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DISCUSSION

S.A.Kinnas

University of Texas at Austin, USA

The authors should be commended for their efforts to implement a panel method for the prediction of unsteady propeller cavitation. A very similar method was presented at the 19th CNR Symposium on Naval Hydrodynamics (1992) by Kinnas and Fine. It would be interesting to hear the author's comments on the following issues:

  1. How do they determine the cavity detachment point?

  2. How do they plan to improve the slow convergence of the predicted cavity platform (see Fig.9)? In the work mentioned above we found that we had to develop a special treatment of the panel at which the cavity ends (the so-called “split-panel”) in order to improve the convergence.

  3. From Figures 4 and 18 it appears that they have only used 10 panels in the spanwise direction. Has this been found to be sufficient for predicting the cavity shapes on the propeller, especially since they show that their predicted cavity shapes converge slowly with number of panels?

It would be nice to include in their reply a convergence study with number of panels for one of the propellers for which they compare their results with measurements.

AUTHORS' REPLY

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