression equation no. 9 (Φ5) demonstrates the highest correlation with the measured data, as depicted in Figure 15. Figure 16 plots the maximum nondimensional water depth (yDRAm/yo) upstream of the DRAB versus the far upstream Froude no. ...Context 3
... authors declare no conflict of interest. ν kinematic viscosity of water (L 2 /T) Φ 1 to Φ 5 regression functions, Equations (5)-(9), Table 3 logSyy5 = log10(Syy(K:K5,1)); logf5 = log10(f(K:K5,1)); logSyy10 = log10(Syy(K:K10,1)); logf10 = log10(f(K:K10,1)); b_full = polyfit(logf, logSyy, 1); Slp_full = b_full(1); b_5 = polyfit(logf5, logSyy5, 1); Slp_5 = b_5(1); b_10 = polyfit(logf10, logSyy10, 1); Slp_10 = b_10(1); mdl_full = fitlm(logf,logSyy); RSQ_full = mdl_full.Rsquared.Ordinary; mdl_5 = fitlm(logf5,logSyy5); RSQ_5 = mdl_5.Rsquared.Ordinary; mdl_10 = fitlm(logf10,logSyy10); RSQ_10 = mdl_10.Rsquared.Ordinary; ...