ANSYS 14 Structural Mechanics Update

2011 ANSYS, Inc. November 22, 2011

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Improving Your Structural Mechanics Simulations with Release 14.0


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Structural Mechanics Themes

MAPDL/WB Integration

Physics coupling

Rotating machines

Composites & Fracture Mechanics

Application Customization

Thin structures modeling

Contact analysis

Performance

Advanced Modeling

Geometry Handling

Listening to your needs, we have been able to identify a number of themes which form the basis of our roadmap and guide our developments


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What will Release 14.0 bring you?


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Lets now take a closer look at some topics


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Finite Element Information Access within ANSYS Mechanical


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ANSYS Workbench is originally a geometry based tool. Many users however also need to control and access the finite element information.

Motivation


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Spot Welds

Connections created internally at the solution level are available and can help understand the results

Reviewing Connections

Weak springs and MPC contacts as generated by the solver


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Nodes can be grouped into named selections based on selection logic, using locations or other characteristics or manual selections

Selections of Nodes

Box Selection Node Picking Lasso Selection


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Applying Loads and Orientations to Nodes

Nodal orientation allows users to orient nodes in an arbitrary coordinate system.

Direct FE loads and boundary conditions can be applied to selections of nodes.

Nodes are oriented in cylindrical system for loads and boundary condition definitions


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Results on Node Selections

Results are displayed on elements for which all nodes are selected.

Nodes named selections allow to scope on specific regions of the mesh or remove undesired areas.

Results with first layer of quads removed

Results on quads layers only


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Restart and Direct FE Loads

Nodal Forces and Pressures objects can be added to a restart analysis without causing the restart points to become invalid.

Other loads can now be modified without losing the restart points.

Analysis Settings tabular data: No restart point is lost

Added after initial solve

Second Load step modified for restart


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Linear Dynamics in ANSYS Mechanical


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Workbench and Mechanical enhancements

MSUP Transient Analysis supported

Joint feature can now be used in Harmonics, Random vibration analysis

Reaction Force & Moment results is now supported

Modal Superposition Transient

Joints in Harmonic Analyses

Reaction Forces in a Harmonic Analyses


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Physics Coupling

Data Mapping


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Motivation

Exchange files are frequently used to transfer quantities from one simulation to another. Efficient mapping of point cloud data is required to account for misalignment, non matching units or scaling issues.


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Supported Data Types

New at R14.0


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Increased Accuracy

The smoothness of the mapped data depends on the density of the point cloud.

Several weighting options are available to accommodate various data quality.

Triangulation versus Kriging


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Validating the Mapped Data

Visual tools have been implemented to control how well the data has been mapped onto the target structure


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Importing Multiple Files

Multiple files can be imported for transient analyses or to handle different data to be mapped on multiple bodies


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Rotating Machines

Studying Rotordynamics in ANSYS Mechanical


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Motivation

ANSYS Mechanical users need to be able to quickly create shaft geometries as well as analyze dynamic characteristics of rotating systems

Industrial fan (Venti Oelde)


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Geometry Creation

Geometries can be imported from a CAD system or imported from a simple text file definition as used in preliminary design


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Import/Export of Bearing Characteristics

ANSYS provides an interface that allows to import bearing characteristics from an external file


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Specific Solver Settings

Rotordynamics analyses require a number of advanced controls:

Damping

Solver choice

Coriolis effect


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Campbell Diagrams

Campbell diagrams are used to identify critical speeds of a rotating shaft for a given range of shaft velocities


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Composites

Enhanced Analysis Workflow and Advanced Failure Models for Composites


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Motivation

Efficient workflows and in-depth analysis tools are required to model and understand complex composites structures


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Defining Material Properties

Composites material require specific definitions including orthotropic properties, as well as some constants for failure criteria (Tsai-Wu, Puck, LaRc03/04, Hashin)


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Manually Defining Layers on Simple Geometries

Users can define simple layered sections for a shell body as well as define thicknesses and angles as parameters


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Defining Layers on Complex Geometries

For complex geometries, the ANSYS Composite PrepPost tool is used and layer definitions are imported in the assembly model in ANSYS Mechanical.

Courtesy of TU Chemnitz and GHOST Bikes GmbH


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Investigating Composites Results

ANSYS Mechanical supports layerwise display of results.

ANSYS Composite PrepPost offers comprehensive capabilities for global and plywise failure analysis.


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Advanced Failure Analysis

Crack growth simulation based on VCCT is available to simulate interfacial delamination.

Progressive damage is suitable for determining the ultimate strength of the composite (last-ply failure analysis)

2D laminar composite

Initial crack

Start of damage (layer 1)

Progressed damage (layer 1)

Progressed damage (layer 3)


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Customization

ANSYS Design Assessment


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Motivation

Many of you have expressed the need for: Computing and displaying specific results Be able to achieve more complex User defined results


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What is Design Assessment?

The Design Assessment system enables the selection and combination of upstream results and the ability to optionally further assess results with customizable scripts


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Expanded Result Access

Filtering of potentially invalid combinations can be suppressed to enable greater user control. This allows the user to access results not typically available in the base analysis.

Modal=No Beam Results

DA + Allow all Available Results allows beam results


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Design Assessment for Advanced User Defined Results

Design Assessment enable users to extend user defined results capabilities with:

Expressions using mathematical operators as supported by Python

Coordinate systems, Units Systems

Integration options

Nodal, Element-Nodal & Elemental result types

Import from external tables Script used to display scalar element data stored

in an external file


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Thin Structures

Mesh Connections


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Motivation

In order to connect meshes of different surface parts so as to merge nodes at intersections, users do not always want or cannot merge the topologies at the geometry level. Mesh based connections are required.


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Mesh Connections

Mesh connections work at part level:

As a post mesh operation

Base part mesh is stored to allow for quick changes in connections


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Modal Analyses Shows Proper Connections of the Various Bodies


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Further Meshing Enhancements


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Virtual Topologies Interactive Editing

Virtual topologies are handled more interactively through direct graphics interaction rather than tree objects.

User selects entities then applies VT operations

Direct access to operations from RMB menu


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VT Hard Vertex, Edge and Face Splits

Hard vertices can be added at any location on an edge or a face.

Hard vertices can then be used to create face splits from virtual edges.


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Virtual Topologies Applications

Get swept mesh on non-sweepable bodies

Improve shell mesh quality and orthogonality with VT combinations


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Contact Analysis

Rigid Body Dynamics


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Motivation

Many mechanisms and assemblies have components that operate through contact. In order to maintain the rapid turnaround for RBD simulations, there has been a subsequent focus on improving speed, accuracy and reliability of the contact capability.


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Performance Improvements

Valve: 158 sec elapsed time (2x speed up)

Piston: 9 sec elapsed time (7.5x speed up)

The applicability, robustness and efficiency of the contact has been improved for speed and accuracy expect a typical 2-5x speed-up

Transition and jump prediction have been greatly improved


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Contact Analysis

Flexible bodies


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Motivation

While already providing leading edge technology, ANSYS continues to enhance its ability to robustly and efficiently solve complex contact problems


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Projected Contact

Improved pressure results with surface projection

The Surface Projection Based Contact provides more accurate results (stresses, pressures, temperatures) and is now also available for bonded MPC contacts

Regular contact Projection based

Smoother temperature results on a multilayered structure


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Contact accuracy and robustness

Contact stabilization technique dampens relative motions between the contact and target surfaces for open contact

New contact stabilization prevents rigid motion

Adjust to touch causes rigid body motion and leaves a gap


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Performance

Further benefits from GPU boards


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Taking advantage of the latest hardware is mandatory to solve your large models.

A combination of relatively new technologies provides a breakthrough means to reduce the time to solution

Motivation

+


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Distributed ANSYS Supports GPUs

2.1 MDOF, Nonlinear Structural Analysis using the Distributed Sparse Solver

GPU Acceleration can now be used with Distributed ANSYS to combine the speed of GPU technology and the power of distributed ANSYS


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Speed-up from GPU technology

Solder Joint Benchmark - 4M DOF, Creep Strain Analysis

Results Courtesy of MicroConsult Engineering, GmbH

Linux cluster : Each node contains 12 Intel Xeon 5600-series cores, 96 GB RAM, NVIDIA Tesla M2070, InfiniBand

Mold

PCB

Solder balls


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Speed-up from multiple nodes with 1 GPU board per node

Mold

PCB

Solder balls

Results Courtesy of MicroConsult Engineering, GmbH

1 node @ 8 cores, 1 GPU

2 nodes @ 4 cores, 2 GPU

8 nodes@ 1 core, 8 GPU


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Advanced Modeling

Material Models


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Motivation

ANSYS provides a comprehensive library of advanced materials. Some users however need even more advanced models to include complex nonlinear phenomena in their simulations.


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Anisotropic Hyperelasticity plus Viscoelasticity for strain rate effects

Hyperelasticity coupled with Pore Pressure element

Shape Memory Alloy enhanced with superelasticity, Memory effect, New Yield Function, Differentiated Moduli (Austenite, Martensite)

Holzapfel Model - Capture the behavior of fiber-reinforced tissue

Advanced Materials for Biomechanical Applications

Hydrocephalus analysis Hyperelastic material with porous media

Stent modeling using shape memory alloys


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Nonlinear materials support for coupled field elements

Coupled field-elements for strongly coupled thermo-mechanical analysis now accounts for plasticity induced heat generation along with friction effects

Friction Stir Welding including heat generation due to friction and plastic deformation


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Advanced Modeling

Advanced Methods


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Motivation

The solver techniques available from our solutions allow to model complex phenomena. In some cases, better or different techniques are required to improve the accuracy or the convergence of the models.


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Advanced Nonlinear Methods

User can now perform: Buckling from a nonlinear prestressed state with dead loads (new subspace eigensolver)

3D rezoning for very large deformations for a wider range of materials and boundary conditions.

Hot-Rolling Structural Steel Analysis with 3-D Rezoning

Buckling of a pre-stressed stiffened container


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Analyzing Fasteners under Large Deformations

Bolt pretension does not include large rotation effects.

With release 14.0, you can now use Joint Loads: Lock joint at specific load step Apply Pre-Tension or Pre-Torque load use iterative PCG solver for faster runtime

Joint Element - Stress appears without significant bending

Pre-tension element - Significant bending stress with large rotation


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Coupled structures/acoustics simulations

Coupled problems are modeled more efficiently: Quadratic tetrahedral acoustics elements New acoustics sources Absorbing areas Enhanced PML formulation Near and far-field parameters


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Moisture Diffusion

Moisture induces hydroscopic stresses and alters thermal stresses.

Coupled-field elements allow to incorporate moisture effects in thermal, structural and coupled simulations.


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Advanced Modeling

Explicit Analysis


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Motivation

Explicit formulations extend the range of problems a structural engineer can solve. Providing handling capabilities similar to implicit solutions provides an easy transition from implicit to explicit.


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A Common User Interface

Implicit and explicit solutions share the same user interface for a shortened learning curve and allow straightforward data exchange between disciplines

Crimping


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New tetrahedral element

The new tetrahedral element helps quickly model complex geometries for low velocity applications such as drop tests for mobile phones or nuclear equipments Self Piercing Rivet


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Similarly to implicit analyses, 2D plain strain and axisymmetric formulations provide faster computation of explicit solutions

Fast Solutions Using 2-D Formulations

2D forming

Axisymmetric bullet model


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Geometry

Advances for Structural Engineers


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Motivation

With every release, ANSYS improves the quality of the geometry tools available in Workbench in order to increase the quality of the geometric data. Ease of use is also constantly improved to provide more efficient tools.


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Mid Surfacing Improvements

Selection tolerance is available to handle face pairs in case of imperfect offsets. Body thicknesses can be displayed on the model.


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Usability Enhancements

Toolbars can be customized for easy and direct access to preferred features and tools. Hot keys are also available for frequently used operations.


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SpaceClaim Direct Modeler

Preview sharing allow to control topology sharing before transferring the model into Workbench. Multi-face patch option increases the quality of repairs for missing faces.

Regular patch

Multi-face patch


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Physics Coupling

System Optimization with Rigid Body Dynamics and Simplorer co-simulation


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Motivation

Most mechanisms and assemblies are managed via control systems.

System simulation, including the details of the mechanism or assembly, are needed in order to improve modeling accuracy, fidelity and ultimately system optimization.


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Linking Mechanical and Simplorer

Inputs and outputs are defined as pins in the Mechanical model and connected to the schematics of Simplorer


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Simulation Results

Force Applied on Pistons Rotational Displacement

Rotational Velocity


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Some Examples

Aircraft Landing Gear

Simplorer schematic of hydraulic circuit and control

RBD model

Robotic Arm Control

Trace of arm trajectory


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And there is much more


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check the Release Notes!


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Think also of the Technology Demonstration Guide


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Questions?


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Appendix


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Customization

Application Customization Toolkit


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Motivation

As a Mechanical User, you may want to: Customize menus Create new loads and boundary conditions Create new types of plots Reuse APDL scripts without command snippets


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What is the Application Customization Toolkit?

The Application CustomizationToolkit is a tool that facilitates customization of ANSYS Mechanical. It provides a way to extend the features offered by ANSYS products.


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Toolbar Customization through XML Files

1 Convection_Blade_Computation

XML definition:


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Python Driven Loads and Boundary Conditions

Python script:

# Get the scoped geometry: propGeo = result.GetDPropertyFromName("Geometry") refIds = propGeo.Value

# Get the related mesh and create the component: for refId in refIds: meshRegion = mesh.MeshRegion(refId) elementIds = meshRegion.Elements eid = aap.mesh.element[elementIds[0]].Id f.write("*get,ntyp,ELEM,"+eid.ToString()+",ATTR,TYPE\n") f.write("esel,s,type,,ntyp \n cm,component,ELEM")

# Get properties from the details view: propThick = load.GetDPropertyFromName("Thickness") thickness = propThick.Value propCoef = load.GetDPropertyFromName("Film Coefficient") film_coefficient = propCoef.Value propTemp = load.GetDPropertyFromName("Ambient Temperature") temperature = propTemp.Value # Insert the parameters for the APDL commands: f.write("thickness="+thickness.ToString()+"\n") f.write("film_coefficient="+film_coefficient.ToString()+"\n") f.write("temperature="+temperature.ToString()+"\n")

# Reuse the legacy APDL macros: f.write("/input,APDL_script_for_convection.inp\n")


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Writing APDL Commands From the New Definition

! APDL_script_for_convection.inp ! Input parameters: esel,s,type,,10 cm,component,ELEM thickness = 1.1 film_coefficient = 120. temperature = 22. ! Treatment: /prep7 et,100,152 keyop,100,8,2. et,1001,131 keyo,1001,3,2 sectype,1001,shell secdata,thickness,10 secoff,mid cmsel,s,component emodif,all,type,1001 emodif,all,secnum,1001 type,100 esurf fini alls /solu esel,s,type,,100 nsle sf,all,conv,film_coefficient,temperature alls

APDL

WB Mechanical


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An Example: ACT driven Submodeling

Users simply select the coarse models results file, all APDL commands are automatically created no more need for command blocks!


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Advanced Modeling

Offshore Structures


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Over the period of the design of an offshore structure from Concept through FEED and Detailed Structural and Equipment Design there are needs for many different analyses related to global structural design and integrity and detailed component level analysis. To ensure delivery timeliness, and reliability where costs of failure are so high, there is considerable value in compatibility between the respective tools. This is delivered by the ongoing integration of ANSYS AQWA in Workbench and delivery of enhanced capabilities in Mechanical/MAPDL for offshore structures analysis.

Importantly, ANSYS Structural Mechanics products now deliver the ability to conduct both global and detailed analysis of offshore structures subjected to various wave and environmental loadings.

Global Offshore Structures

Local joint flexibility analysis

Global hydrodynamics and structural analyses


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Hydrodynamic Time Response system enhancements include Fenders (similar to contact)

Allows connections between 2 structures or between a structure and a fixed point

Articulations (similar to joints)

Further AQWA Integration in Workbench for Multi-Body Wave Hydrodynamics

Offloading arm represented with series of typical articulations


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Enhanced Environmental Conditions and Cable Behavior in AQWA

Introduction of multi-directional wave spectra allows more realistic modelling of real wave conditions, and is important for the accurate simulation of moored vessels and offshore platforms

Almost any combination of wave spectra to be modelled in the solver modules LIBRIUM, DRIFT and the Hydrodynamic Time Response system in Workbench

To meet API standard (RP2SK), non-linear axial stiffness can be used to define a mooring line

Gaussian formulated wave spectrum now available in the core solver and the Hydrodynamic Time Response system


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Diffracted wave loading Provides simplified pressure loading from

Hydrodynamics Diffraction systems (AQWA) onto MAPDL system

Harmonic Wave Loading Regular wave loading now available for harmonic

response analyses

ANSYS FATJACK (for beam joint fatigue of framed structures) automatically reads the RST file data for harmonic load cases

ANSYS BEAMCHECK (for member checks on framed structures) and ANSYS FATJACK now delivered with Mechanical installation

See Design Assessment for further information

Extended Wave Loading in Mechanical and links to Regulatory Code Checks

Vessel Loading Transfer from AQWA to Mechanical Courtesy of Vuyk Engineering Rotterdam


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Aeroelastic coupling (for wind turbine support structures)

Sequential Allowing structural (ANSYS) and aeroelastic (3rd

party) analyses to be run independently

Just use a provided MAPDL macro to write out input data for the aeroelastic analysis

Fully coupled Co-simulation of structural and aeroelastic tools

Custom build of MAPDL required, with a macro to manage the data availability from and to MAPDL

Coupling Mechanical with 3rd Party Aeroelastic Tools for Offshore Wind Turbine Modeling

Images Courtesy of REpower Systems AG


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Advanced Modeling

Brake Squeal


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Motivation

Brake Squeal is a consistent customer complaints and is associated with high warranty costs.

ANSYS provides the best solution for such analyses, including complex Eigen-Methods to predict onset of squeal, new state-of-the-art linear methods and parametric studies.


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Complex Eigen solve Animate: Complex Mode Shape Contact Status at Pads

ANSYS Solution for Brake Squeal

CAD Mesh &

Connection Setup & solver

Post Processing

Bi-Directional CAD Connectivity

Automated Contact Detection

Provides for sliding contact with friction No match mesh needed Supports higher order elements Automated Meshing

Flexibility to use Linear & Non-linear solver capabilities

Root locus plots Correlation of modes List Strain energy per component per mode

Friction sensitivity study

Physical prototyping time consuming and expensive

Provide more analysis early in the design cycle

Parametric Study by changing friction coefficient

Run set of DOEs

Reuse symmetric modes and just run un-symmetric part

Significant time reduction

Can Include Squeal and Contact damping - Sliding velocity

dependent Friction

ANSYS 14 Structural Mechanics Update

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