Numerical computation of turbulent flow in a square sectioned $\small{180^{\circ}}$ bend by low-Reynolds-number second moment turbulence closure

Title & Authors
Numerical computation of turbulent flow in a square sectioned $\small{180^{\circ}}$ bend by low-Reynolds-number second moment turbulence closure
Sin, Jong-Geun; Choe, Yeong-Don;

Abstract
A new low Reynolds number nonlinear second moment turbulence closure was introduced to analyze a square sectioned 180.deg. bend flow. Inclusion of nonlinear return to isotropy term and cubic mean pressure strain term has brought out a marked improvement in the level of agreement with measured velocity profiles. Optimization of present closure was performed by comparison of computed velocity profiles with the experimental ones with variation of nonlinear return to isotropy term and quadratic and cubic pressure-strain model. Progressive vortex breakdown due to the interaction of primary and secondary flows was well captured by using the optimized second moment turbulence closure.
Keywords
Second Moment Turbulence Closure;180$\small{^{\circ}}$ Bend Flow;Secondary Flow;Vortex Breakdown;Cubic Mean Pressure Strain Model;
Language
Korean
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