SST RANS Perturbations

Responses can be calculated for any of 5 pre-selected perturbations to the RANS SST model. All responses (aero or otherwise) will be affected by these perturbations due to the coupling between the aero, thermal, and structural analyses. As a result, a user can specify any response associated with a given perturbation by appending the type of perturbation to the standard output function name. The following perturbation suffixes for individual perturbations are supported: _SSTC1, _SSTC2, _SSTC3, _SSTP1C1, and _SSTP1C2. In addition the _SSTMAX, _SSTMED, and _SSTMIN suffixes are also supported and return the maximum, median, or minimum value of the specified QoI over all the RANS perturbations, respectively.

For example, specifying the following output functions in the config file will run 6 different RANS analyses (one non-perturbed analysis, and 5 perturbed analyses). The mass and the value of the thrust with no perturbations, and the max and min value of thrust over all 5 perturbations is also returned.

OUTPUT_FUNCTIONS= (MASS, THRUST, THRUST_SSTMAX, THRUST_SSTMIN)

Note that the _SSTXXX suffixes can be used for thermal and structural QoI as well since these analyses are coupled to the aero analysis. For example THERMAL_LAYER_PN_FAILURE_CRITERIA_SSTMAX returns the maximum agglomerated failure criteria (via the modified P-norm) for the thermal layer over all 5 RANS perturbations.

Perturbation tags can only be used when a 2D axisymmetric or 3D non-axisymmetric RANS analysis is used.