Learning Forum

[Jansys]

I'm trying to validate an experimental study by trying to obtain the same torque.

the dimensions of the blades were given, so I modeled and ran simulations on CFD fluent

TSR: 0.555

wind speed: 7 m/s

Used this formula to calculate rpm : rpm = 60 * V * TSR / ( Pi * D )

[Rob]

Assuming the blade shape is also defined I'd expect to get a similar result with a good mesh. With a poor mesh I'd expect to be closer than you're seeing above.

[Jansys]

The blade shapes are halve cylinders, here are my mesh settings as well. I'm not sure what would be considered as good mesh?
Here is a link to the study I am trying to validate for as required by our thesis defense panel:
https://reader.elsevier.com/reader/sd/pii/S1876610215005652?token=06F41B08CDE2292E2B4025CCE91C6A45B3144166B70DFF7FEEEAFA81455DDF1EEB8398AF983295C66EB2F957E4E90A2B&originRegion=us-east-1&originCreation=20220124144208
Results after increasing domain size at 5 m/s: I was able to reach torque of around .06 still far from .03 as per graph above

[Jansys]

I did face sizing for the blades .005m

[Rob]

Please show a slice through the mesh on a z-plane and zoom in on the rotor. How many cell zones have you got?

[Jansys]

20842346 elements, element size at .04 for fluid and .004 for the blades

[Rob]

z-plane please - ie across the turbine unit. Contours of velocity will be useful too.

[Jansys]

Here are my recent results I was able to get .053 tq but I had reduced blade diameter by 20mm, our defense panel wants a validation with 5-10% error

[Jansys]

[DrAmine]

How are you calculating the torque in Fluent?

[Jansys]

By using the report definitions for moment at the blades, is that correct?

[Rob]

Yes, what did you define as the axis?

[Jansys]

I used the z axis