Accession Number:

ADA191466

Title:

XYFREZ.4 User's Manual.

Descriptive Note:

Special rept.,

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s):

• O'Neil, Kevin

Report Date:

1987-12-01

Pagination or Media Count:

59.0

Abstract:

Using the program XYFREZ, version 4, one may simulate two-dimensional conduction of heat, with or without phase change. The mathematical method employed uses finite elements in space and finite differences in time, and includes latent heat effects through a singularity in the heat capacity. The user need have no real familiarity with either the underlying equations or the numerical procedures. He must only specify material properties, geometrical features, initial and boundary conditions, and information on the desired manner and duration of simulation through time. Heterogeneous material properties may be specified. Boundary conditions currently implemented allow one to specify 1 temperature values which vary arbitrarily in space and time, 2 convective conditions, via a heat transfer coefficient and an ambient temperature, and 3 a no-flux or symmetry condition. The program outputs computed temperature values at numerical mesh points, as well as information for later plotting. From the latter one may see the mesh configuration as well as the phase change isotherm location on it over time. Keywords FreezeThaw Heat conductor.

Descriptors:

• *PROGRAMMING MANUALS
• *THERMAL CONDUCTIVITY
• *COMPUTERIZED SIMULATION
• BOUNDARIES
• CONDUCTIVITY
• CONVECTION
• EQUATIONS
• FINITE ELEMENT ANALYSIS
• HEAT TRANSFER COEFFICIENTS
• HETEROGENEITY
• ISOTHERMS
• LATENT HEAT
• MESH
• NUMERICAL METHODS AND PROCEDURES
• PHASE TRANSFORMATIONS
• PLOTTING
• SPECIFIC HEAT
• SYMMETRY
• TEMPERATURE
• ARMY CORPS OF ENGINEERS

Subject Categories:

• Computer Programming and Software
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE