Square-Section Duct 180 Degree Bend

Experiments by Choi

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Turbulent flow in a square cross-section duct made of a 180o bend and two long straight inlet and outlet parts. 3D flow with constant temperature.

Geometry of the Computational Domain

180o bend section connected to straight inlet and outlet tangents, all of square section: D × D = 88.9 × 88.9 mm. Centreline curvature radius of the bend: Rc = 3.357D.


Flow Parameters

Air at standard conditions.

Inflow Conditions

The following measurements are available for the cross section located at z = -D. They correspond to a fully developed turbulent in a square section duct.

Contour maps as f(x,y) of:

Additional values of k and epsilon issued by numerical simulations are also available in the file input.

Experimental Details

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Velocity measurements using a rotatable hot-wire probe.

Measurement Errors

Analyzed but no published values.

Available Measurements

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Contour maps at 5 different angular positions (ucpsi = 0o, 45o, 90o, 135o, 180o) of:

Previous and Reference Numerical Solutions

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None available yet.

Main References

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  1. CHOI, Y.D., MOON C. & Yang, S.H. (1990). Measurment of turbulent flow characteristics of square duct with a 180 degree bend by not wire anemometer. International Symp. on Engineering Turbulenze modelling and measurement, (no page numbers).
  2. CHOI, Y.D., IACOVIDES, H. & LAUNDER, B.E. (1989). Numerical computation of turbulent flow in a square-sectioned 180 deg bend. J. Fluids Engg 111, 59, (see Chang, Physico-Chem. Hydr. 4, 243, 1983 for expts.).
  3. SOTIROPOULOS, F. AND PATEL, V.C. (1993). Evaluation of some near-wall models for the reynolds-stress transport equations in a complex 3-d shear flow. Near wall turbulent flows, pp. 987.