Turbulent Flow Past a Self-Propelled Vehicle. I. Formulation. Revision
Abstract
This report describes the formulation of a numerical procedure for simulating the turbulent, imcompressible flow over and behind an axisymmetric, self-propelled body. The flow is treated in three parts: (i) over the body, (ii) through the propeller, and (iii) in the very near wake of the body, where axial gradients cannot be ignored. Over most of the body, the flow is easily available from the Reynold's number of the flow and the body shape, but near the body's tail, a special treatment is required. The non-radial components of the mean flow through the propeller are obtained from a computer code based on a classical blade element analysis, while the radial component is obtained analytically in terms of the non-radial components. The effect of the propeller on the aft-body boundary layer turbulence is obtained by integrating the very near wake turbulence model equations across the plane of the propeller. In the very near wake, the flow is computed from the time-averaged Navier-Stokes equations, closed with a second-order model for the turbulence correlations. This system of equations is elliptic, so conditions at all boundaries of the very near wake region are required. In order to choose a sufficiently large solution domain without sacrificing adequate resolution just behind the propeller, the equations are transformed logarithmically.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1978
- Accession Number
- ADA072866
Entities
People
- James J. Riley
- R. E. Robins
- R. L. Gran
- T. Kubota
- W. J. Grabowski