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Airfoil is not pitching as expected

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Old   December 3, 2018, 04:03
Default Airfoil is not pitching as expected
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Aldo Bonfiglioli
Join Date: Jan 2013
Location: Potenza, Italy
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I'ma trying to run a pitching airfoil using the pre-compiled Windows exe, version 6.0.0.
In contrast to my expectation, the pitching motion is one sided, i.e. only negative AoA.
The animation can be viewed here:
https://www.dropbox.com/s/6859ilntub...tled2.avi?dl=0
and the config file is listed below.
Code:
%
% Dynamic mesh simulation (NO, YES)
GRID_MOVEMENT= YES
%
% Type of dynamic mesh (NONE, RIGID_MOTION, DEFORMING, ROTATING_FRAME,
%                       MOVING_WALL, STEADY_TRANSLATION, FLUID_STRUCTURE,
%                       AEROELASTIC, ELASTICITY, EXTERNAL,
%                       AEROELASTIC_RIGID_MOTION, GUST)
GRID_MOVEMENT_KIND= RIGID_MOTION
%
% Motion mach number (non-dimensional). Used for initializing a viscous flow
% with the Reynolds number and for computing force coeffs. with dynamic meshes.
MACH_MOTION= 0.3
%
% Moving wall boundary marker(s) (NONE = no marker, ignored for RIGID_MOTION)
MARKER_MOVING= ( airfoil )
%
% Coordinates of the motion origin
MOTION_ORIGIN_X= 0.33
MOTION_ORIGIN_Y= 0.0
MOTION_ORIGIN_Z= 0.0
%
% Angular velocity vector (rad/s) about the motion origin
ROTATION_RATE_X = 0.0
ROTATION_RATE_Y = 0.0
ROTATION_RATE_Z = 0.0
%
% Pitching angular freq. (rad/s) about the motion origin
PITCHING_OMEGA_X= 0.0
PITCHING_OMEGA_Y= 0.0
PITCHING_OMEGA_Z= 128.22
%
% Pitching amplitude (degrees) about the motion origin
PITCHING_AMPL_X= 0.0
PITCHING_AMPL_Y= 0.0
PITCHING_AMPL_Z= 15.0
%
% Pitching phase offset (degrees) about the motion origin
PITCHING_PHASE_X= 0.0
PITCHING_PHASE_Y= 0.0
PITCHING_PHASE_Z= 75.0
%
% Translational velocity (m/s or ft/s) in the x, y, & z directions
TRANSLATION_RATE_X = 0.0
TRANSLATION_RATE_Y = 0.0
TRANSLATION_RATE_Z = 0.0
%
% Plunging angular freq. (rad/s) in x, y, & z directions
PLUNGING_OMEGA_X= 0.0
PLUNGING_OMEGA_Y= 0.0
PLUNGING_OMEGA_Z= 0.0
%
% Plunging amplitude (m or ft) in x, y, & z directions
PLUNGING_AMPL_X= 0.0
PLUNGING_AMPL_Y= 0.0
PLUNGING_AMPL_Z= 0.0
%
% Move Motion Origin for marker moving (1 or 0)
MOVE_MOTION_ORIGIN = 1
Am I doing smthg. wrong with the options?
Thanks,
Aldo
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