Technical note on numerical calculation of diffraction forces, added mass and hydrodynamic damping (TN-FOU-101830-1)

This document presents work carried out to present further validation to AquaSim users concerning the numerical sink-source algorithm used in AquaSim for calculation of hydrodynamic quantities. This document also describes some minor modifications in the analysis and result files.

On the analysis of moored large mass floating objects and how to carry out such analysis in AquaSim (TR-FOU-2174-1)

Several analyses have been carried out validating the ability of AquaSim to calculate response of large mass moored vessels. The hydrodynamic loads to the vessel is calculated integrated with motion and forces in the mooring system such that nonlinear response is accounted for. This document shows how forces from hydrodynamic loads are introduced to AquaSim. The document describes the options AquaSim users have to account for the load components which are of importance for response.

Shock loads from masses connetcted to ropes in AquaSim (TR-FOU-2328-7)

This report summarizes verification study of snap loads in AquaSim. Numerical calculations have been compared toanalytical formulae.

Simulation of large volume floaters (TR-FOU-2338-6)

This report investigates response of soft moored large mass objects typically relevant for feeding barges or closed compartments in the aquaculture industry.

Current reduction in AquaSim (TR-FOU-2500-1)

This document describes how AquaSim calculates reduction of current on succeeding membrane panels for membrane type ‘Normal’ and ‘Normal with bending stiffness’

Nets with bending restistance AquaSim (TR-FOU-2222-5)

This document presents the possibility to analyze nets including the bending stiffness of the nets in AquaSim.

Water entry and exit (TR-FOU-1984-3)

This document describes how water entry and exit is handled in AquaSim in the case where user specifies this to be included in the analysis.

AquaSim, Irregular wave calculation and validation (TR-FOU-2161-1)

This report describes the parameters in AquaSim applied to generate irregular waves and its theory.

Shell elements in AquaSim, case studies for validation (TR-FOU-2328-2)

Analysis has been carried out for 2 cases where response from shell elements is compared to analytic formulae or beam elements. It is shown how additional response effects are covered by shell elements, and the effect of shear locking of shell elements is shown and discussed.

Morison Free Plate – Load formulation in AquaSim (TR-FOU-2328-8)

This report summarizes verification study of the load formulation ‘Morison free plate’. Numerical calculations have been compared to analytical formulae.

Spectral wind loads in AquaSim (TR-FOU-2328-4)

This document describes how wind loads are implemented to AquaSim including spectral wind loading.

Loads on impermeable nets and large volume objects in AquaSim (TR-FOU-2328-5)

This document describes how hydrostatic- and hydrodynamic forces are calculated in AquaSim for the load formulation General impermeable nets, including Lice skirt, Closed compartment, and Surface tarpaulin.

Sloshing in closed tanks (TR-FOU-2328-3)

This report is the summary of testing of internal sloshing wave in a closed tanks/ containments. The internal wave is generated according to theory explained in chapter 2.

Verification and benchmarking of AquaSim (TR-20000-1755-1)

With support from the Norwegian Research Council, the simulation and analysis software tool AquaSim has been developed over a 20-year period. The report outlines several benchmarking tests to verify the accuracy and capabilities of the software tool.

Cresting Wave Factor (TR-FOU-2328-9)

With support from the Norwegian Research Council, the simulation and analysis software tool AquaSim has been developed over a 20-year period. The report outlines several benchmarking tests to verify the accuracy and capabilities of the software tool.

Wave amplitude- and current reduction (TR-FOU-2328-10)

This report summarizes implementation and validation of the feature Wave amplitude reduction and Current reduction on beam elements with the load formulation Hydrodynamic. Numerical analysis has been compared to analytical calculations.

Hexagon net in AquaSim (TR-FOU-100004-1)

In this document, theoretical formulation of solidity, drag coefficient and drag force from current on hexagonal shaped masks is outlined.Further, cases for validation of these parameters are presented. The results show good correspondence between analytical formulation and AquaSim results.

Cross sectional properties beam (Wizard) (TR-FOU-100004-2)

This document presents how AquaEdit calculates cross sectional properties of beams generated from the Wizard. The properties are validated against analytical solution. Results show good correspondence.

Surface tarpaulin – Load formulation in AquaSim (TR-FOU-100004-4)

The Surface tarpaulin load formulation has been implemented to AquaSim for analysis of hydrodynamic forces on horizontal textiles situated at the water surface. The approach combines linear wave theory with a finite-element presentation of the tarpaulin. Hydrodynamic forces due to current and waves are included.

Calculation of loads on turbine blades using BEM theory (TR-FOU-100004-5)

This document follows Aerodynamics of Wind Turbines by Martin O.L. Hansen (Hansen, 2008). Lift elements have been used in AquaSim for a long time. Such elements are based on calculating drag and lift to beam elements by the cross-flow principle. That is consistent with (Hansen, 2008) ch. 2. Then, corrections according to Chapter 4 to obtain the BEM theory is presented.

Regular net - Load formulation in AquaSim (TR-FOU-100004-6)

This document describes the theoretical basis and validation of the membrane load formulation Regular net in AquaSim. This load formulation is based on the cross-flow principle, where the fluid velocity relative to the membrane panel is decomposed into a normal- and tangential component.

Lice skirt and Closed compartment - Impermable properties in AquaSim. (TR-FOU-100004-7)

This document presents three new parameters for impermeable load formulations “Lice skirt” and “Closed compartment”, as well as the removal of the parameters “Bottom factor” and “Vacuum surface suction” previously used for the load formulation “General impermeable net”.

Stokes (regular waves) - Theoretical formulation in AquaSim (TN-FOU-101830-2)

This technical note presents the theoretical formulation and implementation of Stokes (regular) waves in AquaSim. The document focuses on the fifth-order Stokes wave theory, which provides a representation of nonlinear, periodic surface gravity waves for waves of moderate to high steepness.

Added mass, hydrodynamic damping and convolution integral in AquaSim (TN-FOU-101830-4)

The option to account for convolution-based hydrodynamic forces on Beam and Membrane components has been introduced to AquaSim. This implementation allows for including memory-effects that arise from frequency-dependent added mass and damping in time-domain simulations.

Combination of waves and current in AquaSim (TN-FOU-101830-5)

The option to account for convolution-based hydrodynamic forces on Beam and Membrane components has been introduced to AquaSim. This implementation allows for including memory-effects that arise from frequency-dependent added mass and damping in time-domain simulations.

Surface tarpaulin - Impermeable properties in AquaSim (TN-FOU-101830-6)

This document presents the hydrodynamic parameters and modelling assumptions for the Surface Tarpaulin load formulation in AquaSim. It explains how impermeable membrane panels at the water surface interact with waves and current. This document aims to clarify how key coefficients affect drag -, suction-, added mass- and damping forces.