Strategies for radiation modeling in turbomachinery
This topic provides general guidelines for selecting appropriate radiation modeling strategies in turbomachinery simulations.
This lesson may include hands-on exercises. Review the Discussion section for background information or click the button to proceed to the practical section.
Discussion
The appropriate radiation modeling approach depends on the importance of radiation in the thermal response, geometry complexity, required accuracy, and acceptable solution time.
Use the following recommendations to balance accuracy and computational cost.
| Modeling scenario | Recommendation | Benefits |
|---|---|---|
| Radiation has negligible influence on thermal behavior | Omit radiation or disable the Enable Radiative Thermal Rotational Periodicity option | Omits radiation or disables radiative rotational periodicity |
| Radiation significantly impacts temperature distribution, such as cavities with strong self-viewing surfaces | Select the Enable Radiative Thermal Rotational Periodicity option | Captures correct temperature distribution |
| Sector view-factor sum closely matches that of the full 3D model | Disable the Enable Radiative Thermal Rotational Periodicity option | Improves pre-solve performance with no loss of accuracy |
| Sector view-factor sum deviates from full 3D | Select the Enable Radiative Thermal Rotational Periodicity option | Preserves radiation fidelity |
| Transient analyses with matrix-dominated solve time | Select the Enable Radiative Thermal Rotational Periodicity option | Maintains accuracy without excessive runtime |
| Simple geometry or negligible circumferential gradients | Use 2D axisymmetric modeling | Provides fast iterations with acceptable accuracy |
| Large or complex radiation models | Enable GPU radiation | Significantly reduces solve time |
Hands-on material
To gain experience with the topics discussed here, complete the following:
