CUBIT 13.0 Release Notes
Contents
1. es Pressures al A Temperatures CUBIT gt SS Displacements COBIT gt Constraints COBIT gt CUBIT list constraint 1 Constraint 1 i Constraint 1 name f POEEDI 2 Type Rigid Body constraint 3 Reference Point vertex 1 Ho Constraint 4 w Dependent Block 1 lt gt Journaled Command lisk constraint 1 Back to New Features Beta Features Cubit remains an active development platform for cutting edge methods in geometry preparation and mesh generation Some features that are still under development may not be quite ready for release but may be valuable in some settings The following is a list of new beta features that have been made available in Cubit version 13 0 Their functionality is not yet complete has not been fully tested however in many settings the new capability may be very valuable Your help in reporting defects and offering suggestions on these features is appreciated To turn on or off any of the features listed below issue the following command from the command line Set developer on off Improved Mesh Based Geometry Webcut The improvements made to the Mesh Based Geomtry engine have significantly improved the robustness of the webcut feature for mesh based geometry Parallel refinement by spawning STK adapt For those who have access to the Sierra stk_adapt module Cubit 13 0 supports parallel refinement To use this feature first create a course mesh for your model T2. 64 bit Version 13 0 with GUI The latest released version of CUBIT deployed to the LAN 32 bit Version 13 0 with GUI The latest released version of CUBIT deployed to the LAN it nogui 64 bit Version 13 0 Command Line only with graphics window Contact Information CUBIT Help For general technical questions including download installation and CUBIT technical assistance cubit helo sandia gov CUBIT Licensing and Passwords Jacqueline Finley Hunter Cubit Licensing Phone 505 284 6969 Email jafinle sandia gov CUBIT Support Lead Tim Tafoya Cubit Support Lead Phone 505 284 2210 Email tdtafoy sandia gov CUBIT Project Lead Brett Clark Sandia National Laboratories Computational Simulation Infrastructure org 1543 Phone 505 844 0434 Email bwclark sandia gov Back to top of page Home Licensing Tutorials Documentation Support Downloads Links yy Sandia Corporation Site Contact Site Map Privacy and Security http cubit sandia gov release_notes 13 0 html 2011 11 16
3. Sheet Bodies gt g Volumes Back to New Features Tolerant Imprinting Handles T Junctions Cubit s tolerant imprinting feature can now handle non manifold junctions such as T junctions in version 13 0 The merge tolerance set by the user is used while imprinting T junctions Below is an example of tolerant imprinting done with the edge of a brick on a surface of a cylinder The highlighted line in the right picture shows where the two volumes successfully imprinted The commands associated with tolerant imprinting are also shown below Imprint Tolerant Body Volume lt range gt Imprint Tolerant Surface lt id gt with Curve lt id_range gt merge Imprint Tolerant Surface lt id gt lt id gt with Curve lt id_range gt merge Back to New Features http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 5 of 11 More Robust Overlap Checks in Tolerant Imprinting With various bug fixes and enhancements made to the tolerant imprinting code the overlap check for tolerant imprinting is now more robust with Cubit 13 0 Back to New Features Volume Overlap Visualization The overlapping region between two volumes may be drawn with the following command This allows you to be able to quickly identify overlapping volumes that may affect your ability to mesh the model The command below will draw the input volumes in transparent mode and draw the volume s of interse
4. to New Features Aprepro Editor Chose http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 7 of 11 Cubit 13 0 now includes an Aprepro Editor within the GUI To create a variable start typing the name in the Variable Name column and the content of the variable in the Current Value column When the variable has been set the Aprepro command is displayed in the Command Line Likewise if a variable is changed on the command line the Aprepro Editor updates to display the current value The editor also automatically recognizes if it is a string or numeric variable Perform Action Anrepra Editor Variable Mame Current value i ivarl is CUBIT gt varl 5 SEE MR eM ET E CUBIT gt 4var2 string 2 var string CUBIT gt Script A Command FAN Error i History The default location for the new Aprepro Editor in Cubit 13 0 is under the Properties Page in the lower left hand corner Like all of the panels in the Cubit GUI the Aprepro Editor can be docked in another location on the GUI or undocked from the GUI To do so click the title of the panel and drag the panel to the desired location An example of docking is shown below The editor can also be turned off by right clicking any panel to display the View Menu as shown below Aprepro Editor y Variable Maru 1 varl 2 Ware Command Panel Variable Name Current Value y File Tools w Display Tools w Custom To
5. CIS Granite and Catia geometry kernels directly within its code base allowing direct manipulation of the native CAD geometry format within CUBIT This reduces the errors and anomalies so often associated with geometry translation CGM also boasts a facet based geometry kernel developed at Sandia that can be used for remeshing or editing old mesh files or models defined by triangle facets In addition CUBIT has developed a comprehensive virtual geometry capability that permits local composites and partitions to geometry without modifying the underlying native geometry representation The user can choose to ignore clean up or add features to the model allowing greater flexibility to meshing algorithms to generate better quality elements CUBIT Environment CUBIT has developed both a convenient command line interface with an extensive command language as well as a polished graphical user interface environment The GUI is based upon the cross platform standard QT which allows the same look and feel on all supported platforms Also included is a graphical environment based upon the VTK graphics standard which has been optimized for display and manipulation of finite element data and geometry Fast interactive manipulation of the model is a tremendous advantage for models with thousands of parts or millions of elements For more information on CUBIT including licensing arrangements and terms see the CUBIT website http cubit sandia gov http cubit sandi
6. CUBIT 13 0 Release Notes Page of 11 m Home Licensing Tutorials Documentation Support Downloads Links CUBIT 13 0 Release Notes Released March 2011 Product Description New Features CUBIT 13 0 CUBIT 13 0 Documentation roduct Highlights Limitations CUBIT 13 0 CUBIT 13 0 Contents of Release Contact Information Defects Fixed CUBIT 13 0 Platforms Supported Known Defects CUBIT 13 0 Product Description CUBIT is a full featured software toolkit for robust generation of two and three dimensional finite element meshes grids and geometry preparation Its main goal is to reduce the time to generate meshes particularly large hex meshes of complicated interlocking assemblies Product Highlights Meshing CUBIT is a solid modeler based preprocessor that meshes volumes and surfaces for finite element analysis Mesh generation algorithms include quadrilateral and triangular paving 2D and 3D mapping hex sweeping and multi sweeping tet meshing and various special purpose primitives CUBIT contains many algorithms for controlling and automating much of the meshing process such as automatic scheme selection interval matching sweep grouping and sweep verification and also includes state of the art smoothing algorithms Geometry Preparation One of CUBIT s strengths is its ability to import and mesh geometry from a variety of CAD packages CUBIT currently integrates the A
7. a gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 2 of 11 New Features in CUBIT 13 0 Breakpad Instrumentation Acis Upgrade New Command to View Duplicate Block Elements Improved Mapping in Presence of Bias Volume Mapper Memory Improvements Import Part Assembly from STEP file Tolerant Imprinting Handles T Junctions More Robust Overlap Checks in Tolerant Imprinting Volume Overlap Visualization Preview Option in Intersect Volume Command Focus Follows Cursor Option Aprepro Editor Python Mesh Import Interface New Meshed Based Geometry Constraints Breakpad Cubit 13 0 now implements Google Breakpad to track crashes that occur in Cubit This new feature sends information on where Cubit crashed within its code We then use the information to make Cubit more stable Back to New Features Instrumentation Along with the usage statistics Cubit 13 0 will gather types of functionality used to allow the team to understand what parts of Cubit are used This will help the team to know where they need to focus their efforts in making Cubit a better product As with the usage statistics tracking the user can turn off this capability Back to New Features Acis Upgrade Cubit 13 0 has upgraded its Acis geometry engine to the most recent version R21 With this upgrade the geomtery engine has bug fixes and enhancements to improve Cubit As usual there is a possibility that the upgrade wi
8. ain entity tree as shown in the example below http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 4 of 11 M Cubit13 0b File Edit View Display Tools Help DSS ESSAN Pa GVVIRAD2 Power Tools 3 Ee Name ID Properties a A o a o e a 4 5 SH AY319930 000 UNC_ASM 1 SH AY319930 000 UNC_ASM gt amp SH AY376814 000 UNC_ASM 1 SH AY319930 000 UNC_ASM SH gt Q SH AY376815 000 UNC_ASM 1 SH AY319930 000 UNC_ASM SH gt Q SH AY376816 000 UNC_ASM 1 SH AY319930 000 UNC_ASM SH gt amp SH AY376814 000 UNC_ASM 2 SH AY319930 000 UNC_ASM SH a SH AY376815 000 UNC_ASM 2 SH AY319930 000 UNC_ASM SH a SH AY376803 000 UNC_ASM 1 SH AY319930 000 UNC_ASM SH D g SH AY376803ITEM1 UNC 1 SH AY319930 000 UNC_ASM SH 4 g SH AY376803ITEM2 UNC 1 SH AY319930 000 UNC_ASM SH gt g Volume 32 32 gt BS SH AY376816 000 UNC_ASM 2 SH AY319930 000 UNC_ASM SH gt Q SH AY376814 000 UNC_ASM 3 SH AY319930 000 UNC_ASM SH gt BS SH AY376815 000 UNC_ASM 3 SH AY319930 000 UNC_ASM SH gt BS SH AY376816 000 UNC_ASM 3 SH AY319930 000 UNC_ASM SH gt Q SH AY376815 000 UNC_ASM 4 SH AY319930 000 UNC_ASM SH gt Q SH AY376816 000 UNC_ASM 4 SH AY319930 000 UNC_ASM SH BS SH AY376815 000 UNC_ASM 5 SH AY319930 000 UNC_ASM SH gt S SH AY376815 000 UNC_ASM 6 SH AY319930 000 UNC_ASM SH gt HE Boundary Conditions gt Materials gt 2 Groups gt
9. by using weight factors to control force transmission to be specified outside of CUBIT Constraints are supported only by the Abaqus Importer Exporter for Cubit 13 0 Contact the CUBIT support team if support in additional file formats is needed To create a constraint use one of the following commands Create Constraint Kinematic Distributing name lt name gt vertex node lt id gt sideset lt id gt Create Constraint Rigidbody name lt name gt vertex node lt id gt block lt id gt A constraint s name dependent object and independent object can be changed using the following commands Modify Constraint lt id name gt name lt name gt vertex node lt id gt sideset lt id gt Modify Constraint lt id name gt name lt name gt vertex node lt id gt block lt id gt Constraints can be listed or deleted using the following commands List Constraint lt id_range gt Delete Constraint lt id_range gt http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 9 of 11 Constraints can also be found in the tree under the section Boundary Conditions and FEA in the Power Tools Actions performed in the tree are reflected in the command line as shown below Power Tools ax ai m 3 2 x Current View Full Tree RF Mame ID Properties af H 2B cro Sy FEA y E Blocks Ga Side Sets 7 Ki Forces F Accelerations TV Command Line amp Velocities
10. ction as red shaded solids The Add keyword will draw the results on top of the current graphics display Without the Add keyword the display will only show the specified volumes along with the intersection volume s Draw Volume lt id gt lt id gt Overlap Add There are two ways to access this feature from the GUI The first place it is located in is the Geometry Power tool as seen below on the left The second place is in the ITEM tool as seen on the right in the Prepare Geometry step To visualize the overlapping volumes for both methods right click on a specific pair and select Draw Volume Overlaps Power Tools m x Power Tools a x Gg Volume IDs Shortest Edge Length Manage Overlapping Yolumes Use the button below to detect any volumes Import or in your model that are overlapping Create Auto update Detect Overlapping vols Geometry Entity Data Show Options Draw volume Overlaps Reset Graphics Prepare Geometry Back to New Features http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Preview Option in Intersect Volume Command Page 6 of 11 The following command can also be used to identify overlapping volumes The computed intersecting volumes will be drawn as red shaded solids For best results change the graphics mode to transparent o
11. d defects contact Tim Tafoya Known Defects in CUBIT 13 0 The following items are bugs or limitations that may be encountered in the current release of CUBIT For more information on these defects or to report additional defects contact Tim Tafoya tditafoy sandia gov Known Defects in CUBIT 13 0 Suggested Work around The defects listed above are only those user reported issues deemed critical or blocker For information on other known defects contact Tim Tafoya Documentation Updates The CUBIT 13 0 online documentation may be found at the following URL http cubit sandia gov help version13 0 cubithelp htm A PDF version is also available for download The cubit GUI installation also includes the full user documentation included with the program The user s manual may be accessed from the Help menu CUBIT 13 0 Contents of Release Cubit Program The installation package includes executables and libraries packaged in tar gz files for Linux machines For Windows the package is in a self installing executable and for Mac OS X a dmg file is provided Both a command line and GUI version of CUBIT are included with the installation package for all platforms Documentation Linux Windows and Mac versions include full online documentation Windows also includes chm Windows Help File of the complete documentation that can be run separately from CUBIT Platforms Supported CUBIT 13 0 supports the following Platf
12. hen using the command below indicate the number of processors and the base filename to be used Numsplit indicates the level of refinement desired Once the process is finished there will be Exodus files saved in the format of filename exo t p where t represents the total number of processors and p represents the processor rank that created the file Refine Parallel Processors lt int gt File lt filename gt Numsplit lt int gt Overwrite Back to New Features Limitations in CUBIT 13 0 e As of Cubit 13 0 the Granite Geometry Kernel is no longer supported http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 10 of 11 e The Mac OS X port does not support the changing mouse cursors on pre selection It is recommended that a 3 button mouse be used for the Mac OS X version since interactive transformation utilizes all three buttons Fixed Defects in CUBIT 13 0 The following items are the user reported bugs fixed since last release of CUBIT September 2010 For more information contact Tim Tafoya tdtafoy sandia gov Resolved Defect 9028 Labels not working on Linux 9018 Surface normals inconsistent after tet refinement on merged surfaces 8996 Tet mesher gets stuck in infinite loop 8991 Crash on chop command 8980 Pillow Face GUI Bug The defects listed above are only those user reported issues deemed critical or blocker For information on other resolve
13. ll result in changes to journal Ds Back to New Features http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 3 of 11 New Command to View Duplicate Block Elements Cubit 13 0 now gives an option to allow elements to be included in more than one block The default behavior is to prevent any given element from being included in more than one block The following command shows how to turn this option on However since material properties are assigned to blocks using this command to allow duplicate block elements may result in an element being assigned to multiple materials Set Duplicate Block Elements on OFF Back to New Features Improved Mapping in Presence of Bias In previous versions some bias would skew mapped surfaces and volumes Mapping with a bias now acts as expected Below are examples of previous versions on the left and Cubit 13 0 on the right Back to New Features Volume Mapper Memory Improvements Improvements have been made to the Volume Mapper in Cubit 13 0 and is now 2 3 times faster than version 12 2 Also the Volume Mapper now uses half of the memory compared to older versions Back to New Features Import Part Assembly from STEP Beginning with version 13 0 Cubit will read assembly information embedded in the imported STEP file No additional arguments are required The resultant assembly part structure will be displayed in the GUI s m
14. ols w Select Geometry Tools o Select Mesh Tools w Select FEA BC Tools w Select CFD BC Tools nf Select Exodus BC Tools Back to New Features Python Mesh Import Interface Cubit 13 0 includes a feature that will allow users to use Python to import any mesh format into Cubit This new Python interface supports nodes elements blocks sidesets and nodesets An example of a generic homemade mesh file and the mesh created by Cubit is shown below http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 8 of 11 E mesh_file mymesh Notepad TB File Edit Format View Help J 0 0 5 5 0 0 5 Back to New Features New Meshed Based Geometry Engine The Mesh Based Geometry engine has been greatly improved The commands that have the geometry keyword now generate non manifold curves and surfaces where indicated by nodesets and sidesets Also for the Cubit 13 0 release the Import mesh geometry and Create mesh geometry commands are significantly faster and are also able to handle non manifold geomtry Back to New Features Constraints Cubit 13 0 now supports constraint boundary conditions Constraints couple the motion of a set of nodes to the motion of a reference node Rigid bodies and kinematic constraints do exactly this for blocks and sidesets respectively A distributing constraint allows users to average the constrained motion of a sideset
15. orms e Linux RedHat Enterprise 5 32 and 64 bit e Windows 2000 XP Vista 32 and 64 bit e Mac OS X and Intel based universal Non Sandia Users CUBIT is available for government and academic use For information on licensing CUBIT go to the follow URL http cubit sandia gov licensing html For current CUBIT users CUBIT 13 0 may be downloaded from the website at the following URL http cubit sandia gov downloads html If you obtained a password since the release of CUBIT 10 0 your password should work for 13 0 also Sandia Personnel Only Windows Download a Windows installation file from the dropzone Go to the following directory dropzone public cubit Windows Copy the file Cubit WindowsGUI 13 0 exe to your windows hard drive Double click on the file and follow the installation instructions http cubit sandia gov release_notes 13 0 html 2011 11 16 CUBIT 13 0 Release Notes Page 11 of 11 MAC OS X Download a Mac OS X disk image file from the dropzone Go to the following directory dropzone public cubit MAC_OS X Copy the file Cubit_GUI_13 0 dmg gz to your Mac harddrive Use gunzip to unpack the disk image file LINUX LANS Check with your local LAN administrator for instructions on how to access CUBIT on your local LAN In most cases typing one of the following commands at the UNIX prompt should allow you to execute CUBIT In some cases the full path will need to be specified projects cubit lt cubit_command gt
16. r wire frame mode so the intersection is visible Otherwise the intersection volume will be hidden by the volumes being intersected Intersect Volume Body lt range gt Back to New Features Focus Follows Cursor Option With Volume Body lt range gt Preview The new focus follows cursor option can be set from the Tools Options General menu see below The focus to type text will automatically turn to the command line panel when the mouse falls in the command line window The focus follows cursor option allows the focus to snap to the command line ready for you to type when the mouse falls within Command Line panel With the option on you won t have to click in the Command Line Panel to begin typing If the mouse is in the panel then you can start typing automatically This function only works with the Command Line Panel amp Options Custom Tools Display General Geometry Defaults E History Label Defaults E Layout Mesh Defaults Mouse Post Processor H Quality Defaults Unsaved Data C Prompt for Unsaved Application Data Prompt for Unsaved Journal Data Script Playback C Change to Script Directory Journal Editor Prompt When Translating From Python Default Syntax Cubit Font Family Ms Shell Dlg 2 Font Size a Sample Tex Focus Follows Cursor in Command Window Enable Focus Follows Cursor Startup Show Startup Splash Screen Back
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