OrcaFlex Manual - Orcina

System Modelling: Data and Results, 6D Buoys
Applied Force, Applied Moment
Applied Lx-Force, Applied Ly-Force, Applied Lz-Force
Applied Lx-Moment, Applied Ly-Moment, Applied Lz-Moment
The sum of all the local and global applied loads, reported in the local buoy axes directions.
Force, Moment
Lx-Force, Ly-Force, Lz-Force, Lx-Moment, Ly-Moment, Lz-Moment,
GX-Force, GY-Force, GZ-Force, GX-Moment, GY-Moment, GZ-Moment
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These results are not available for buoys that are connected to other objects – you can instead use the Connection
Force and Connection Moment results.
These results are the total force and moment applied to the buoy, excluding structural inertia loads and added
inertia loads due to acceleration of the buoy. They include the loads from any objects connected to the buoy, but
again exclude structural inertia and added inertia loads on the connected object. The reported loads therefore
correspond to the left hand side of the equation of motion TotalLoad = VirtualInertia x Acceleration, where
VirtualInertia is the total structural and added inertia of the buoy and any connected objects.
Force and Moment report the magnitudes of the loads. The Lx, Ly and Lz results report the components of the force
and moment in the local buoy axes directions. The GX, GY and GZ results report the components of the force and
moment in the global axes directions. The moments given are about the buoy origin.
Solid Contact Force
Solid Contact Lx-Force, Solid Contact Ly-Force, Solid Contact Lz-Force
The magnitude and components, in local buoy axes directions, of the force due to contact with elastic solids.
Slam Load Results
These results are only available for 6D lumped buoys that have non-zero Slam Area and Slam Coefficient, and for
spar buoys and towed fish that have a non-zero Slam Coefficient.
Slam Force, Slam GX-Force, Slam GY-Force, Slam GZ-Force
Slam Force reports the total instantaneous slamming load experienced as the body enters or exits the water. Slam
Force acts in the direction normal to the water surface. The GX, GY, GZ results give components of the total slam load
in the global axes directions.
Slam GX-Moment, Slam GY-Moment, Slam GZ-Moment
The components in global axes directions of the moment of the slam force about the body reference origin.
Wing Results
If the 6D buoy has wings attached then for each wing the following results are available.
Wing X, Wing Y, Wing Z
The position of the wing origin, relative to global axes.
Wing Azimuth, Declination and Gamma
The orientation angles of the wing, relative to the buoy.
Lift, Drag, Moment
The lift force, drag force and drag moment applied to the wing.
The lift force is applied at 90° to the relative flow direction. Positive values mean a force trying to push the wing
towards its positive side, negative values towards its negative side.
The drag force is applied in the relative flow direction and is always positive.
The drag moment is applied about the line that is in the wing plane and at 90° to the relative flow direction. Positive
values are moments trying to turn the wing to bring the wing y-axis Wy to point along the relative flow direction;
negative values are moments trying to turn the wing the opposite way.
Note: When the wing is less than half submerged, and you have included wind loads on wings, then the
lift force, drag force and moment reported are the air loads. Otherwise they are the water loads.