Nuove Versioni 2023 R1

Rilascio delle le nuove release di midas NFX e midas MESHFREE

A cura di Redazione

MIDAS IT è costantemente impegnata a fornire strumenti CAE competitivi e sempre aggiornati ed e-FEM, partner ufficiale certificato per il settore meccanico in Italia, è lieta di supportare i clienti con propri servizi di formazione e assistenza, puntuali e di esperienza.

Vogliamo esprimere la nostra sincera gratitudine per la vostra fiducia e il vostro continuo interesse per i nostri prodotti.

Siamo lieti di annunciare il rilascio delle nuove “major release” di midas NFX e midas MESHFREE, versioni 2023 R1.

midas NFX 2023 R1

Multi-disciplinary integrate analysis solution for optimal design

midas NFX fornisce un ambiente di modellazione e calcolo integrato e completo, per l’analisi strutturale, termica, fluidodinamica, cinematica e di ottimizzazione.  Con un unico modello ed in un unico ambiente di lavoro è possibile svolgere diversi tipi di simulazioni e accoppiare diverse fisiche fra di loro, grazie ad una singola interfaccia utente windows-based, snella e facile per i progettisti, completa e veloce per analisti esperti.

Major updates.

    • Nuove funzionalità alla CFD table
    • Strumento di generazione automatica delle funzioni
    • Funzione di rigenerazione automatica del mesh seed su elementi 2D
    • Strumento di connettività mesh-geometria
    • Stabilizzazione del kernel Parasolid e dell’ Auto-Meshing
    • Variabili di forma per il monitoraggio di analisi di flusso
    • Aggiornamento normativo per la analisi spettrali (design spectrum)
    • Aggiornamento della CAD interfaces
    • Altri miglioramenti e soluzioni a problematiche

[ …continua in lingua Inglese ]

Nuove funzionalità alla CFD table _

In the existing midas NFX, the complex formulas and variables were used to transfer data to the CFD solver and perform analysis with high flexibility. However, as the complexity of the formulas increased, there were difficulties with the Interpolate File function, and it was not possible to verify if it was appropriately reflected.

To address these two drawbacks, we have introduced a new feature called “CFD Table Function” that allows easy application of complex spatial, temporal, temperature, and pressure variables in the form of tables and visually previewed graphs. It is provided in a table format with two columns for variable-value pairs, allowing users to input directly or simply copy and paste external data for convenient application.

While the Interpolate function allows for linear extrapolation through multiple data points, it required the user to define the entire analysis range. Additionally, for out-of-bounds values, only linear extrapolation based on the two closest data points was performed. As the complexity or scope of the analysis increased, defining these points became more challenging and inconvenient.

To address this issue, the CFD Table Function now offers five different modes for handling out-of-bounds values. This   allows   for   automatic   definition   of   final   values   or   specific   values   beyond   a   certain   threshold. For recurring operating conditions, periodic conditions can be specified to repeat infinitely over time. Furthermore, in addition to the existing linear extrapolation, the function now supports second-order nonlinear extrapolation.

The reference diagram below provides further details on the data processing methods for each item.

Funzione di rigenerazione automatica del mesh seed su elementi 2D _

To achieve cost-effectiveness in the generation of manual mesh, we introduced a partially Size-Control feature that assigns seeds and generates elements. After the generation, a review is conducted, and if any elements are deemed unsuitable, they are removed and regenerated in an iterative process.

To improve this process, a functionality has been added to dynamically change the seeds of 2D elements based on their shape in real-time. As a result, real-time verification of element quality is possible, enabling cost-effective element generation. This feature is applicable not only to 2D elements used in large and sheet-like structures but also to 3D shapes. Even when users manually create 2D shell elements on the surface and convert them to 3D solid elements within enclosed spaces using the [2D -> 3D] function, this feature can be utilized.

Furthermore, the newly added [Geo.Relation: Shape-Mesh Connectivity] allows users to manually apply shape-based conditions as needed.

Strumento di generazione automatica delle funzioni _

A new feature has been added to automatically generate commonly used functions using guide images and intuitive parameters.

This feature is specifically applicable to the “Time Functions” used in structural analysis settings and the “CFD Table Function”. These functions have been developed as separate modules, and based on the input parameters, the values are automatically interpolated and applied as table values.

This simplifies the process and improves the efficiency of applying functions.

Strumento di connettività mesh-geometria _

In general, during the analysis setup process, the automatic mesh generation feature is commonly used to create  meshes,  while  load  and  boundary  conditions  are  directly  applied  to  the  geometric  shape.  When generating the input data (*.mec, *fin) to pass the input conditions to the analysis solver, the information of automatically connected elements and nodal points on the geometric shape is recognized.

However, if users manually create the mesh or modify an existing mesh created using the automatic mesh generation feature by moving/copying it, the connection between the geometric shape and the mesh is disrupted. In such cases, the load and boundary conditions applied to the geometric shape are not connected to the mesh, requiring the definition of loads and boundary conditions on the nodal points or elements of the mesh set, causing inconvenience.

To address this issue, the [Geo.Relation] feature has been developed. With this feature, when a geometric shape exists, a 2D mesh can be created for the shape, and even when creating a 3D solid mesh using the [2D- >3D] feature, the [Geo.Relation] feature can be used to automatically search and connect elements and nodal points to the faces and edges of the underlying geometric shape within a specified tolerance range. By doing so, when defining load and boundary conditions on the geometric shape, they are connected to the elements and nodal points of the automatically connected solid mesh, enabling the execution of the analysis.

Stabilizzazione del kernel Parasolid e dell’ Auto-Meshing _

Based on the latest updated Parasolid kernel, several instabilities in element generation for surfaces with B- spline surfaces, edges, cones, and other curved shapes were identified and addressed for improvement. Particularly, focused efforts were made to enhance exception handling for Parasolid kernel issues.

Furthermore, issues that caused the meshing process to abruptly terminate without specific error messages during mesh generation have been resolved. The Sliver Face handling process has been strengthened, and errors causing mesh failures during the internal remeshing process of faces have been corrected.

Moreover, certain issues regarding degraded mesh quality on surfaces with extreme points have been partially addressed, resulting in significantly enhanced stability for automatic mesh generation.

Variabili di forma per il monitoraggio di analisi di flusso _

In order to evaluate convergence and changes in composition during fluid analysis, monitoring data is specified. In the previous version (NFX2022), the fluid component results in the general/advanced modules were provided based  on  nodal  points.  However,  the  representation  of  variations  was  inconvenient  as  it  was  based  on individual entities, making it difficult to examine results for groups of entities such as surfaces/outlet surfaces, specific cross-sections, or average values within a certain volume.

To address this issue, improvements have been made to allow the individual output of monitoring results in categories such as nodal points, surfaces, and volumes. For group entities like surfaces and volumes, various calculation methods such as maximum, minimum, absolute maximum, absolute minimum, summation, and average values are now available for analysis. This enhancement provides more flexibility and convenience in examining results for shape/element groups

Aggiornamento normativo per la analisi spettrali (design spectrum) _

In the design spectrum generation function within the response spectrum analysis, we have included the latest standards in the database (DB). Specifically, we have added the updated criteria provided by the Korea Institute of Civil Engineering and Building Technology (KICT) for seismic loads, namely KDS 41 17 00:2019 and KDS 17 00 00:2018. Additionally, we have incorporated the design spectrum databases for IS 1893(2016) and Taiwan(2006) into the system.

These additions ensure that the design spectrum functionality is up-to-date and encompasses a wider range of seismic design requirements.

Aggiornamento delle CAD Interfaces _

The CAD Interface was updated according to the CAD Version update. Support for the latest version of CAD Interface may be delayed depending on the supplier’s update environment. If the newest version is not supported, please convert it to Parasolid or STEP file. We will do our best to reflect on the latest version of CAD quickly

Altri miglioramenti _

Individual options for STR/CFD analysis
In the previous setup, analysis options such as analysis process configuration, convergence options, and the selection of compressible solvers were stored in the user’s local PC registry. This caused inconvenience as the relevant option information was not retained when performing different types of analyses. To address this issue, we have made improvements by separating the analysis options required for structural (STR) and computational fluid dynamics (CFD) analyses. The information is now recorded in the NFX settings file (*.nfx), allowing users to quickly review the settings at any time. The STR/CFD analysis options can be accessed and reviewed within their respective analysis ribbon tabs.

Added function to change work plane grid color.
NFX 2023 version has been updated to allow color selection for the grid in the work plane when modifying geometric shapes. By enabling color selection in [Options > General > Graphics > Guides], users can customize the line color. If color selection is disabled, the default value of gray will be automatically applied. These option settings are stored in the local PC registry and will be automatically applied when the program is launched.

Improvement in Calculation Method for 1D/2D/3D Nodal Averaging and Result Combination in Structural Analysis.
A unified nodal averaging and linear combination calculation method has been implemented for all dimensions of elements (1D/2D/3D) used in structural analysis. It is now optional for users to specify and apply these methods. The nodal averaging calculation method can be either Simple Average or Exact, where Simple Average is the sum of results divided by the number of nodal points, and Exact involves re-evaluation using specific equations after summing the component values. Similarly, during result combination, the linear combination method can be Simple Addition or Exact, where Simple Addition involves adding nodal result values, and Exact involves summing component results and recalculating using specific equations. Users can choose and apply these methods as needed.

Optimization of Large-Scale Frequency Response direct Solver
During frequency response analysis using direct solvers for models with more than one million elements, abnormal termination issues were observed in certain PC environments. To address this, the direct solver for large-scale models has been optimized, enabling normal analysis execution.

midas MESHFREE 2023 R1

Multi-disciplinary integrate analysis solution for optimal design

Scopri un nuovo modo di fare simulazione.

Nell’agosto 2018, MIDAS IT ha rilasciato MESHFREE 1.0 introducendo un nuovo paradigma nella tecnologia CAE.

L’impiego di una tecnologia innovativa di creazione della griglia di calcolo ha permesso il superamento dei tradizionali limiti dei prodotti FEM di mercato. MESHFREE guida il cambiamento nel processo CAE nella fase di progettazione, consentendo ai progettisti di eseguire in piena autonomia analisi per la verifica delle prestazioni dei prodotti e ottimizzarli.

In MESHFREE 2023, per consolidarsi come partner ideale ed affidabile, è stata migliorata la facilità d’uso e sono stati compiuti sforzi per una migliore robustezza software e un miglioramento continuo.

[ …continua in lingua Inglese ]

Boundary constrain

MeshFree is an algorithm based on the IBM (Implicit Boundary Method) that generates a grid for analysis. In previous versions, an issue was identified where the local topology optimization density calculations fluctuated in shape boundary regions with multiple surfaces. To address this, improvements were made to ensure that the density calculations during the computation process adhere to the normal range of 0.0 to 1.0, taking into account boundary recognition and stiffness density considerations. Further validation was conducted by comparing and verifying the trends and effectiveness of the results with the FEM (Finite Element Method) algorithm.

Improvement in Result Curve Calculation

We have identified an issue where the application of the curve function for the result values was causing abnormal terminations in certain customer PC environments after completing the MeshFree analysis. However, we have resolved this error by modifying the curve function to perform correctly for the entire analysis module.

CAD Interfaces update

Support for the latest version of the CAD interface may be delayed depending on the supplier’s update environment. If the newest version is not supported, please convert it to a neutral file such as Parasolid or STEP file format. We will do our best to reflect on the latest version of CAD quickly.

Fixing CAD Interface Recognition Error

We have identified an issue in the web authentication method where the modules for SolidEdge and CATIA v4,5 in the CAD interface options were displayed and applied incorrectly. However, the problem has been resolved, and they are now functioning correctly.

Error 1000 Related to License Packing Module

We have identified an issue where certain security programs were mistakenly detecting and blocking the software due to changes in the license packing module. However, we have addressed this problem and made necessary improvements to ensure that there are no security issues arising from certain option changes.

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