NX Space Thermal
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NX Space Thermal for Advanced Simulation environment is an industry-specific vertical application for thermal analysis of space systems.

Aplicaciones de NX Space Thermal

 Specific capabilities for the Space industry

• Orbital models for all planets of our solar system at any specific point in time and attitude
• Powerful and fast view factor calculations (including parallel computing for large space thermal models)
• Powerful and smart view factor transient re-calculations for the case of articulation simulations, such as for solar panel joints rotation allowing constant pointing at the sun or antenna pointing to specific location
• Efficient transient solution for thermal shock transient analyses during eclipse
• Multi-layer shells specific formulation for MLI and TPS applications
• Interfaces to: 
  - SINDA
  - TSS 
  - TRASYS
  - ESTAN
  - ESARAD 
  - Thermica

 NX Space Systems Thermal solver capabilities

• Steady-state (linear and nonlinear)
• Large selection of 1D/2D/3D linear and parabolic finite element types supported
• Material nonlinear thermal properties
• Multi-layer shells for MLI and TPS applications
• Axi-symmetric modeling
• Cyclic thermal problems
• Iterative conjugate gradient solver technology
• Fully coupled conduction, radiation and convection heat transfer simulation
• 1D duct and hydraulic network elements
• Motion and articulation modeling (translational motion and rotational joints)

 Thermal Coupling technology for modeling thermal contacts within NX assembly

• Thermally connect disjoint and dissimilar mesh faces and edges 
• Surface-to-surface, edge-to-edge or edge-to-surface contact modeling between parts: constant, time or temperature-dependent coefficient of heat transfer, resistance or conductance
• Radiative exchange between disjoint part faces, and faces within a single part
• Interface modeling between connected parts: constant, time or temperature-dependent coefficient of heat transfer, resistance or conductance
• Convective exchange correlations between faces: parallel plates, concentric spheres or cylinders
• Join
• One Way heat transfer
• User defined
• Connection break, Series or T-junction

 Optical, material and surface properties

• Electrical resistivity
• Phase change and ablation properties
• Extinction coefficient
• Refraction
• Bi-variate tables
• Transmissivity/specularity
• Angle-dependent optical properties

 Applied heat loads

• Constant and time-dependent: 
  - Heat loads
  - Heat flux
  - Heat generation
• All applied loads can be controlled with temperature-controlled thermostat conditions or PID controllers
• Radiative heating
• Peltier coolers modeling
• Electrical joule heating

 Temperature boundary conditions

• Constant temperature for steady-state or transient
• Time varying for transient and for nonlinear steady-state
• Thermostat temperature controls or PID controllers

 Conduction heat transfer

• Handles large conduction models (memory efficient data scheme)
• Temperature-dependent conductivity, specific heat
• Orthotropic conductivity
• Heat of formation at phase change temperature

 Convection heat transfer

• Constant, time and temperature-dependent heat transfer coefficients
• Parameter and nonlinear temperature gradient functions

 Free convection

• Correlation-based free convection to ambient for inclined plates, cylinders and spheres

 Forced convection

• Correlation-based convection for plates, spheres and cylinders in forced fluid flow

 Radiation heat transfer

• Constant and temperature-dependent emissivity
• Multiple radiation enclosures
• Diffuse view (form) factor calculations with shadowing
• Net view (form) factor calculations
• Adaptive scheme for view (form) factor sum optimization
• Hemicube-based view (form) factors calculation using graphics card hardware
• Radiation patch generation to condense large element-based radiation models
• Radiation matrix controls and parameters
• Additional radiation request types:
  - Among group
  - Group-to-group
  - Monte Carlo calculation method
  - Enhanced radiation with Ray Tracing

 Initial conditions

• Starting temperatures for both steady-state and transient
• Starting temperatures from previous solution results, from file

 Solver solution attributes

• Restart conditions
• Cyclic convergence criteria
• Direct access to solver parameters
• Solver convergence criteria and relaxation factors
• Solver monitor with solution convergence and attributes
• Intermediate results display and recovery directly from solver progress monitor
• Open Architecture (user subroutines)
• Support to include external files

 Other features

• Results Reporter
• Summary of results to MS® Excel worksheets
• Heat flow calculation between groups
• Heat maps
• Complete or partial deactivation of selected elements (for radiation form factors calculations)
• Temperature mapping for Nastran FE models

 Results post-processing

• Temperatures
• Temperature gradient
• Total load and flux
• Conductive flux
• Convective flux
• Convection coefficients
• Residual
• Heat map
• View factor sum

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