|August 24, 2015, 13:53||
Join Date: Aug 2015
Posts: 3Rep Power: 2
Good evening, help please. I am doing flow around the blade. With increasing rev/min^-1, torque_z()@blade becomes negative.
What is my fault?
Tried to swap the axis -- no results
When rev/min^-1, = 91 (λ = 4) -- all is well
with rev/min^-1, = 137 (λ = 5) torque_z becomes negative
|August 24, 2015, 18:16||
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,931Rep Power: 85
Have a think about what this means. If the torque is negative then the rotor will slow down. This means you have exceeded the speed of the rotor.
That assumes your simulation is accurate. Your simulation could also be inaccurate - that is an FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
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