Steady-State Heat Transfer

Solution 153 (NLSCSH)
This solution is included with NX NASTRAN Dynamics
General Capabilities
Solution methods:

  • Steady state, linear and/or nonlinear (SOL 153).
  • Transient, linear and/or nonlinear (SOL 159).

Heat conduction:

  • Temperature-dependent conductivity.
  • Temperature-dependent specific heat.
  • Anisotropic thermal conductivity.
  • Latent heat of phase change.
  • Temperature-dependent internal heat generation.
  • Weighted temperature gradient dependent internal heat generation.
  • Time-dependent internal heat generation.

Free convection boundaries:

  • Temperature-dependent heat transfer coefficient.
  • Weighted temperature gradient dependent heat transfer coefficient.
  • Time-dependent heat transfer coefficient.
  • Nonlinear functional forms.
  • Weighted film temperatures.

Forced convection:

  • Tube fluid flow field relationships – H(Re,Pr).
  • Temperature dependent fluid viscosity, conductivity, and specific heat.
  • Time-dependent mass flow rate.
  • Temperature-dependent mass flow rate.
  • Weighted temperature gradient dependent mass flow rate.

Radiation to space:

  • Temperature-dependent emissivity and absorptivity.
  • Wavelength dependent emissivity and absorptivity.
  • Time-dependent exchange.

Radiation enclosures:

  • Temperature-dependent emissivity.
  • Wavelength-dependent emissivity.
  • Diffuse view factor calculations with self and third-body shadowing.
  • Adaptive view factor calculations.
  • Net view factors.
  • User-supplied exchange factors.
  • Radiation matrix control.
  • Radiation enclosure control.
  • Multiple radiation enclosures.

Applied heat loads:

  • Directional heat flux.
  • Surface normal heat flux.
  • Grid point nodal power.
  • Temperature-dependent heat flux.
  • Weighted temperature gradient dependent heat flux.
  • Time-dependent heat flux.

Temperature boundary conditions:

  • Specified constant temperatures for steady state and transient.
  • Specified time-varying temperatures for transient.

Initial conditions:

  • Starting temperatures for nonlinear steady state analysis.
  • Starting temperatures for all transient analyses.

Thermal control systems:

  • Local, remote, and time-varying control points for free convection heat transfer
    coefficients.
  • Local, remote, and time-varying control points for forced convection mass flow rates.
  • Local, remote, and time-varying control points for heat flux loads.
  • Local, remote, and time-varying control points for internal heat generation rates.
  • Transient nonlinear loading functions.
  • Perfect conductor algebraic constraint temperature relationships.

Output graphical display – basic:

  • Heat flows for conduction and boundary surface elements.
  • Temperature versus time for grid points.
  • Enthalpy versus time for grid points.
  • Isothermal contour plots.

Miscellaneous:

  • NX Nastran DMAP and DMAP Alter capability.
  • NX Nastran restart capability.
  • Direct matrix input to conduction and heat capacitance matrices.
  • Lumped mass and discrete conductor representations.

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