ANSYS AQWA - HYDRODYNAMIC DIFFRACTION

SOFTWARE OVERVIEW

LABORATORY OF OPERATIONAL RESEARCH AND DESIGN

ITS – SURABAYA

NOVEMBER 18, 2011

Supported by HIMATEKLA ITS Surabaya

SUBJECT RELATED

• HYDRODINAMIC

• FLOATING STRUCTURE MANUVERING

• THEORY OF FLOATING STRUCTURE I & II

• FINITE ELEMENT METHOD

• DESIGN OF OFFSHORE STRUCTURE

WHAT?

• ANSYS HYDRODYNAMIC DIFFRACTION (AQWA) is used for

generating the fundamental hydrodynamic parameters

required for undertaking complex motions and response

simulations using three dimensional wave radiation and

diffraction analysisdiffraction analysis

HYDROSTATIC

HYDRODYNAMIC

PRESSURE

MOTIONS (6DOF)

HOW?

MODEL ANSYS DESIGN MODELER

MAXSURF

AUTO CAD

INPUTVCG

RADIUS OF GYRATION

WAVE

MESH

RESULT HYDROSTATICStructure

Hydrostatic Stiffness

Centre of Gravity Position: X: Y: Z:

Z RX RY

Heave(Z):

Roll(RX):

Pitch(RZ):

Hydrostatic Displacement Properties

Actual Volumetric Displacement:

Equivalent Volumetric Displacement:

BargeHull

AQWA Hydrostatic Results

Barg

42.661087 m 1.0559e-3 m 1.6299999 m

18806488 N -295.53528 N 870.57214 N

-16932.924 N 14895992 N -9926.7363 N

49880.109 N -9926.7363 N 1.59532e8 N

3025.8057 m

3025.8057 m

Centre of Buoyancy Position: X: Y: Z:

Out of Balance Forces/Weight: FX: FY: FZ:

Out of Balance Moments/Weight: MX: MY: MZ:

Cut Water Plane Properties

Cut Water Plane Area:

Centre of Floatation: X: Y:

Principal 2nd Moment of Area: X: Y:

Angle Principal Axis makes with X(FRA):

Small Angle Stability Parameters

C.O.G. to C.O.B.(BG):

Metacentric Heights (GMX/GMY):

COB to Metacentre (BMX/BMY):

Restoring Moments/Degree Rotations (MX/MY):

42.66111 m 1.0568e-3 m -0.8640771 m

5.137e-10 1.0628e-8 -3.2879e-7

8.0399e-7 m -2.2921e-5 m 2.331e-8 m

1870.9541 m

42.658436 m 1.5552e-4 m

92454.383 m 916887.88 m

-0.225289 °

2.494077 m

28.061216 m 300.52866 m

30.555294 m 303.02274 m

259984.11 N 2784365. N

RESULT HYDRODYNAMIC

DIFFRACTION + FROUDE-KRYLOV

FROUDE - KRYLOV

DIFFRACTIONDIFFRACTION

RADIATION DAMPING

RAO (RESPON AMPLITUDE OPERATION)

ADDED MASS

STEADY DRIFT

RESULT PRESSURE & MOTION

RESULT PRESSURE & MOTION

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