Calculation of the Flow Through a Single-Sided Sudden Expansion with the Computer Program for Parabolic and Elliptic Flows (Coppef) Computer Program

摘要

The implementation of the single-sided sudden expansion configuration in the Computer Program for Parabolic and Elliptic Flows (COPPEF) is described. Modifications of the computer program were tested and calculations describing the cold flow through a single-sided sudden expansion were carried out. The calculations show that the flow structure and the reattachment length in particular are very sensitive to the inlet flow conditions. Reattachment length is found to vary linearly with the expansion ratio. At high Reynolds numbers, the calculated reattachment length is hardly affected by changing the Reynolds number. Varying the length of the solution domain has no significant effect on the calculated reattachment length. Comparison of the results with experimental data show that COPPEF can calculate the flow through a single-sided sudden expansion in reasonable agreement with experiment. The calculated reattachment length is in close agreement to the reattachment lengths obtained with computer proframs which use the same turbulence closure model as COPPEF.