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Aqwa User's Manual ANSYS, Inc. Release 15.0 Southpointe November 2013 275 Technology Drive Canonsburg, PA 15317 ANSYS, Inc. is ansysinfo@ansys.com certified to ISO 9001:2008. http://www.ansys.com (T) 724-746-3304 (F) 724-514-9494 Copyright and Trademark Information © 2013 SAS IP, Inc. All rights reserved. Unauthorized use, distributio
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  Aqwa User's Manual Release 15.0ANSYS, Inc.November 2013Southpointe275 Technology DriveCanonsburg, PA 15317 ANSYS, Inc. iscertified to ISO9001:2008. ansysinfo@ansys.comhttp://www.ansys.com(T) 724-746-3304(F) 724-514-9494  Copyright and Trademark Information © 2013 SAS IP, Inc. All rights reserved. Unauthorized use, distribution or duplication is prohibited.ANSYS, ANSYS Workbench, Ansoft, AUTODYN, EKM, Engineering Knowledge Manager, CFX, FLUENT, HFSS and anyand all ANSYS, Inc. brand, product, service and feature names, logos and slogans are registered trademarks ortrademarks of ANSYS, Inc. or its subsidiaries in the United States or other countries. ICEM CFD is a trademark usedby ANSYS, Inc. under license. CFX is a trademark of Sony Corporation in Japan. All other brand, product, serviceand feature names or trademarks are the property of their respective owners. Disclaimer Notice  THIS ANSYS SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION INCLUDE TRADE SECRETS AND ARE CONFID-ENTIAL AND PROPRIETARY PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS.The software productsand documentation are furnished by ANSYS, Inc., its subsidiaries, or affiliates under a software license agreementthat contains provisions concerning non-disclosure, copying, length and nature of use, compliance with exportinglaws, warranties, disclaimers, limitations of liability, and remedies, and other provisions.The software productsand documentation may be used, disclosed, transferred, or copied only in accordance with the terms and conditionsof that software license agreement.ANSYS, Inc. is certified to ISO 9001:2008. U.S. Government Rights For U.S. Government users, except as specifically granted by the ANSYS, Inc. software license agreement, the use,duplication, or disclosure by the United States Government is subject to restrictions stated in the ANSYS, Inc.software license agreement and FAR 12.212 (for non-DOD licenses). Third-Party Software See the legal information in the product help files for the complete Legal Notice for ANSYS proprietary softwareand third-party software. If you are unable to access the Legal Notice, please contact ANSYS, Inc.Published in the U.S.A.  Table of Contents 1. Introduction:What is Aqwa? ...................................................................................................................1 2. Approach .................................................................................................................................................32.1. Import or Create Hydrodynamic Analysis Systems.............................................................................32.1.1. Import a Hydrodynamic System Database................................................................................32.1.2. Create a Hydrodynamic Analysis System...................................................................................32.2. Attach Geometry..............................................................................................................................42.2.1. General Modeling Requirements..............................................................................................52.2.2. Configuring the Geometry.......................................................................................................62.2.3. Add Fixed Points......................................................................................................................72.3. Define Parts Behavior........................................................................................................................72.3.1. Surface Body..........................................................................................................................102.3.2. Line Body...............................................................................................................................112.3.3. Point Mass.............................................................................................................................122.3.4. Point Buoyancy......................................................................................................................122.3.5. Disc.......................................................................................................................................122.3.6. Additional Hydrodynamic Stiffness.........................................................................................132.3.7. Additional Damping (Frequency Independent).......................................................................142.3.8. Additional Added Mass (Frequency Independent)...................................................................142.3.9. Current Force Coefficients......................................................................................................142.3.10.Wind Force Coefficients........................................................................................................172.3.11. Structure Connection Points.................................................................................................192.4. Define Connections........................................................................................................................192.4.1. Cables....................................................................................................................................192.4.1.1. Linear Elastic.................................................................................................................212.4.1.2. Non-Linear Polynomial..................................................................................................212.4.1.3. Non-Linear Steel Wire....................................................................................................212.4.1.4. Non-Linear Catenary......................................................................................................222.4.2. Catenary Data........................................................................................................................232.4.2.1. Catenary Section...........................................................................................................242.4.2.2. Catenary Joint...............................................................................................................252.4.3. Connection Stiffness..............................................................................................................252.4.4. Fenders..................................................................................................................................262.4.4.1. Examples of Use of Fenders............................................................................................282.4.5. Joints.....................................................................................................................................302.4.5.1. Initial Positioning of Jointed Structures..........................................................................332.4.5.2. Moving Structures.........................................................................................................342.4.5.3. Closed Loops.................................................................................................................342.4.5.4. Removing a Joint...........................................................................................................362.5. Mesh..............................................................................................................................................372.5.1. Basic Global Mesh Options.....................................................................................................372.5.2. Advanced Global Mesh Options..............................................................................................382.5.2.1. Mesh Parameters...........................................................................................................382.5.2.2. Sizing............................................................................................................................382.5.2.3. Inflation........................................................................................................................382.5.2.4. Defeaturing...................................................................................................................392.5.2.5. Generated Mesh Information.........................................................................................392.5.3. Local Mesh Controls...............................................................................................................392.5.3.1. Sizing Control................................................................................................................392.5.3.2. Pinching Control............................................................................................................392.5.3.3. Inflation Control............................................................................................................39 iii Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationof ANSYS, Inc. and its subsidiaries and affiliates.  2.6. Establish Analysis Settings..............................................................................................................392.6.1.Time Response Options..........................................................................................................402.6.2. Output File Options................................................................................................................402.6.3. QTF Options...........................................................................................................................432.6.4. Common Analysis Options.....................................................................................................432.7. Applying Ocean Environment and Forces........................................................................................462.7.1. Structure Selection.................................................................................................................462.7.2. Gravity...................................................................................................................................472.7.3.Wave Directions.....................................................................................................................472.7.4.Wave Frequencies..................................................................................................................472.7.5. Structure Force......................................................................................................................482.7.6. Regular Wave.........................................................................................................................492.7.7. Irregular Wave........................................................................................................................502.7.7.1. JONSWAP (H s  or Alpha)..................................................................................................522.7.7.2. Pierson-Moskowitz........................................................................................................522.7.7.3. Gaussian.......................................................................................................................522.7.7.4. User Spectra (1D)...........................................................................................................532.7.7.5. User Time History..........................................................................................................532.7.8. Irregular Wave Group.............................................................................................................562.7.9. Current..................................................................................................................................562.7.10.Wind....................................................................................................................................582.7.10.1. Ochi and Shin Spectrum..............................................................................................602.7.10.2. API Standard Spectrum................................................................................................602.7.10.3. NPD Standard Spectrum..............................................................................................622.7.10.4. ISO Standard Spectrum................................................................................................632.7.10.5. User Defined Spectrum................................................................................................632.7.10.6.Time Dependent Velocity.............................................................................................662.7.11. Cable Winch.........................................................................................................................672.7.11.1.Winch that Maintains Constant Tension........................................................................672.7.11.2.Winch that Changes Cable Length................................................................................682.7.12. Cable Failure........................................................................................................................692.8. Solution..........................................................................................................................................692.8.1. Hydrostatic Results.................................................................................................................702.8.2. Hydrodynamic Graphical Results............................................................................................712.8.2.1. Hydrodynamic Diffraction Results..................................................................................742.8.2.1.1. Diffraction, Froude-Krylov, Diffraction + Froude-Krylov, Linearized Morison Drag,and Total Exciting Force Including Morison Drag.................................................................742.8.2.1.2. Response Amplitude Operators (RAOs) and RAOs with Linearized Morison Drag...........................................................................................................................................752.8.2.1.3. Radiation Damping & Added Mass........................................................................762.8.2.1.4. Steady Drift..........................................................................................................772.8.2.1.5. Sum QTF and Difference QTF.................................................................................772.8.2.1.6. Splitting Forces.....................................................................................................782.8.2.1.7. Bending Moment and Shear Force.........................................................................792.8.2.2. Hydrodynamic Time Response Results...........................................................................812.8.2.2.1. Structure Position.................................................................................................812.8.2.2.2. Structure Velocity..................................................................................................822.8.2.2.3. Structure Acceleration..........................................................................................822.8.2.2.4. Structure Forces....................................................................................................832.8.2.2.5. Fender Forces.......................................................................................................852.8.2.2.6. Joint Forces..........................................................................................................852.8.2.2.7. Cable Forces.........................................................................................................85 Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationof ANSYS, Inc. and its subsidiaries and affiliates. iv User Manual
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