Shahid Chamran University of AhvazIrrigation Sciences and Engineering2588-595237220140723Experimental and Numerical Study of Shock Waves in ContractionsExperimental and Numerical Study of Shock Waves in Contractions12513410952FAMohammadreza NikpoorDavood FarsadizadehAli Hosseinzadeh DalirJavad BehmaneshFarinaz ShojaJournal Article20130407 Shock waves are often occurring during passage of supercritical flow in the non-prismatic channels. In the present study, values of height and instantaneous velocities were measured in various points of shock waves observed in two contractions with fixed convergence ratio and convergence angles of 7.6 and 21.3 degrees for four Froude Numbers (models 1 and 2). <em>RNG</em><em>k-ε </em>and <em>RSM</em> turbulence models were used for <br />3-D simulation. The average relative errors of wave profile calculation for Fr<sub>1</sub>=7.0 using the mentioned turbulence models were 1.82% and 1.06% for the model 1, 3.46% and 2.67% for the model 2, respectively. Also, wave velocity values were 2.35% and 1.44% for the model 1, 5.75% and 3.23% for the model 2, respectively. The results showed that the <em>RSM</em> model performed slightly better than <em>RNG</em><em>k-ε </em>model in simulating of shock waves. Shock waves are often occurring during passage of supercritical flow in the non-prismatic channels. In the present study, values of height and instantaneous velocities were measured in various points of shock waves observed in two contractions with fixed convergence ratio and convergence angles of 7.6 and 21.3 degrees for four Froude Numbers (models 1 and 2). <em>RNG</em><em>k-ε </em>and <em>RSM</em> turbulence models were used for <br />3-D simulation. The average relative errors of wave profile calculation for Fr<sub>1</sub>=7.0 using the mentioned turbulence models were 1.82% and 1.06% for the model 1, 3.46% and 2.67% for the model 2, respectively. Also, wave velocity values were 2.35% and 1.44% for the model 1, 5.75% and 3.23% for the model 2, respectively. The results showed that the <em>RSM</em> model performed slightly better than <em>RNG</em><em>k-ε </em>model in simulating of shock waves.https://jise.scu.ac.ir/article_10952_77659b0ced5ecbabd7c7e7c033f338f7.pdf