June 2024 critical fixes

Bug 65782: Area correction for side B is not taken into account by the thermal solver when area correction for side A is not defined (set to none) for two-sided thermal stream loads

The area correction setting for side B was not written to the INPF file when the area correction setting for side A was not defined—set to none—for two-sided thermal stream loads. Before the fix, the workaround was to set the area correction factor to 1 for side A, and then define the desired area correction factor for side B. After the fix, the area correction factor for side B is written to the INPF file even if the side A setting is not defined.

User Story 87734: Code refactorization for correction area in MEREL module

Fixed versions: 2406.1

This is a code refactorization of the way in which the thermal solver computes convective area. This change can produce slightly different results, mainly heat transfer coefficients and convective heat fluxes, for models with boundary conditions applied on an internal line between meshes with similar thicknesses.

Bug 89574: 0D duct fluid element that is common to two or more duct flow total temperature effects BCs is only considered as part of the selection for one of these BCs

Before the fix, a 0D duct fluid element that is common to two or more duct flow total temperature effects boundary conditions was only written to the INPF file as part of the selection for one of those boundary conditions. After the fix, a 0D duct fluid element that is located at the junction of two or more duct flow total temperature effects boundary conditions is now added to the selections for all the boundary conditions. This leads to a change in swirl velocity results, as well as different total absolute temperature and total relative temperature results.

Bug 90312: Negative angular velocity in rotation load is not taken into account for relative temperature calculation when using relative temperature reference frame

Negative rotation loads relative to an axisymmetric global axis or a specified global cyclic analysis axis were incorrectly supported by the thermal solver, leading to no effect on the relative temperature calculation if the angular velocity sign changed. This has been fixed.

Bug 90369: Relative temperature reference frame does not work correctly in conjunction with reverse flows

Thermal stream loads with reverse mass flows defined that use the relative temperature reference frame were incorrectly supported by the thermal solver. The contribution of rothalpy to the thermal stream load had an opposite sign to the correct one. This has been fixed.

Bug 90711: Model with convection coupling and radiation BC's applied on an internal line works with 2306.7 but fails in 2306.8

Between TMG versions 2306.7 and 2306.8, a fix was made for the thermal solver to handle the convective area calculation along an internal line between two elements having different thicknesses, for example between plane stress and plane stress elements, or between plane stress and axisymmetric elements, in a more robust and consistent manner. This original fix only concerned thermal couplings of type Convection Coupling and Duct Node Convection Coupling, and could lead to discrepancies in the setting of any other boundary condition that overlaps the internal line selection where the convection coupling is also applied. This has been fixed. Consequently, the estimated convective heat flux and the solid temperature prediction at the vicinity of the internal line where the convection coupling and another boundary condition overlap may be impacted.