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Summary The paper describes the contents, the method of teaching and the method of examining of an undergraduate course in computer simulations of fluids. The course and the teaching methods differ radically from the more traditional courses in fluids. Techniques that have resulted in improved efficiency in computer utilization are described and some requirements are enumerated which have been found to be necessary for the successful running of the course.

In many chemical operations for which large scale reactors must be designed, the rate of reaction is influenced by the fact that chemical and physical processes may proceed with comparable rates. This leads to considerable difficulty in constructing appropriate models for studying the behavior of reactors. In this paper, a few representative techniques which have been found useful are described, and compared with methods for modeling combustion chambers.

This paper presents the numerical and experimental investigation of a straight core annular diffuser normally used in marine gas turbine combustor. The flow in the annular diffuser has been simulated by solving the equations for conservation of mass and momentum. For turbulence modeling the standard k-ε model is employed and the predicted results have been validated with experiments. A five-hole probe and a single normal hot wire anemometer were used to measure mean and fluctuating components of velocity. The comparison of the experimental and predicted mean velocity values in radial direction, at different axial locations of annular diffuser is presented and discussed. Flow development in the annular diffuser with different strut geometries has been analyzed. The discussion is focused on the distortion of the flow produced by the strut configuration. Keywords: Annular Diffuser, Struts, Recirculation Region  doi:10.3329/jname.v2i2.1871  Journal of Naval Architecture and Marine Engineering 2(2005) 41-52

4 Murman, E. M. and Krupp, J. A., "Solution of the Transonic Potential Equation Using a Mixed Finite Difference System," Lecture Notes in Physics, Vol. 8, Springer-Verlag, Berlin, 1971, pp. 199-206. 5 Krupp, J. A., "The Numerical Calculation of Plane Steady Transonic Flow Past Thin Lifting Airfoils," Ph.D. thesis, June 1971, Univ. of Washington, Seattle, Wash. 6 Murman, E. M. "Analysis of Embedded Shock Waves Calculated by Relaxation Methods." Proceedings of the AIAA Computational Fluid Dynamics Conference, Palm Springs, Calif., July 1973, pp. 27-40. 7 Garabedian, P. G. and Korn, D. G., "Analysis of Transonic Airfoils," Communications of Pure and Applied Mathematics, Vol. XXIV, 1971, pp. 841-851. 8 Murman, E. M., "A Relaxation Method for Calculating Transonic Flows with Detached Bow Shocks," Lecture Notes in Physics, Vol. 19, Springer-Verlag, Berlin, 1973, pp. 201-205. 9 Magnus, R. M., "The Direct Comparison of the Relaxation Method and the Pseudo-Unsteady Finite Difference Method for Calculating Steady Planar Transonic Flow," TN-73-SP03, 1973, General Dynamics, Convair Aerospace Division, San Diego, Calif. 10 Guderly, K. G., The Theory of Transonic Flow, Pergamon Press, New York, 1962. 11 Knechtel, E. D., "Experimental Investigation at Transonic Speeds of Pressure Distributions Over Wedge and Circular-Arc Airfoil Sections and Evaluations of Perforated-Wall Interference," TN D-15, 1959, NASA. 12 Grossman, R. and Moretti, G., "Time Dependent Computation of Transonic Flows," AIAA Paper 70-1322, Houston, Texas, 1970. 13 Krupp, J. A. and Murman, E. M., "Computation of Transonic Flows Past Lifting Airfoils and Slender Bodies," AIAA Journal, Vol. 10, No. 7, July 1972, pp. 880-886.