OS-E: 0610 Manifold: Nonlinear Transient Heat Transfer
Nonlinear transient heat transfer analysis of a manifold is done using OptiStruct. The thermal conductivity of the material is a function of temperature.

Figure 1. FE Model with Loadcases and Loadstep
Model Files
Model Description
Consists of a manifold, on which the inlet is maintained at 355°C and the outlet at 122°C. The inside of the manifold is maintained at a temperature of 816°C. Temperature dependent material properties are defined using TABLEM1. Convective heat transfer occurs through the inside surface of the manifold. Here you run Nonlinear heat transfer analysis.
- Manifold
- First order Solid elements
- Property
- Value
- Thermal Conductivity
- 0.045 W/mmK
- Poisson's Ratio
- 0.3
- Density
- 7.9 x 10-9 ton/mm3

Figure 2. Dependency of Thermal Conductivity as a Function of Temperature
Results

Figure 3. Variation of Grid Temperature at Time 0.05 Seconds

Figure 4. Variation of Grid Temperature at Time 1 Second