MSC Nastran 2013.1

MSC Software: Release Overview - MSC Nastran 2013.1 RELEASE OVERVIEW

Welcome to MSC Nastran 2013.1!The MSC Nastran 2013.1 release introduces a number of new capabilities and enhancements ideal for solving complex multidisciplinary problems. This document details key features available in this release, and how they can be taken advantage of in your simulations. Main areas of focus in this release include the following:

Capability Enhancements

Rotordynamic Analysis•Axisymmetric Rotordynamics Enhancements

•Rotors in External Superelements

Advanced Nonlinear (SOL 400)•Contact User Interface Improvements

•Linear Stress Recovery in Perturbation Analysis

•Thermal Stress Analysis with Shell Elements

•User Defined Subroutine (UDS) Improved Interface

Explicit Nonlinear (SOL 700)•User Defined Services in SOL 700

•New Material Models

High Performance Computing•ACMS (Automated Component Mode Synthesis) Performance Improvements

Miscellaneous•Arbitrary Beam Cross Section (ABCS) Enhancements

•Monitor Point Enhancements

For more details on this release, please review the Release Guide and documentation. Several examples are also available to help you use these capabilities.

Thank you for your continued support of MSC Nastran.

MSC Nastran Product Team

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MSC Software: Release Overview - MSC Nastran 2013.1RELEASE OVERVIEW

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Rotordynamic Analysis

Axisymmetric Rotordynamics Enhancements The MSC Nastran Rotordynamics capability is ideal for determining critical speeds, whirl frequencies, rotor rubbing, windmilling, and other responses inherent to rotary machines. In addition to the traditional line modeling approach used to model rotating machinery, this release offers a higher level of rotordynamics accuracy by allowing them to be represented by axisymmetric configurations. Newly developed axisymmetric harmonic elements provide improved accuracy and visually intuitive representation of the system.

Rotors in External SuperelementsA finite element model is rarely analyzed only once, and often the model is modified and re-analyzed several times. Superelement technology allows analysts to analyze small sections of finite element models, but without the computational costs of complete solutions.

Previously, when employing superlements on rotordynamic models, the rotor model could only be included in the residual structure of a superelement, but in this release, rotor models may be part of the external superelement. Engine manufacturers will find this added flexibility useful when sharing rotor models with primary aircraft manufacturers.

Advanced Nonlinear (SOL 400)

Contact User Interface Improvements The contact capabilities of MSC Nastran provide analysts with a powerful means for studying the interaction of multiple components. A key enabler of the contact capability is the contact table, a summary of specific interactions desired between individual contact pairs.

This release features a new methodology for defining contact interactions that requires less data, which is better organized, is more readable, and is ideal for models consisting of numerous contact bodies. While backward compatibility is maintained with the older keywords, the new approach reduces duplicate specification, improving the ease of contact interaction definitions.

Linear Stress Recovery in Perturbation AnalysisLinear perturbation steps like modal analysis, direct frequency, modal frequency, modal transient, direct complex-eigenvalue and modal complex eigenvalue analyses that follow nonlinear static or dynamic steps, require the element stiffness and mass matrices formed at the end of the nonlinear steps. This release extends availability of this capability to the advanced elements of SOL 400 that are not part of the conventional SOL 101 solution sequence.

Thermal Stress Analysis with Shell ElementsA new capability has been added to allow temperature mapping of multi-degrees of freedom heat transfer shell elements in sequential thermal-mechanical analysis. Since thermal and structural analyses may be performed by different engineer groups with large models, this capability improves data transfer from thermal to structural analysis. Accuracy of the results is also improved with higher fidelity of temperature distribution through shell thickness.

User Defined Subroutine (UDS) Improved Interface The UDS capability in MSC Nastran offers a mechanism to utilize customized subroutines or applications within MSC Nastran. Application examples of UDS include: using proprietary element formulations, extending material property formulations, applying specific rules to a contact problem, or integrating CFD applications.

Previously, UDS required a significant amount of knowledge and implementation of System Component Architecture services. In this release, a new method of creating UDSs requires little or no direct SCA development and significantly reduces overhead work previously associated with UDSs.

MSC Software: Release Overview - MSC Nastran 2013.1 RELEASE OVERVIEW

Explicit Nonlinear (SOL 700)

User Defined Services in SOL 700 MSC Nastran now supports user subroutines for both the fluid (Eulerian) and structural (Lagrange) region through User Defined Services. This capability allows the users to customize the model with user-defined material models, equation of states, flow boundary conditions, friction models etc. for improved simulation results.

New Material ModelsThree new materials have been implemented for explicit nonlinear analysis.

•Johnson-Cook model with a more complex stress-strain relation and damage criteria

•Gurson model to describe the plastic flow, and is available for shell and solid elements

•Gurson flow model that combines with Johnson-Cook failure criterion

High Performance Computing

ACMS (Automated Component Mode Synthesis) Performance Improvements ACMS is an efficient alternative of the Lanczos method for modal-based analysis models that are large in size or require a large number of modes to be extracted. ACMS is especially useful in Automotive NVH analysis where typically large numbers of modes are extracted.

This release delivers 10% to 30% time reductions in the ACMS portions of large scale simulations. In particular, overall runtimes dominated by I/O will be most impacted. Default parameters have also been updated to provide improved partitions in the ACMS method and sparse calculations have replaced dense calculations for further performance enhancements.

Miscellaneous

Arbitrary Beam Cross Section (ABCS) Enhancements ABCSs are commonly used in aerospace and automotive applications in order to obtain unique beam cross sections that minimize mass, maximize stiffness, especially torsional stiffness, and improve crash resistance. Defining such complex ABCSs is more flexible in this release by enabling intersections among branch points (BRP), and allowing multiple BRPs to branch out from each side of a point.

Monitor Point EnhancementsMonitor points enable users to recover results in addition to standard data recovery at a particular location. For example, they can be used to represent summations of specific quantities like displacements, loads, element responses, and nodal forces at user specified locations. This long standing capability has been enhanced to support several solution sequences, along with following improvements:

1. The nodal forces at monitor points may now be output in user specified coordinate system providing additional flexibility. For different engineering groups that frequently share results, this new ability makes it simpler to express results in familiar coordinate systems used internally.

2. A new Monitor Point option allows you to obtain the weighted sum of existing monitor results at specified locations. This new option supports both forces and moments.

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MSC Software: Release Overview - MSC Nastran 2013.1RELEASE OVERVIEW

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MSCNASTRAN*2013NOV*RO

MSC Nastran 2013 – Essential New Real World Behaviors & Breakthrough PerformanceWith your continued support, we at MSC Software remain committed to the persistent enhancement of our core linear, nonlinear and multi-disciplinary technologies in MSC Nastran. The numerous new and current benefits in this single solver demonstrate our commitment on multiple levels.

Customer Driven FeaturesWe value customer feedback. MSC commits itself to meeting customer needs and requirements. Many of the new capabilities and enhancements in this release are a direct result of customer-driven efforts. This includes capability and solver enhancements in the areas of performance, contact, materials, usability, and multiphysics.

Leading Edge InnovationWe push the envelope. MSC continues to bring exciting new technologies to the CAE world. As evident in this release of MSC Nastran, advanced solver technologies and new material model capabilities expand the range of problems that can be solved by analysts with greater accuracy.

High Performance ComputingMSC is focused on bringing you the latest High Performance Computing (HPC) technologies to dramatically increase your productivity. The numerous performance improvements in the solvers and new parallel processing methods available in this release will help you reduce your product design cycle and improve your time to market.

Thank YouMSC Software appreciates the confidence and trust that you, our customers, have placed in our products all these years. This is also demonstrated by the customizations of our solutions and level of integration of our products into your CAE processes. You will continue to see more technologies and capabilities in our products and we, as always, are pleased to have you as a customer and partner.

MSC Software: Release Overview - MSC Nastran 2013.1 RELEASE OVERVIEW