Introduction
The Patran MSC Nastran Heat Transfer Preference supports the full range of thermal analysis capabilities
available within MSC Nastran. These capabilities include:
? conduction in one, two, and three dimensions
? fundamental convection
? one dimensional advection
? radiant exchange with space
? radiant exchange in enclosures
? specified temperatures
? surface and volumetric heat loads
? elements of thermal control systems
? contact conduction
MSC Nastran can span the full range of thermal analysis from system-level analysis of global energy
balances to the detailed analysis associated with temperature and thermal stress limit levels. Within the
integrated Patran-MSC Nastran environment, you can simulate linear, nonlinear, steady-state, and
transient thermal behavior. You can apply loads and boundary conditions either on the model’s geometry
or on its finite element entities.MSC Nastran’s sophisticated solution strategy automatically addresses the
existence and extent of nonlinear behavior and adjusts the solution process accordingly.
1.2 Using this Guide
This guide is written for both new and experienced users of Patran and MSC Nastran. It provides:
? practical, “how to” descriptions of thermal modeling, analysis, and results processing and
visualization techniques
? descriptions of the relevant Patran menu forms
? basic engineering concepts and theory associated with MSC Nastran''s thermal solution
capabilities
The Patran on-line help system provides logical and efficient access to all of this material.
The remainder of Overview (Ch. 1), describes heat transfer basics. It discusses the concepts of thermal
material properties, loads and boundary conditions, steady-state and transient analysis, and convergence
criteria.
Getting Started - A Guided Exercise (Ch. 2), is designed to familiarize users quickly with the basic Patran
menu interfaces to thermal modeling, steady-state analysis, and results processing. Before beginning,
please review the Guided Tour at the top of the Patran on-line help system.
Building A Model (Ch. 3), describes Patran''s menu forms for each phase of thermal modeling:
? Meshing the geometric model with finite elements
? Defining material properties
? Specifying element properties
? Applying loads and boundary conditions
Running a Thermal Analysis (Ch. 4), describes how to select steady-state or transient analysis solution
types, define solution and subcase input data, select load cases, and submit the MSC Nastran analysis job.
Results Processing and Visualization (Ch. 5), describes how to retrieve MSC Nastran thermal analysis
results into the Patran database. This chapter also summarizes the options for sorting and graphically
rendering analysis results as contour or XY plots.
Example Problems (Ch. 7), presents more advanced engineering problems covering the following
applications:
? Transient thermal analysis (using the same flat plate model, plate.db, created in Getting
Started - A Guided Exercise (Ch. 2))
? Free convection on a printed circuit board
? Forced air convection on a printed circuit board
? Thermal contact resistance
? Typical avionics flow
? Radiation enclosures
? Axisymmetric flow in a pipe
? Directional heat loads
? Thermal stress analysis from directional heat loads
? Thermal stress analysis of bi-metallic plate
Files (App. A), describes the files created when using the Patran MSC Nastran thermal preference
product.
Error Messages (App. B) describes general error and diagnostic messages.
Supported Commands (App. C) describes the MSC Nastran input data used “behind the scenes,”
including File Management Statements, Executive Control Statements, Case Control Commands, and
Bulk Data Entries.
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