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Boundary Conditions for Jet Flow Computations

Author
Hayder, M. E.
Published
Jun 1, 1994.
Physical Description
1 electronic document
Additional Creators
Turkel, E.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Ongoing activities are focused on capturing the sound source in a supersonic jet through careful large eddy simulation (LES). One issue that is addressed is the effect of the boundary conditions, both inflow and outflow, on the predicted flow fluctuations, which represent the sound source. In this study, we examine the accuracy of several boundary conditions to determine their suitability for computations of time-dependent flows. Various boundary conditions are used to compute the flow field of a laminar axisymmetric jet excited at the inflow by a disturbance given by the corresponding eigenfunction of the linearized stability equations. We solve the full time dependent Navier-Stokes equations by a high order numerical scheme. For very small excitations, the computed growth of the modes closely corresponds to that predicted by the linear theory. We then vary the excitation level to see the effect of the boundary conditions in the nonlinear flow regime.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19940031469.
Accession ID: 94N35976.
NASA-TM-106648.
ICOMP-94-12.
NAS 1.15:106648.
E-8956.
AIAA PAPER 94-2195.
Fluid Dynamics Conference; 20-23 Jun. 1994; Colorado Springs, CO; United States.
Terms of Use and Reproduction
Copyright, Distribution as joint owner in the copyright.
View MARC record | catkey: 15657798