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Turbomachinery: Negative number of recomputed blade row |
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#1 |
New Member
M
Join Date: Nov 2022
Posts: 4
Rep Power: 4 ![]() |
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. Code:
---------------------- 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 ----------------------------- Code:
MARKER_TURBOMACHINERY= (OUTFLOWPassage, INFLOWPassage) Code:
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) |
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#2 |
New Member
M
Join Date: Nov 2022
Posts: 4
Rep Power: 4 ![]() |
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.
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#3 | |
New Member
Join Date: Jan 2022
Posts: 14
Rep Power: 5 ![]() |
Hi
I have the same issue, but I checked my orientation and it seems to be correct i.e. z-axis is the rotational axis and flow is along the z-axis. Quote:
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#4 |
Member
Josh Kelly
Join Date: Dec 2018
Posts: 57
Rep Power: 8 ![]() |
Can you attach the full preprocessing output and cfg file? Are your periodics matching correctly? Do you get any warning messages? The flow in turbomachinery simulations must follow the positive z-direction (i.e. inflow at min z, outflow at max)
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