Accession Number : ADA115718

Title :   Theoretical Modeling of Fluid Interactions Produced by Ship Bow Thrusters.

Descriptive Note : Master's thesis,


Personal Author(s) : Cooper,Thomas Charles

PDF Url : ADA115718

Report Date : Mar 1982

Pagination or Media Count : 116

Abstract : An analytical model of a jet injected normally from a flat plate into a uniform crossing flow was modified to provide an improved method of predicting the interference effects arising from the complex flow fields induced by ship bow-thrusters. This model is an extension of previous work based upon a description of the jet as a series of distributed vortices. The analysis takes into account the position of the effective source of the jet and the blockage due to presence of the jet in the crossflow. Improvement in the predicted pressure distribution on the plate was obtained by adopting a new formula for determining the effective jet source which more closely approximates the experimental results. Further improvement resulted from the incorporation of a symmetric foil shape to simulate the presence of the jet and its highly turbulent wake. The accuracy of the model was evaluated for representative jet-to-crossflow velocity ratios. Good agreement with experimental results was achieved for large portions of the interaction field with particular improvement in the near-field and downstream regions.

Descriptors :   *Flow fields, *Interference, *Ship bows, *Thrusters, *Mathematical models, Jet flow, Cross flow, Plates, Pressure distribution, Computer programs, Computerized simulation, Velocity, Ratios, Interactions, Fluids, Theses

Subject Categories : Numerical Mathematics
      Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE