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Noureddine August 11, 2008 18:11

Pitches value problem
 
Hi all,

I want to excute a transient simaulation of an isolated transonic Rotor 37 using ANSYS CFX 11 with rotation along one pitch, but the value of pitches displayed by the solver doesnt correspond to that i specified.

my setup is as fellow :

- Rotor 37 design speed = 17188.7 rpm = 1800 [rad/s]

- 36 blades ===> 1 pitch = 2*3.1416/36 = 0.1745333 [rad]

- total time to rotate along one pitch = 0.1745333/1800 = 9.7e-5 [s]

- if i choose 100 time steps ===> DT = 9.7e-5/100 = 9.7e-7 [s].

I should see in each time step an increase of pitches by 0.01, but it is not the case !!!!!!

what it can be the problem ????? and I could not get convergence????

any advice is very welcome.

Regards,

Noureddine


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