The flow field, resultant force, and aerodynamic torque on a butterfly valve with a symmetric disc are studied computationally at disc positions 45° and 70° over a range of operating pressure ratios that include subsonic and supersonic flow states. The aerodynamic torque coefficients were predicted using a k-ε RNG turbulence model and were compared to test data at both 45° and 70° over a range of operating pressure ratios. The numerical results were generally in good agreement with test data, although a few disparities existed. The computational results were obtained using Fluent 6.0 and were performed on a Dell Precision workstation with dual Xeon processors.

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