Jeżeli do oprogramowania inżynierskiego można podpiąć własne procedury to NVIDIA udostępnia darmowy driver NVCC za pomocą którego można kompilować kod napisany w C. Można to robić z Visual Studio (od wersji 10) pod Windows lub używając gcc pod Linuxem.
Wówczas oprogramowanie optymalizuje się pod posiadaną kartę graficzną. Warto mieć kartę o CUDA capability większym niż 2.0 ze względu na obsługę typu double.Zobacz Komentarze Newsów
Czy ktoś z forum korzysta może z Elmera? Bardzo ciekawi mnie jak to działa. Bo z tego tutka wynika, że jest OK, a tymczasem ja próbowałem... bezskutecznieZobacz Komentarze Newsów
Postów: 651 Miejscowość: Warszawa, PL Data rejestracji: 18.10.07
Dodane dnia 03/09/2008 22:17
What's New: MD Nastran R2, 2.1
MD Nastran R2 and R2.1 bring powerful new analysis features and enhancements in the areas of contact; nonlinearity; noise, vibration, and harshness (NVH); acoustics; automotive powertrain; crash and occupant safety; high performance computing; assembly modeling; optimization; rotor dynamics; and aeroelasticity. The combined enhancements in MD Nastran R2 and R2.1 are summarized as follows.
Contact in Linear and Nonlinear Solutions
MD Nastran introduces contact in linear and nonlinear solutions, with the ability to easily convert from linear contact in SOL 101 to nonlinear contact in SOL 400.
* Nonlinear Contact in SOL 400. Provides general multibody contact under full nonlinear conditions of large contact motion, nonlinear materials, large rotation, and large strain. SOL 400 features deformable-deformable contact, deformable-rigid contact, and contact with friction.
* Linear Contact in SOL 101. Provides an algorithm similar to SOL 400 for use in SOL 101 linear analysis. A SOL 101 model with linear contact can be converted to simulate nonlinear behavior in SOL 400 without having to redefine contact.
* Permanent Glued Contact in Linear Solution Sequences. Provides a special type of contact model to be used when the contacting surfaces have no relative normal or tangential motion. Permanent glued contact is available in most of the linear solutions (except SOL 200), and provides a convenient way to join dissimilar meshes. Glued, linear, and nonlinear contact make use of the same user interface.
* (New in R2.1) Simplified Contact Definition. A new ALLBODY contact option saves significant time in preparing the input definition.
* (New in R2.1) Improved Performance. Contact performance has been greatly improved, particularly for large models.
* (New in R2.1) (Prerelease) Glued Contact in Optimization. A prerelease version of glued contact is available in SOL 200.
Advanced Integrated Nonlinear Analysis
SOL 400 has been extensively enhanced for multistep nonlinear analysis of large strain and material behavior, with or without contact.
* Nonlinear Contact Modeling. A new contact algorithm has been implemented in SOL 400 to perform general multibody contact for large contact motion, nonlinear materials, large rotations, and large strains. It is available in both nonlinear static and nonlinear transient analysis.
* Nonlinear Elements and Materials. Enhancements include orthotropic material properties for three-dimensional and plane strain behavior, nonlinear gasket material properties for compression behavior, elasto-plastic material properties for use in large deformation analysis, and failure model properties for linear elastic material. Where appropriate, most elements in MD Nastran have been extended to include the effects of finite strain. Also, layered axisymmetric, shell, and solid composite elements are now available. The CQUADR and CTRIAR elements have been extended to nonlinear analysis.
* Nonlinear Procedures. New analysis chaining procedures have been added to conveniently define multiple load steps, run multiple independent cases, and specify multiple and mixed types of analyses in one job. For example, the user can pretension a bolt structure as a first load step in a multistep nonlinear analysis. Adaptive stepping schemes have been introduced that automatically modify load increment or time step size to accelerate convergence.
* Crack and Delamination. A new virtual crack closure technique (VCCT) calculates energy release rates for sharp cracks. In addition, a new library of interface elements (cohesive zone modeling) can be used to simulate the onset and progress of delamination.
* Kinematic Elements. New rigid elements with Lagrange formulations are now available for use in geometric nonlinear analysis involving large rotations. These elements have been implemented in both nonlinear static and nonlinear transient analysis.
* (New in R2.1) Differential Stiffness. Improved nonlinear differential stiffness with expanded options to selectively turn off differential stiffness (NLDIFF) for improved convergence is now available.
* (New in R2.1) Relative Boundary Conditions. A new relative enforced displacement capability (see the SPCR Bulk Data entry) is now available; this is particularly useful for bolt modeling.
Implicit Nonlinear Analysis (SOL 600)
* Heat Transfer. Advanced thermal analysis is now available in SOL 600, including an efficient hemi-cube view factor calculation method, and automated procedures for thermal stress analysis based upon a prior heat transfer simulation. In addition, thermal analysis of composites includes calculation of the thermal gradient through the thickness.
* Modeling Enhancements. Connector technology has been enhanced to include large deformation formulations of the CFAST, CWELD, and CBUSH elements. Enhancements for facture mechanics include the calculation of stress intensity factors using the VCCT or Lorenzi methods, and the prediction of delamination.
* Performance Improvements. A new streaming input option is available that eliminates transfer files. Streaming input will be automatically turned off for analysis scenarios that are not supported. The analysis of composite shells has been improved such that assembly time has been reduced-often by a factor of ten-and memory requirements have been substantially reduced as well. Other performance improvements include an iterative solution that runs out-of-core, and direct PLOAD4 support.
* (New in R2.1) Glued Contact. Permanent glued contact is now supported for conveniently joining dissimilar meshes.
* (New in R2.1) Solver Options. A mixed derivative solver has been added as an option.
Explicit Nonlinear Analysis (SOL 700)
Several new SOL 700 analysis capabilities are introduced in this release.
* Airbags and Occupant Safety. Fluid structure interaction (FSI) is now available in SOL 700 to simulate the complex behavior of multicompartment airbags and their interaction with anthropomorphic test devices (ATDs) during crash scenarios. Airbag inflation is based on full gas dynamics and finite volume (Eulerian) technology with adaptive meshing capability. The airbag surface acts as a coupling surface which adapts itself and follows the expanding Eulerian elements as the gas jet flows inside the bag. In addition to full gas dynamics, SOL 700 also supports the conventional uniform pressure method to simulate airbag behavior.
* Time Domain Noise, Vibration, and Harshness (NVH). This technique is based on the fast Fourier transform (FFT) method to compute frequencies and mode shapes of highly nonlinear and dynamic systems such as a vehicle running over a rough road. The advantage of time domain NVH is its ability to capture the nonlinear effects of contact, spring, bushing, tire, and suspension behavior.
* Prestress. Prestressing is now performed by a double precision version of the implicit solver, and the results are used as the prestate for explicit simulations such as bird strike and blade-out applications.
* Nastran Native Output. This release produces native MD Nastran output files for seamlessly postproces sing explicit events with MD Patran.
* New Material and Element Formulations. Thirteen new material models and five element formulations are added in SOL 700.
* Contact Features. SOL 700 now supports many new contact capabilities such as glued contact, tied nodes to surface, tied shell edge to surface, tied surface to surface, spot weld contact, single edge contact, and force transducers.
NVH and Acoustics
* Frequency Response Functions (FRFs) and FRF Based Assembly (FBA). A powerful new capability is available in MD Nastran R2 for frequency response analysis based on representations of components by their FRFs, and on assemblies of such components by the FBA process. FRF-based assemblies provide an effective means for revealing how excitations on one component affect responses at other components in the assembly.
* Exterior Acoustics. MD Nastran R2 is the production release for the exterior acoustics capability. It extends acoustics applications to unbounded regions such as radiated acoustics from an engine. A new sparse solver is available for the efficient solution of the unsymmetric matrices encountered in exterior acoustics frequency response analysis.
Numerical Enhancements
* Sparse Solvers. Two new sparse solvers have been introduced: TAUCS (statics) and UMFPACK (unsymmetric). The UMFPACK solver provides scalable performance for exterior acoustics. In addition, the Lanczos method has been enhanced to take advantage of available memory. Automatic optimal reordering selection has been implemented for solid models to eliminate requiring the user to set flags.
* Iterative Solvers. Restrictions to the CASI iterative solver have been relaxed for statics of large solid models (e.g., engines). This includes an expanded list of supported element types.
* ACMS. Automated component modal synthesis (ACMS) has been extended to external superelements to provide significant reductions in computational time, I/O, and scratch space. One typical case study demonstrated improvement by an order of magnitude.
* Other HPC Enhancements. MD Nastran R2 has been ported to the Microsoft Compute Cluster. The compute kernels for x86_64 platforms have been optimized for both Intel and AMD-based systems. Improved user diagnostics provide a pivot ratio bar chart to help localize model singularities.
* (New in R2.1) Iterative Solver for Nonlinear Analysis. An iterative solver option is now available for nonlinear contact analysis of large solid models, as well as linear contact. Up to five-fold increases in speed have been achieved.
* (New in R2.1) Memory Management. Users can now control the amount of memory available for the UMFPACK solver to ensure adequate memory at runtime.
* (New in R2.1) (Prerelease) Sparse solver information output (MDTSTATS). Matrix diagonal term statistical output is available via the new MDTSTATS feature for use in determining model quality.
Elements and Connectors
* Connectors. A new seam weld connector element (CSEAM) is now available for assembly modeling. It features extended capabilities for connecting higher order elements; mesh-independent connections to top/bottom shell patches defined either by property IDs or element IDs; tailored parts connection; and support for anisotropic material properties. For spot weld elements (CWELD, CFAST), end point displacement output can now be obtained to view the relationship between the spot weld and the connecting shells. A new connector type, RBE2GS, is introduced to optionally search and connect independent grid points of the two closest RBE2 elements within a specified search radius.
* Composite Beam Using Variable Asymptotic Method (VAM). The arbitrary beam cross section capability has been enhanced to support composite materials. A new three-noded composite beam element (see the CBEAM3 Bulk Data entry) represents the cross-section and layup of plies, and accounts for interaction among plies. It provides an efficient alternative to conventional 3-D modeling for beam-like composite structures such as rotor blades and shell stiffeners.
Optimization
* Topology Optimization. This release provides combined simultaneous topology, sizing, and shape optimization to find potentially better designs. Different mass targets can now be applied on multiple design parts of the structure. Symmetry constraints have been extended to cyclical applications such as car wheels. An adjoint design sensitivity analysis method has been implemented for inertia relief sizing optimization. Significant performance enhancement with minimum member size control has been achieved, particularly for large numbers of sizing design variables.
* Automatic External Superelement Optimization (AESO). This new feature automatically partitions the model into designed and nondesigned (external superelement) parts for efficient optimization. An order of magnitude increase in speed can be achieved without requiring user knowledge of superelements.
* Randomization (Prerelease). This randomization capability provides a way to stochastically introduce uncertainty into a model, such as tolerances in connectivity, properties, and loads. The user selects the outputs to monitor. This beta capability is a first step in developing a multirun environment to spawn multiple jobs, collect the results, and perform statistical postprocessing.
Rotor Dynamics and Aeroelasticity
* Rotor Dynamics. Unbalanced loading can now be used for frequency response analysis with the rotor dynamics option. Frequency response case control can be used directly in SOL 146, since multiple RGYRO subcases can now be used in rotor dynamics. The specification of damping has been simplified, and now allows for new damping formulations such as hybrid damping. In addition, as a prerelease capability, the effects of rotor stiffness, mass, and damping can be included in SOL 200 optimization.
* Aeroelasticity. Monitoring points can now be updated and summed. A new type of monitoring point (MONCNCM) has been introduced for monitoring stripwise aerodynamic results such as lift and pitching moments. Other enhancements include various splining techniques for aerodynamic structural applications.
* (New in R2.1) Spline Application Programming Interfaces (APIs). Support has been added for user-defined splines (SPLINEX) via an API.
Pozdrawiam,
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Bulix 26.01.2022 Witam, szukam osoby która ogarnia program FEMM.
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Czy znajduje się na forum osoba która ma doświadczenie w obliczeniach wytrzymałościowych wózków wagonowych ?
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