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Archimedes screw turbine - non-physical results

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Old   June 2, 2022, 20:35
Default Archimedes screw turbine - non-physical results
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Alberto marasi
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Hi guys,
My master's thesis project consists in simulating an Archimedes screw turbine using ansys fluent CFD.
I imported the geometry from SOLIDWORKS, generated a good quality mesh, and set the fluent.
However, the torque generated by the simulation is excessively high, generating non-physical results (power generated by the turbine greater than the hydraulic one). What could be the problem?

I used the following settings:
Transient simulation
VOF implicit formulation (water + air)
K-w SST model
Mesh motion to simulate machine rotation (known rps)
Mass flow inlet (to set the inlet flow) Pressure outlet (to adjust the outlet flow) Second order upwind everywhere
Under relaxation factor 0.1
Flow courant number 50
Time step 0.005 sec.

Thank you
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