# Thermal Analysis

The Thermal Analysis section provides an overview of the following analyses.

The Thermal Analysis section provides an overview of the following analyses.

**Heat Transfer Analysis**

Heat transfer describes the physical phenomena of the flow of thermal energy from regions of high temperature to a region of lower temperature, until thermal equilibrium is reached.**Linear Steady-State Heat Transfer Analysis**

Heat transfer analysis solves for unknown temperatures and fluxes under thermal loading.**Linear Transient Heat Transfer Analysis**

Calculates the temperature distribution in a system with respect to time.**Nonlinear Transient Heat Transfer Analysis**

Calculates the temperature distribution in a system with respect to time.**Nonlinear Steady-State Heat Transfer Analysis**

Calculates the temperature distribution in a system, in which material properties are a function of temperature.**One Step Transient Thermal Stress Analysis**

Temperature history is available after a Linear Transient Heat Transfer Analysis or Nonlinear Transfer Heat Transfer Analysis. One Step Transient Thermal Stress Analysis (OSTTS) is used to apply this temperature history (at multiple output time steps) to a Structural Analysis.**Contact-based Thermal Analysis**

In OptiStruct, structural models involving contact are solved by using Small Displacement Nonlinear Analysis.**User-Defined Heat Transfer Properties**

**Darcy Flow Analysis and Convection Topology Optimization**

Forced Convection for Linear Steady-State Heat Transfer is available via Darcy Flow analysis.