Abstract
A new finite-element technique for three-dimensional turbulent flow analysis based on the two-equation turbulence model was applied using a supercomputer, to internal flows in a water turbine draft tube. Predicted results were compared with the experimental flow pattern from the oil film method, and the total loss was measured by a pitot tube. Compared with the oil film, the occurrence of reverse flow, the main flow behaviour, and the secondary flow direction, were adequately predicted, but the flow pattern at the reverse flow section did not have good agreement. Using a finer mesh improved the flow pattern for the reverse flow. Regarding the total loss, the predicted loss was about twice the measured loss, and use of the finer mesh improved the predicted loss.
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