TrueGrid ® Brochure
Contents
1. eee S 18e 2 z QM BESSSERENRSEERAN S o P gape AL rrtt D o HB wit ERARE eb cw e gt Oy 22 T MMCC CELEEEEEEEEEEEEEH H eee o m o g co MEN HH HH 2 D Iv TM Halt 1 ea ERE BRL 0 o 6 5 rf Oy TATE EERE EEE Cee p 5 5 5 oz TT CEE EEE 2 Bey o FMR 2 gE 1 EE e es 5 im soy wes Lg S as E R 2 g 5 T 2 ES MANA a ME E qu E 5 gc gt od PE um E O b S 6 t MEET EH 2 c 000 Mio 5 gs s un 5 281 anms Bee B Bo ci 2 ZE N Qoo O o0 Step 4 Project the Mesh and Replicate The faces of the mesh are projected to the surfaces using the following commands WW M Je S um WS WW WR CV EI A ux GF Jb 7 uo su x EJ o sb o 2 lu 2 EIL d I Qs Sq gt ed 5 5r Z2 3 8 4 une Wi ES eee RARER XX YW NEG NY TAK Sh A MN ERR Y 0 72 Son WX NN QNS NN NY SS jum NON AN vas YY N Q o s wee e jw La SESS 559 ah WX 1T Next the mesh is smoothed and repl2. HP UX UNIX HP Itanium 2 HP UX IBN p eU SOLARIS UNIX DEC TRUEUNIX sca nist thai d ptite omues AIX Windows 86 32 Windows 2000 XP Vista Windows 86 64 Windows 2000 XP Vista Licensing Annual Licenses An Annual License is a lease of the TrueGrid software for one year The user has access to upgrades and technical support for the duration of the year Perpetual Licenses A Perpetual License gives the right to use TrueGrid software forever The user has the option to pay annual maintenance which gives access to upgrades and technical support for one year This can be renewed every year Network Licenses TrueGrid can be run on any supported computer on your network For each license purchased one instance of TrueGrid can be run on the network When multiple licenses of TrueGrid are purchased for a network then that number of instances can be run simultaneously Additional requests to run TrueGrid will be placed into a queue and TrueGrid will run according to those requests as soon as an instance becomes available Trial Licenses A fully functional free Trial License of TrueGrid is available The Trial License is valid for 60 days and comes with complete documentation and full technical support Contact XYZ Scientific Applications to find out how to receive a Trial License Upgrades and Maintenance
3. by XYZ Scientific Applications Inc Mesh Generator and Pre Processor for FEA and CFD Analysis Trademarks are registered trademarks of Dassault Systems CADDS is a trademark and Pro ENGINEER is a registered trademark of PTC ANSYS AUTODYN and FLUENT are registered trademarks of ANSYS Inc TASCflow is a registered trademark of Advanced Scientific Computing Ltd NASTRAN is a registered trademark of NASA MSC NASTRAN and PATRAN are registered trademarks MSC Software Corporation Solid Edge is a registered trademark Siemens Corporation NX is a trademark or registered trademark of Siemens Product Lifecycle Management Software Inc LS DYNAY is a registered trademark Livermore Software Technology Corporation Windows is a registered trademark of Microsoft Corporation SolidWorks is a registered trademark of Dassault Systems SolidWorks Corporation SurfCam CAD CAM is a registered trademark of Surfware Inc Sun and Solaris are registered trademarks of Sun Microsystems Inc FIDAP is a trademark of Fluent Inc STAR CD is a registered trademark of CD adapco Unix is a registered trademark of X Open Company Limited IBM and AIX are trademarks or registered trademarks of IBM Corporation is a registered trademark of Hewlett Packard is a trademark of Sony Corporation Intel and Itanium are registered trademarks of Intel Corporation Red Hat is a registered trademark of Red Hat
4. Inc Apple is a registered trademark of Apple Inc AMD and Opteron are trademarks of Advanced Micro Devices Inc SUSE is a trade mark of NOVELL Inc LINUX is a registered trademark owned by Linus Torvalds All other brand product service and feature names or trademarks are the property of their respective owners The TrueGrid Advantage TrueGrid software is advanced meshing technology for FEA and CFD simulation codes TrueGrid s unique approach to mesh generation saves time and produces quality near orthogonal elements Even complex models are meshed to superior quality The Projection Method TrueGrid meshes are formed more quickly and easily using the projection method The projection method takes the menial tasks out of capturing geometric features in the mesh Multi Block Structures TrueGrid uses a multi block approach to mesh generation Block structured hex meshes produce the highest quality meshes ensuring accurate results Multi block structures minimize the effort of constructing complex models No Geometry Clean Up TrueGrid faithfully imports CAD CAM and solids model surfaces and there is no need for geometry clean up You can import your CAD CAM or Solids Model in the standard IGES format and save time and frustration because your IGES surfaces will be flawless Parametric and Scripting Capabilities TrueGrid is both an interactive and batch mesh generator In batch mode you can edit the scripting file
5. Maintenance is sold on an annual basis for a Perpetual License in order to receive upgrades and technical support You can download the newest version of TrueGrid over the internet or request an upgrade DVD to be mailed to Documentation All documentation is available in electronic format The TrueGrid User s Manual TrueGrid Examples Manual and TrueGrid Tutorial can all be accessed over the internet These manuals contain over 1 000 colored diagrams and examples Documentation is easily downloaded or you can request a hard copy to be mailed to you If you would like more information about TrueGrid you can contact XYZ to receive free colored brochure with detailed information Request a Quotation To receive a quote or to purchase any of the licenses or documentation discussed above please contact us at XYZ Scientific Applications Inc 1324 Concannon Blvd Livermore CA 94550 Phone 925 373 0628 Fax 925 373 6326 www truegrid com e mail info truegrid com TrueGrid by XYZ Scientific Ine D JJ A dL z a Ii a 5 HN Lu About XYZ Scientific Applications Inc XYZ Scientific Applications Inc 1s dedicated to developing advanced meshing tools for FEA and CFD analysis XYZ began development of its flagship product TrueGrid in 1991 and continues to make technological advances to the software In addition to developing TrueGrid
6. XYZ also uses TrueGrid for mesh generation consulting services
7. ka Ht cct 1 7774 UT ree Ud The projection method automatically finds the intersection of these two surfaces and places boundary nodes along that intersection This geometry is composed of two different surfaces that do not meet A mesh line is required at the intersection of the surfaces TrueGrid Combines Surfaces In addition to cleaning up the geometry TrueGrid also saves time by combining surfaces Combining surfaces is desirable so that a single face of your mesh can cover many surfaces Instead of building 100 meshes from 100 surfaces form the union of the 100 surfaces in TrueGrid 1 command and project the mesh to this union 1 more command Cap Geometry with Many Surfaces The helical thread in the cap is considered difficult to model with hex elements Each color represents a different surface Creating a mesh using each individual surface would be impossible Close Up of Fillet The filleted areas are commonly decomposed as shown Just the single tab is composed of 16 surfaces It is critical to be able to combine such surfaces into one to avoid spending too much time on a small feature a ll li Hi 11 j I 4l LAT TY e E T H 5 E Easily Meshed
8. surfaces to form composites Surfaces by algebraic functions General transformations and normal offsets can be applied to the geometry Import CAD CAM and Solids Models TrueGrid imports trimmed surfaces and other geometry in the standard IGES format Some of the CAD CAM and solids modelers supported by the TrueGrid IGES reader include ANSYS CATIA CADDS NX ICEM DDN Pro Engineer SolidEdge SolidWorks Surfcam CAD CAM Import Polygon Data Import STL files and other polygon data files in ASCII or Binary format Import Existing Meshes from Several Formats Including DYNA3D LS DYNA MSC NASTRAN PATRAN Neutral File to create quality hex meshes in a minimal amount of time The example below s to create a quality hex mesh with only 13 commands in 4 steps Creating a Mesh in TrueGrid illustrates the methods used in TrueGrid TrueGrid gives users the tools I Beam Example py ts O S 5 5 5 SS A 2 9 O ae M eb z S T E C EB ELELITITITTTTITI EE B Se E i d C Q NI 5 Ba 95 E B a m D D G yj ae A HZ 3 LO st e a ci NO a 22E oN dod 2 0 Q VA c o T O Oo Oo S5 5 2 5 n 5b EE EE un c S 5 c Ne O 5 u 5 S N gt aR 8 E ux Q G S D nS ut
9. to produce a parametric mesh Save time by creating one quality parametric model to produce many variations Pre Processing TrueGrid is a complete preprocessor for the simulation codes that it supports TrueGrid will write the entire input deck for a simulation code The pre processing tool in TrueGrid makes it possible to take advantage of the advanced features available in the simulation code Geometry Library TrueGrid has built in geometry library so users can create their own geometry or add surfaces to geometry already imported from other files The Projection Method TrueGrid meshes are shaped by projecting faces of the mesh onto surfaces This is known as the projection method The projection method makes it possible for TrueGrid to faithfully conform the mesh to any geometry The Projection Method is Quick and Easy To use the projection method specify the region of the mesh select the surface to project to then click on the Project button and that s it The projection method makes this Intersecting Pipes example easy Step 1 Create the Geometry The first step is to define the geometry or import it from a CAD CAM system or polygon data file These surfaces were created in TrueGrid using two sd commands sd i Gy 0 0 0 0 0 1 2 SOL 2 Cy Qo i5 ad 5 Step 2 Build the Topology Next a crude approximation of the mesh 1s constructed First the block command 15 used to build the topology Next dei co
10. The number of replications for each part was different so careful planning was needed to make sure that the nodes at the interface between the two parts matched perfectly Biomechanical Applications uas The projection method ensures that small features in biomechanical data captured in the details of the e mesh The geometry for this bone was extracted from a CAT scan The data was imported to TrueGrid and the mesh projected to polygon surfaces Elliptic smoothing algorithms were applied to give a smooth mesh while faithfully preserving the shape of the femur TrueGrid supports multi block structured meshes Multi block means that the block topology be made from multiply connected blocks Each block 1s composed of 3D hexahedral or 2D quadrilateral linear or quadratic elements arranged 1 rows columns and layers These blocks can be moved deleted replicated or glued to other blocks or parts Multi blocks Save Time The main advantage ofthe multi block structured mesh is efficiency Blocks start out pre connected When a vertex edge or face common to several blocks 15 moved or shaped you only have to take the appropriate steps once If you were using single block technology you would have to take these steps once for every block that shares the same vertex edge or face This 1s evident in the construction of a sphere A multi block part 1s used to design a Multi block Structure butterf
11. d the session file becomes a template to automatically generate meshes for an entire class of problems Parametric Features Include Variables and arrays Algebraic expressions The creation of parametric curves and surfaces The definition and use of functions Global mesh density calculations Local mesh density calculations Inclusion of sub meshes using the include command Conditional execution of commands Repetition of a group of commands in a loop The substitution of CAD geometry The 1f statement Iterative functions User defined functions Built in TrueGrid construction functions Redesigned Features with Parameters Parameters can be used instead of numbers for specific design features For this impeller model one of the parameter values designates the number of blades in the mesh It took only seconds to change the parameter and generate a new model SSS 6b ade odie 9 blade impeller 12 blade impeller Use Parameters to Change Mesh Density You can edit the block or cylinder commands in the scripting file to make changes to your mesh The node numbers in the cylinder command are modified to change the mesh density in one region of this strut cylinder cylinder 12 67 8 L 10 IL 12 1 5 amp 6 10 Lo S0 1907 13467 9 c 10 XE Wes Use Parameters to Change the Design of a Model Parameters can be used for specific design variables to easily redesign a model The leng
12. h s M WY A Y LP NY TEUAN AAN IN QL WAIHI SSS TIS IIA HSS Wr N AS i MSS VI S S SSNS This complex model was broken into 177 parts then glued together to create a high quality mesh Each color represents a different part Zooming in on the mesh shows that the parts match perfectly Replicate Parts to Make Assemblies Easier This part was created in TrueGrid using a multi block structure of 9 blocks The center was deleted and the faces projected The part was replicated using one command to form the entire ring L ze TT PEERS L 2 FHHHHEEERHEHHHI al The block boundary interface command provides the tools to assemble models with many parts and materials This side impact dummy SID was created using several parts consisting of multiple layers The mesh is based on NHTSA design drawings and outer surface scan data The images below show the different layers used to construct c O c O D d c un 3 H I f E 1 D D A LZ mT v S M S c LU l A d 1 lt E 2 E D en ka ec Crash test models provided courtesy of Liver
13. icated to complete the model rele 2 U 5320 0 1 lot 2 my 22 my 44 rep 0 L 2 Ye Step 5 Parameterize the Mesh Although the I Beam is complete it may be necessary to make a parametric version in order to quickly run variations of the model To do this the session file is modified with the following parameter statements These parameters are integrated into the block command and any where else they are called XL 5 c radius of the fillets p 3b thickness of the web Bn I c thickness of the plates wb 10 c width of the web pll Les c width of the plates r2 _ c radius of holes hg c gap between holes d 1 5 c mesh density The following variations of the I Beam were quickly generated by editing a parameter statement in the scripting file and rerunning TrueGrid Export Options Exports to FEA Simulation Codes ABAQUS ALE3D ANSYS AUTODYN DYNA3D ES3D MARC SAMI EXODUS II MSC NASTRAN SAP 2000 GEMINI NE1 NASTRAN TOPAZ3D ICFEP NIKE3D LS DYNA PATRAN Neutral File Exports to CFD Simulation Codes CF3D CFX4 CFX5 FIDAP FLUENT PLOT3D at FSU GILA PLOT3D at NASA GRIDGEN3D STAR CD KIVA 4 TASCflow TrueGrid Availability Platform Operating System Apple Mac Intel CPU OSX Apple Mac Motorola CPU OSX LINUX X00 92 EN ole Red Hat LINUX 86 64 SUSE LINUX Itanium 2 Red Hat SUSE UNIX HP
14. ly topology to quickly achieve the best quality design for this problem SARACENEN LLALA A 27 block multi block part is created The faces of the mesh are projected to the surface of a sphere and smoothing algorithms used to evenly distribute the nodes j L This sphere was formed in four easy steps in TrueGrid One half and one quarter view of the sphere shows the quality design Quality is Maintained Throughout the Design Large models are easier to manage using multi block structured parts Users have control over the design of the topology and can plan for assemblies of many parts This approach also ensures that quality hex elements are maintained throughout the model Piston and Rod This piston and rod was easy to create because of the multi block structured approach This model has 9 parts and some of the parts where formed from many blocks ii 1 LES Piston and Rod Interior EE By slicing the model in half it 1s clear TL that quality is maintained throughout This would not be possible without using multi block structured parts 2E ETE ES EE E Parametric and Scripting Capabilities TrueGrid is both an interactive and batch mesh generator A scripting or session file is automatically generated during an interactive session This scripting file can be edited so arguments to any command can be substituted with a parametric expression an
15. mmands are used to delete unneeded regions Then tr command is used to move the mesh into place Finally the command is used to force equal spacing of the nodes along the edges plock slo 9 17 Al SA 2 ec qo dei 23 1 0 4 des L Ze U de 2 23 o d 2 D 3 4 der L 0 dei 23 120 3 4 2 0 3 Lr 9 Ll 1 9 4 4 ry 295 Iz 23 res 214244531 res 2112 41j1 res 111144j1 Step 3 Project the Mesh Project the faces of the mesh to the appropriate surface of the geometry This requires 2 commands STIL 2 o 3 2 37 Sd 2 Sra ed sew Notice that the edges of the mesh that are common to both pipes are automatically placed at the intersection TrueGrid Versatility SN 2 COA N N vs ey As Fluid Applications NS NN 22 A The projection method can be used to construct boundary layers for fluid flow around objects The faces of the fluid around this impeller are NN shown to illustrate the nodal distribution of the i WI A NN MS 5 fluid mesh N ii i M V Structural Applications The projection method works great for assembling 3 SN bos n complex structures This hub was formed using two parts Each part was formed by projecting a small portion of the N POON mesh and then replicating those regions to form the entire part
16. more Software Technology Corporation www lstc com Transition Elements The transitional block boundary command is a command for gluing parts with dissimilar element counts TrueGrid can automatically transition hexahedral or quadrilateral meshes across block boundary interfaces using only hexahedral or quadrilateral elements respectively A row of hex quad shell elements at the interface are automatically replaced with a row that sews the two parts together to produce a node for node edge for edge and face for face matching across the interface Using Transitional Elements Transition Between Dissimilar Parts If the number of elements in one part is 1 2 or 1 3 of the number of elements in another part then a transitional block boundary is needed The transition layer can be used to sew together parts with a different number of elements in both directions Transition Mesh Density Transitional layers can be used to change mesh density The mesh to the left has three transitions in two directions with a transition scale factor of 12 in each direction Use Transitions to Fill Irregular Regions Transitions can be used with wedge elements to fill irregular regions where a complex solution may be needed Transition Elements for Complex Models Complex models are often not consistent in the number of elements from part to part Transitional elements may be needed at every level to match parts of a complex model Sp
17. oke This model has many different layers dm which require different mesh density Transition element are used to match the parts Loud Speaker The parts of this loud speaker were glued together with transitional elements that were automatically generated so that the interfaces between parts match perfectly Pre Processing Capabilities Loads and Conditions TrucGrid display pressure Oat 2 800E 03 e Initial and prescribed displacements qu e Prescribed nodal rotations oe M N WA e Prescribed nodal velocities e Prescribed nodal accelerations 2X e Concentrated and distributed nodal loads Momentum deposition SAN Pressure PON Bulk fluid e pu Convection pau AA o Thermal and electric prescribed flux Ne MOK Initial and prescribed temperature ANSEHEN OOK e Radiation and radiation enclosure TSS zii x Heat generation y ee EN e Magnetic and electrostatic potential 5 Constraints and Boundary Conditions With structures a node can have a reduced set of degrees of freedom With fluids there are various boundary conditions such as an inlet an outlet or a wall just to name a few The list of possible boundary types 15 different for each fluids code Contacts and Interfaces Some structural codes have a contact surface feature In many cases two opposing regions of the mesh must be identified Also these contact surface
18. s have characteristics that must be identified Properties and Element Types Most simulation codes have a set of properties associated with each material model These material model properties and the associated element types can be selected Then elements are assigned a material model This can be done by either selecting a region in the part phase or by assigning the material model to an element set Analysis Options In order to run a simulation using a model from TrueGrid one must first identify the analysis options and other global properties of the model Many of these options can be selected within TrueGrid so that the final output file from TrueGrid can be imported to the simulation code without modification and run Geometry TrueGrid Geometry Library Use the TrueGrid Geometry Library to build your own geometry Geometry surfaces include Planes spheres cylinders ellipsoids cones and tori 2D and 3D lines polygonal curves and arcs 2D and 3D cubic spline and NURBS curves 2D and 3D curves by algebraic functions 3D curves composed of edges of surfaces 3D curves from the intersection of surfaces Curves projected onto surfaces Concatenation of any set of 3D curves Curves of interpolation Lofted curves Surface edges and contours Surfaces of revolution Ruled swept and pipe surfaces Surfaces blended from 3 or 4 curves Cubic spline and NURBS surfaces Mesh and polygon surfaces including STL Combination of
19. th of this collector inlet lmseq J 3 nn dom d 2 1 5 4 2 model is quickly changed with two parameters xcxd4 sT The parameters for this change are found on the following lines 4 2 EU ESTE EEH S LTT CX S ELE SKS REAR Sx p S i NS SSS LETT Le HIA T7 ATL 5558 SS ae LTT gi Parameters effecting length increased Parameters effecting length set to zero parameter nn 20 c number of nodes St 2 c scale factor parameter nn 0 c number of nodes sf 0 c scale factor No Geometry Clean Up Every CAD system and solids modeler has a tolerance when the surfaces are written to an IGES file This can cause surfaces to have gaps or overlaps With TrueGrid no time is spent perfecting geometry imported from a CAD CAM or solids modeler because the projection method automatically ignores surface boundaries gaps and overlaps and finds the intersection of surfaces even when they do not quite meet Create a Smooth Mesh Across Many Surfaces The surfaces are combined into one surface and the projection ignores the surface boundaries gaps and overlaps to create a smooth mesh across the geometry This geometry is representative of a typical IGES file with geometry composed of several surfaces that may have gaps and overlaps Automatically Place Mesh Lines at the Intersection of Surfaces EF T u T r ji a Fa
20. with Combined Surfaces f In TrueGrid a block mesh is projected to the combined surfaces and the problem is easily solved The result is a quality mesh that was quick and easy to generate i T i J I IS Ill Ill Assemblies TrueGrid s assembly features helps to achieve a quality mesh for complex models A face of one part can be glued to the face of another part using the block boundary interface command Parts are easily replicated to form complex assemblies from simple components Glue Parts Together Using Block Boundaries 5 SS SN NN NN CASS SS A SKAN gt NN NN SS MY ANS KRR WE SS SS 7 E ES 62 SENS ES ss 4y 17 LET T 777 ZILK T LULLA 7777 at ALL ZZZ L7 a SUSAN Se L7 77 2 SSSR Se LLG SSSR SSS PS LLLLL ESSET I ELL 27 f ih 2 CG 2 57 77 Iw S Ws 2 Uy f 2 SSSSS IRR OLI 25 2 PALF 77 SLO c 22 LI f ji 7777 7 5 2 Z 2 S 4 2 LQ 2 OR iw ORR WX ERS V LY My 27 e 277 LEE 7 Z 2 22 LS AN LWW TN CUS SINAN SSZ AIS S NN 2 LEO 2 SOL fy LLLP Le L7 LA Z Ay L7 L7 L7 1H LE LD J
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