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NASTRAN solutions of problems described by simultaneous parabolic differential equationsNASTRAN solution techniques are shown for a numerical analysis of a class of coupled vector flow processes described by simultaneous parabolic differential equations. To define one physical problem type where equations of this form arise, the differential equations describing the coupled transfers of heat and mass in mechanical equilibrium with negligible mass average velocity are presented and discussed. Also shown are the equations describing seepage when both electrokinetic and hydrodynamic forces occur. Based on a variational statement of the general problem type, the concepts of scalar transfer elements and parallel element systems are introduced. It is shown that adoptation of these concepts allows the direct use of NASTRAN's existing Laplace type elements for uncoupled flow (the heat transfer elements) for treating multicomponent coupled transfer. Sample problems are included which demonstrate the application of these techniques for both steady-state and transient problems.
Document ID
19750023417
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mason, J. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Walston, W. H., Jr.
(Md. Univ.)
Date Acquired
August 8, 2013
Publication Date
September 1, 1975
Publication Information
Publication: NASTRAN: Users' Experiences
Subject Category
Structural Mechanics
Accession Number
75N31490
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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