[Vafi]

Hi there,

I'm trying to run a turbomachinery case where I modified the APU testcase. The goal is to run a multizone compressor sim, but every time I try to run the case the recomputed blade row becomes negative.

---------------------- Turbomachinery Preprocessing ---------------------

Initialize Turbo Vertex Structure.
Number of span-wise sections in Zone 0: 44.
TURBOMACHINERY folder creation failed.
Max number of span-wise sections among all zones: 44.
Initialize solver containers for average and performance quantities.
Compute inflow and outflow average geometric quantities.
Transfer average geometric quantities to zone 0.
Inlet area for Row 1: 9.03405e+06 cm^2.
Oulet area for Row 1: 7.07688e+06 cm^2.
Recomputed number of blades for Row 1: -8.96066.
Initialize turbomachinery solution quantities.
Initialize inflow and outflow average solution quantities.
Inlet flow angle for Row 1: 0°.
Outlet flow angle for Row 1: -nan°.

------------------------------ Begin Solver -----------------------------

I imported the mesh using CGNS converting it to .su2 using SU2_DEF. When looking at the mesh it does not look like there is anything wrong. If I switch the turbomachinery marker, e.g :

MARKER_TURBOMACHINERY= (OUTFLOWPassage, INFLOWPassage)

The blade number becomes positive, but this is rather counterintuitive and the sim still diverges. Is anybody able to help me with this? These are my markers and turbo settings. I converted the testcase to a single zone case for clarity, so it just involves the impeller now.

TURBOMACHINERY_KIND= AXIAL_CENTRIFUGAL

MARKER_HEATFLUX= (HUB, 0.0, SHROUD, 0.0, BLADE, 0.0)
MARKER_TURBOMACHINERY= (INFLOWPassage, OUTFLOWPassage)
MARKER_INTERNAL= (SHROUDTIPGGISIDE1, SHROUDTIPGGISIDE2, BLDLOW, BLDGEOLOW, BLDHIGH, BLDGEOHIGH)
MARKER_GILES= (INFLOWPassage, TOTAL_CONDITIONS_PT, 101325.0, 288.15, 1.0, 0.0, 0.0, 1.0, 0.0, OUTFLOWPassage, STATIC_PRESSURE_1D, 151213.0, 0.0, 0.0, 0.0, 0.0 , 1.0, 0.0)
MARKER_PERIODIC= (PER1, PER2, 0.0, 0.0, 0.0, 0.0, 0.0, 24.0, 0.0, 0.0, 0.0)

[Vafi]

So it turns out SU2 can be mesh orientation specific, meaning the direction of the outlet vector can have an effect on the code. I managed to solve my problem by rotation the mesh. Previously my outlet vector was pointing in the positive X,Y direction. By rotating the mesh -90deg (around Z axis) the outlet vector pointed in the +X,-Y direction, which fixed my problem. The rotation axis of my mesh is the Z-axis, with the flow entering the impeller channel following the +Z direction.