You can provide additional parameters via the /ATTR,VALUE line in the .IST file. Supported parameters are CSYS and DTYP. Issue a CSYS,VALUE command to specify the coordinate system to be used for the subsequent data supplied in your .IST file. The default coordinate system is the global Cartesian system. You can apply initial strain in a similar manner by including /DTYP,EPEL before the actual initial-state/initial- strain date. For example, /dtyp,epel all,all,all,all, 0.1, 0, 0, 0, 0, 0 applies an initial strain of ex = 0.1 for all elements in the database. You can insert comments and other non-analysis information in the .IST file by preceding them with an exclamation mark (!). 4.5. Using Coordinate Systems with Initial State The INISTATE command provides options for specifying data in coordinate systems other than the material and element coordinate systems. To define the coordinate system, issue this command: INISTATE,SET,CSYS,CSID Valid values for CSID are MAT (material) or ELEM (element), or any user-created coordinate system. Shell elements support only material and element coordinate systems. Link elements support only element coordinate systems. The default coordinate systems are 0 (global Cartesian) for solid elements, and ELEM for shell, beam and link elements. 4.6. Example Problems Using Initial State This section provides examples of typical initial state problems, as follows: 4.6.1. Example: Initial Stress Problem Using the IST File 4.6.2. Example: Initial Stress Problem Using the INISTATE Command 4.6.3. Example: Initial Strain Problem Using the INISTATE Command 4.6.4. Example: Initial Plastic Strain Problem Using the INISTATE Command 4.6.1. Example: Initial Stress Problem Using the IST File The following example initial stress problem shows how to define an initial stress file and use the INISTATE,READ command to read the data into your analysis. The following file contains the initial stresses to be read into ANSYS. Each element has eight integration points in the domain of the element. /CSYS,0 ! ELEM ID ELEM INTG LAY/CELL SECT INTG SX SY SZ SXY SYZ SXZ 1 , 1, , , 100, 0, 0, 0, 0, 0 1 , 2, , , 100, 0, 0, 0, 0, 0 1 , 3, , , 100, 0, 0, 0, 0, 0 1 , 4, , , 100, 0, 0, 0, 0, 0 1 , 5, , , 100, 0, 0, 0, 0, 0 1 , 6, , , 100, 0, 0, 0, 0, 0 1 , 7, , , 100, 0, 0, 0, 0, 0 1 , 8, , , 100, 0, 0, 0, 0, 0 91 Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 4.6.1. Example: Initial Stress Problem Using the IST File In the following input listing, initial stress loading data is read in from a file. The data is read in during the first load step, and establishes a preliminary deflection corresponding to a tip loaded cantilever beam with a tip load of 1e5 units. /prep7 /title, Example of Initial stress import into ANSYS et,1,182 ! Plane stress PLANE182 element mp,ex,1,1.0e9 mp,nuxy,1,0.3 ! ! Define the nodes ! n,1 n,2,2.0 n,3,4.0 n,4,6.0 n,5,8.0 n,6,10.0 n,7,,1.0 n,8,2.0,1.0 n,9,4.0,1.0 n,10,6.0,1.0 n,11,8.0,1.0 n,12,10.0,1.0 ! ! Define the 5 elements ! e,1,2,8,7 e,2,3,9,8 e,3,4,10,9 e,4,5,11,10 e,5,6,12,11 ! Constrain all dofs on all nodes at x=0 to be zero nsel,s,loc,x, d,all,all nall finish ! /solu ! Read in the initial stresses from istress.ist file ! as loading in the 1st load step. ! Input stresses correspond to the element integration ! point location. ! inis,read,istress,ist ! List the initial stresses inis,list outres,all,all solve finish ! /post1 set,last prnsol,u finish The INISTATE,WRITE command specifies the coordinate system into which the data is to be written. 4.6.2. Example: Initial Stress Problem Using the INISTATE Command You can apply constant stresses to all selected elements by issuing a INISTATE,DEFI,ALL command. The INISTATE command can also delete stress from individual elements after the stress is applied. The INISTATE,LIST command lists the applied stresses. The following input listing shows how these commands are used. Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 92 Chapter 4: Initial State solution ! ! Apply a constant state of the initial stresses. ! inis,defi,all,,,,1322.34,2022.21,302.43,4040.32,5076.32,6021.456 ! ! Verify the applied stresses then delete those of element #1 ! inis,list inis,dele, 1 ! ! Set the boundary conditions and then solve ! inis,list solve finish 4.6.3. Example: Initial Strain Problem Using the INISTATE Command This example initial strain problem is a simple uniaxial test. A displacement of 0.05 is applied to this single element. An additional 0.05 initial strain is applied. The calculated results include the effects of both initial strain field and the applied displacement. delta = 0.05 ndiv=1 /prep7 ! Define the material mp,ex,1,20E3 mp,nuxy,1,0.3 mp,dens,1,7850 ! kg/m3 et,1,185 BLOCK,0,1,0,1,0,1 lesize,all,,,ndiv vmesh,all,all fini /solu nsel,s,loc,x d,all,ux nsel,s,loc,y d,all,uy nsel,s,loc,z d,all,uz inis,set,dtyp,epel inis,defi,,,,,0.05, nsel,s,loc,x,1 d,all,ux,delta allsel,all solve /post1 set,last presol,s presol,epto presol,epel finish 4.6.4. Example: Initial Plastic Strain Problem Using the INISTATE Command This initial plastic strain example is a simple 3-D problem where the cross section has three layers. An initial plastic strain and stress are applied to one of the layers. One end of the block (shaped like a beam) is fixed 93 Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 4.6.4. Example: Initial Plastic Strain Problem Using the INISTATE Command and the stresses are allowed to redistribute. The following input listing shows how to apply initial plastic strain to one layer within a cross section and check the redistributed stresses. /prep7 et,1,185,,2,1 keyopt,1,8,1 ! store data for all layers (can be excessive) mp, ex, 11, 20.0e6 ! psi (lbf/in^2) mp, prxy, 11, 0.25 ! unitless mp, ex, 12, 20.0e6 ! psi (lbf/in^2) mp, prxy, 12, 0.25 ! unitless mp, ex, 13, 20.0e6 ! psi (lbf/in^2) mp, prxy, 13, 0.25 ! unitless ! MISO material model tb,miso,11,,3 tbpt,define,5e-5,1e3 tbpt,define,0.010,1e3 tbpt,define,0.600,1e3 ! BISO material model tb,biso,12,,1 tbdata,define,100,100000 ! Plastic material model tb,plas,13,,7,miso tbpt,,0.0000,30000 tbpt,,4.00e-3,32000 tbpt,,8.10e-3,33800 tbpt,,1.25e-2,35000 tbpt,,2.18e-2,36500 tbpt,,3.10e-2,38000 tbpt,,4.05e-2,39000 sectype,1,shell,,my3ply ! 3-ply laminate secdata, 0.30, 11, , 3 ! 1st layer THICK, MAT, ANG, Int. Pts. secdata, 0.30, 12, , 3 ! 2nd layer THICK, MAT, ANG, Int. Pts. secdata, 0.30, 13, , 3 ! 3rd layer THICK, MAT, ANG, Int. Pts. ! align esys with the global system block,0,1,0,0.1,0,0.1 type,1 secnum,1 esize,0.1 vmesh,1 finish /solu antype,static outres,all,all ! Uniaxial State Initial plastic Strain. inis,set,mat,13 inis,set,dtyp,eppl inis,defi,all,all,all,all,0.1,,, inis,set,dtyp,stress inis,define,all,all,all,all,1000 inis,set,dtyp,, /out inis,list,all /out,scratch Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 94 Chapter 4: Initial State nsel,s,loc,x,0 d,all,all,0.0 ! Fix one end solve save finish /post1 set,last esel,s,elem,,1 /out /com /com, Expected result: You should see newly redistributed stresses and strains in /com, all layers /com layer,1 presol,s,comp presol,eppl,comp layer,2 presol,s,comp presol,eppl,comp layer,3 presol,s,comp presol,eppl,comp finish 4.7.Writing Initial State Values Issue an INISTATE,WRITE command (available in the solution processor only) to write a set of initial state values to a file. You can issue the command multiple times to modify or overwrite your initial state values. 4.7.1. Example: Output From the INISTATE Command's WRITE Option The initial stress file written by the INISTATE,WRITE command has the same format as that of the input file. The stresses in the file are those calculated at the integration points when the convergence occurs in a nonlinear analysis. If the analysis type is linear, the stresses are those calculated when the solution is finished. An example initial stress file resulting from this command follows: !*********************************** INITIAL STRESS FILE ************************* !*********************************** t.ist ************************* !*********************************** HEADER INFORMATION ************************* /ETYP,DEFA /COLINF,ELEM,ELIN,,,SX,SY,SZ,SXY,SYZ,SXZ /ETYP,LAYE /COLINF,ELEM,ELIN,LAYE,SECT,SX,SY,SZ,SXY,SYZ,SXZ /ETYP,BEAM /COLINF,ELEM,ELIN,CELL,SECT,SX,SY,SZ,SXY,SYZ,SXZ !**************************** INITIAL STRESS DATA ******************************** !ELEM ID ELEM INTG LAY/CELL SECT INTG SX SY SZ SXY SYZ SXZ /csys,0 1, 1, 1, 1, -3.50063 , -23.2768 , 0.00000 , -2.04204 1, 2, 1, 1, 3.50063 , 0.607255E-01, 0.0000 , -2.04204 1, 3, 1, 1, 3.50063 , 0.607255E-01, 0.00000 , 2.04204 1, 4, 1, 1, -3.50063 , -23.2768 , 0.00000 , 2.04204 /csys,0 2, 1, 1, 1, 0.791614 , 5.26355 , 0.00000 , 0.461775 2, 2, 1, 1, -0.791614 , -0.138827E-01, 0.00000 , 0.461775 2, 3, 1, 1, -0.791614 , -0.138827E-01, 0.00000 , -0.461775 2, 4, 1, 1, 0.791614 , 5.26355 , 0.00000 , -0.461775 /csys,0 95 Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 4.7.1. Example: Output From the INISTATE Command's WRITE Option 3, 1, 1, 1, -0.179107 , -1.19024 , 0.00000 , -0.104479 3, 2, 1, 1, 0.179107 , 0.380702E-02, 0.00000 , -0.104479 3, 3, 1, 1, 0.179107 , 0.380702E-02, 0.00000 , 0.104479 3, 4, 1, 1, -0.179107 , -1.19024 , 0.00000 , 0.104479 /csys,0 4, 1, 1, 1, 0.409451E-01, 0.269154 , 0.00000 , 0.238847E-01 4, 2, 1, 1, -0.409451E-01, -0.381382E-02, 0.00000 , 0.238847E-01 4, 3, 1, 1, -0.409451E-01, -0.381382E-02, 0.00000 , -0.238847E-01 4, 4, 1, 1, 0.409451E-01, 0.269154 , 0.00000 , -0.238847E-01 /csys,0 5, 1, 1, 1, -0.112228E-01, -0.608972E-01, 0.00000 , -0.654661E-02 5, 2, 1, 1, 0.112228E-01, 0.139211E-01, 0.00000 , -0.654661E-02 5, 3, 1, 1, 0.112228E-01, 0.139211E-01, 0.00000 , 0.654661E-02 5, 4, 1, 1, -0.112228E-01, -0.608972E-01, 0.00000 , 0.654661E-02 Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 96 Chapter 4: Initial State Chapter 5: Solution In the solution phase of an analysis, the computer takes over and solves the simultaneous set of equations that the finite element method generates. The results of the solution are: • Nodal degree of freedom values, which form the primary solution • Derived values, which form the element solution. The element solution is usually calculated at the elements' integration points. The ANSYS program writes the results to the database as well as to the results file (.RST, .RTH, .RMG, or .RFL files). The following solution topics are available: 5.1. Selecting a Solver 5.2.Types of Solvers 5.3. Solver Memory and Performance 5.4. Using Special Solution Controls for Certain Types of Structural Analyses 5.5. Using the PGR File to Store Data for Postprocessing 5.6. Obtaining the Solution 5.7. Solving Multiple Load Steps 5.8.Terminating a Running Job 5.9. Restarting an Analysis 5.10. Exercising Partial Solution Steps 5.11. Singularities 5.12. Stopping Solution After Matrix Assembly 5.1. Selecting a Solver Several methods of solving the system of simultaneous equations are available in the ANSYS program: sparse direct solution, Preconditioned Conjugate Gradient (PCG) solution, Jacobi Conjugate Gradient (JCG) solution, Incomplete Cholesky Conjugate Gradient (ICCG) solution, Quasi-Minimal Residual (QMR) solution, and an automatic iterative solver option (ITER). In addition, the Algebraic Multigrid (AMG) solver as well as distributed versions of the PCG, JCG, and Sparse solvers are available for use in Distributed ANSYS (refer to the Distributed ANSYS Guide). See the EQSLV command description for details on each solver, defaults, etc. You can select a solver using one of the following: Command(s): EQSLV GUI: Main Menu> Preprocessor> Loads> Analysis Type> Analysis Options Main Menu> Solution> Load Step Options> Sol'n Control ( : Sol'n Options Tab) Main Menu> Solution> Analysis Options Main Menu> Solution> Unabridged Menu> Analysis Options 97 Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. The following table provides general guidelines you may find useful in selecting which solver to use for a given problem. MDOF indicates million degrees of freedom. Table 5.1 Solver Selection Guidelines Disk (I/O) Use Memory UseIdeal Model Size Typical ApplicationsSolver 10 GB/MDOF 1 GB/MDOF (optimal out- 10,000 to 1,000,000 When robustness and solution speed are required (nonlinear ana- Sparse Dir- ect Solver of-core); 10DOFs (workslysis); for linear analysis where iterat-(direct elim- GB/MDOF (in- core) well outside this range). ive solvers are slow to converge (especially for ill-conditioned ination, shared- matrices, such as poorly shaped elements). memory par- allel solver) 0.5 GB/MDOF 0.3 GB/MDOF w/MSAVE,ON; 50,000 to 10,000,000+ DOFs Reduces disk I/O requirement relat- ive to sparse solver. Best for large models with solid elements and fine PCG Solver (iterative solver) 1 GB/MDOF meshes. Most robust iterative solver in ANSYS without MSAVE 0.5 GB/MDOF 0.5 GB/MDOF50,000 to 10,000,000+ DOFs Best for single field problems - (thermal, magnetics, acoustics, and multiphysics). Uses a fast but simple JCG Solver (iterative solver) preconditioner with minimal memory requirement. Not as robust as PCG solver. 0.5 GB/MDOF 1.5 GB/MDOF50,000 to 1,000,000+ DOFs More sophisticated preconditioner than JCG. Best for more difficult problems where JCG fails, such as unsymmetric thermal analyses. ICCG Solver (iterative solver) 0.5 GB/MDOF 1.5 GB/MDOF50,000 to 1,000,000+ DOFs High-frequency electromagnetics.QMR Solver (iterative solver) 0.5 GB/MDOF 1.5-2.0 GB/MDOF in total* 50,000 to 100,000,000+ DOFs Same as PCG but runs on distrib- uted parallel systems. DPCG Solver (distributed solver) 0.5 GB/MDOF 0.5 GB/MDOF50,000 to 10,000,000+ DOFs Same as JCG but runs on distributed parallel systems. Not as robust as DPCG or PCG solver. DJCG Solver (distributed solver) 0.5 GB/MDOF 1.5-3.0 GB/MDOF in total* 50,000 to 1,000,000+ DOFs Good shared memory parallel per- formance. Good preconditioner for ill-conditioned problems where PCG is slow. AMG Solver (iterative solver) 10 GB/MDOF 1.5 GB/MDOF on master 10,000 to 5,000,000 Same as sparse solver but runs on distributed parallel systems. DSPARSE Solver (dis- machine, 1.0DOFs. Workstributed sparse) GB/MDOF onwell outside this range. slave ma- chines. Uses more total Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 98 Chapter 5: Solution Disk (I/O) Use Memory UseIdeal Model Size Typical ApplicationsSolver memory than the sparse solver. * In total means the sum of all processors. Note To use more than 2 processors, the distributed and AMG solvers require ANSYS Mechanical HPC licenses. For detailed information on the AMG solver, see Using Shared-Memory ANSYS in the Advanced Analysis Techniques Guide. For information on the distributed solvers, see the Distributed ANSYS Guide. 5.2.Types of Solvers 5.2.1.The Sparse Direct Solver The sparse direct solver (including the Block Lanczos method for modal and buckling analyses) is based on a direct elimination of equations, as opposed to iterative solvers, where the solution is obtained through an iterative process that successively refines an initial guess to a solution that is within an acceptable tolerance of the exact solution. Direct elimination requires the factorization of an initial very sparse linear system of equations into a lower triangular matrix followed by forward and backward substitution using this triangular system. The space required for the lower triangular matrix factors is typically much more than the initial assembled sparse matrix, hence the large disk or in-core memory requirements for direct methods. Sparse direct solvers seek to minimize the cost of factorizing the matrix as well as the size of the factor using sophisticated equation reordering strategies. Iterative solvers do not require a matrix factorization and typ- ically iterate towards the solution using a series of very sparse matrix-vector multiplications along with a preconditioning step, both of which require less memory and time per iteration than direct factorization. However, convergence of iterative methods is not guaranteed and the number of iterations required to reach an acceptable solution may be so large that direct methods are faster in some cases. Because the sparse direct solver is based on direct elimination, poorly conditioned matrices do not pose any difficulty in producing a solution (although accuracy may be compromised). Direct factorization methods will always give an answer if the equation system is not singular. When the system is close to singular, the solver can usually give a solution (although you will need to verify the accuracy). The ANSYS sparse solver can run completely in memory (also known as in-core) if sufficient memory is available. The sparse solver can also run efficiently by using a balance of memory and disk usage (also known as out-of-core). The out-of-core mode typically requires about the same memory usage as the PCG solver (~1 GB per million DOFs) and requires a large disk file to store the factorized matrix (~10 GB per million DOFs). The amount of I/O required for a typical static analysis is three times the size of the matrix factorization. Running the solver factorization in-core (completely in memory) for modal/buckling runs can save significant amounts of wall (elapsed) time because modal/buckling analyses require several factorizations (typically 2 - 4) and repeated forward/backward substitutions (10 - 40+ block solves are typical). The same effect can often be seen with nonlinear or transient runs which also have repeated factor/solve steps. 99 Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 5.2.1.The Sparse Direct Solver The BCSOPTION command allows you to choose a memory strategy for the sparse solver. The available options for the Memory_Option field are DEFAULT, INCORE, OPTIMAL, MINIMUM, and FORCE. Depending on the availability of memory on the system, each memory strategy has its benefits. For systems with a large amount of physical memory, the INCORE memory mode often results in the best performance. Conversely, the MINIMUM memory mode often gives the worst solver performance and, therefore, is only recommended if the other memory options will not work due to limited memory resources. In most cases you should use the DEFAULT memory mode. In this mode, the ANSYS sparse solver uses sophisticated memory usage heuristics to balance available memory with the specific memory requirements of the sparse solver for each job. By default, most smaller jobs will automatically run in the INCORE memory mode, but larger jobs may run in the INCORE memory mode or in the OPTIMAL memory mode. In some cases you may want to explicitly set the sparse solver memory mode or memory allocation size using the BCSOPTION command. However, doing so is only recommended if you know how much physical memory is on the system and understand the sparse solver memory requirements for the job in question. When the sparse solver is selected in Distributed ANSYS, the distributed sparse solver is automatically used instead. See The Distributed Direct (DSPARSE) Solver (p. 103) for details. 5.2.2.The Preconditioned Conjugate Gradient (PCG) Solver The PCG solver starts with element matrix formulation. Instead of factoring the global matrix, the PCG solver assembles the full global stiffness matrix and calculates the DOF solution by iterating to convergence (starting with an initial guess solution for all DOFs). The PCG solver uses a proprietary preconditioner that is material property and element-dependent. • The PCG solver is usually about 4 to 10 times faster than the JCG solver for structural solid elements and about 10 times faster then JCG for shell elements. Savings increase with the problem size. • The PCG solver usually requires approximately twice as much memory as the JCG solver because it retains two matrices in memory: – The preconditioner, which is almost the same size as the stiffness matrix – The symmetric, nonzero part of the stiffness matrix You can use the /RUNST command (Main Menu> Run-Time Stats), to determine the memory needed, or use Table 5.1: Solver Selection Guidelines (p. 98) as a general memory guideline. This solver is available only for static or steady-state analyses and transient analyses, or for PCG Lanczos modal analyses. The PCG solver performs well on most static analyses and certain nonlinear analyses. It is valid for elements with symmetric, sparse, definite or indefinite matrices. Contact analyses that use penalty- based or penalty and augmented Lagrangian-based methods work well with the PCG solver as long as contact does not generate rigid body motions throughout the nonlinear iterations (for example, full loss of contact). However, Lagrange-formulation contact methods and incompressible u-P formulations cannot be used by the PCG solver and require the sparse solver. Because they take fewer iterations to converge, well-conditioned models perform better than ill-conditioned models when using the PCG solver. Ill-conditioning often occurs in models containing elongated elements (i.e., elements with high aspect ratios) or contact elements. To determine if your model is ill-conditioned, view the Jobname.PCS file to see the number of PCG iterations needed to reach a converged solution. Generally, static or full transient solutions that require more than 1500 PCG iterations are considered to be ill-conditioned for the PCG solver. When the model is very ill-conditioned (e.g., over 3000 iterations are needed for convergence) a direct solver may be the best choice unless you need to use an iterative solver due to memory or disk space limitations. Release 12.0 - © 2009 SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 100 Chapter 5: Solution [...]... additional information, refer to the following: • Online help for the Solution Controls dialog box • "Structural Static Analysis" in the Structural Analysis Guide • "Transient Dynamic Analysis" in the Structural Analysis Guide • "Nonlinear Structural Analysis" in the Structural Analysis Guide 5.5 Using the PGR File to Store Data for Postprocessing In many analyses, a large amount of preliminary graphics... Shared-Memory ANSYS" in the Advanced Analysis Techniques Guide or the Distributed ANSYS Guide for more information on using ANSYS' parallel processing capabilities 5.3.2 Using ANSYS' Large Memory Capabilities with the Sparse Solver If you run on a 64- bit workstation or server with at least 8 GB of memory and you use the sparse solver, you can take advantage of ANSYS' large memory capabilities The biggest performance... an Analysis Occasionally, you may need to restart an analysis after the initial run has been completed For example, you may want to add more load steps to the analysis These may be additional loading conditions in a linear static analysis or additional portions of a time-history loading curve in a transient analysis Or, you may need to recover from a convergence failure in a nonlinear analysis ANSYS. .. for the analysis type you select All variants of the abridged Solution menu contain an Unabridged Menu option This option is always available for you to select in case you prefer using the unabridged menu If you do one analysis and then choose to do a new analysis within the same ANSYS session, ANSYS will (by default) present you with the same type of Solution menu that you used for the first analysis. .. (such as for a transient analysis) 8 Continue the procedure as outlined in Restarting an Analysis (p 118) 5.9.2 Multiframe Restart If you are performing a nonlinear static or full transient structural analysis, or a static or transient thermal or thermal-structural analysis, ANSYS by default sets up the parameters for a multiframe restart Multiframe restart allows you to save analysis information at... to restart an analysis with old and new parameters /title, Multiframe Restart with Tabular Load /prep7 1 24 Release 12.0 - © 2009 SAS IP, Inc All rights reserved - Contains proprietary and confidential information of ANSYS, Inc and its subsidiaries and affiliates 5.9.2 Multiframe Restart et,1 ,42 ! Build model n,1,0.0,0.0 n,2,0.0,0.5 n,3,0.0,1.0 n ,4, 1.0,0.0 n,5,1.0,0.5 n,6,1.0,1.0 e, 1 ,4, 5,2 e, 2,5,6,3... static analysis and then select a new buckling analysis, ANSYS presents you with the unabridged Solution menu that is appropriate for buckling analyses However, you can toggle between the unabridged and abridged Solution menus at any time during the solution phase of the analysis by selecting the appropriate menu option (Main Menu> Solution> Unabridged Menu or Main Menu> Solution> Abridged Menu) 5 .4. 2... big memory systems is system configuration You will always see the best ANSYS performance with processor/memory configurations that maximize the memory per node An 8-processor, 64 GB system is much more powerful for large memory jobs than a 32-processor 64 GB system ANSYS cannot effectively use 32 processors for one job but can use 64 GB very effectively to increase the size of models and reduce solution... the upper bound on the largest contiguous block of memory you can get on your system 1 Open a command window and type: ansys1 20 -m 1200 -db 64 2 106 If that command successfully launches ANSYS, close ANSYS and repeat the above command, increasing the -m value by 50 each time, until ANSYS issues an error message that it has insufficient memory and fails to start Be sure to specify the same -db value... following contact elements: CONTA171, CONTA172, CONTA173, CONTA1 74, CONTA175, CONTA176, CONTA177 5.9.1.2 Singleframe Restart Procedure If you are performing a mode-superposition transient analysis, ANSYS sets up the parameters for a singleframe restart by default The procedure for performing the restart analysis is as follows: 1 Enter the ANSYS program and specify the same jobname that was used in the . 0.00000 , 0.1 044 79 /csys,0 4, 1, 1, 1, 0 .40 945 1E-01, 0.2691 54 , 0.00000 , 0.238 847 E-01 4, 2, 1, 1, -0 .40 945 1E-01, -0.381382E-02, 0.00000 , 0.238 847 E-01 4, 3, 1, 1, -0 .40 945 1E-01, -0.381382E-02,. , -1.190 24 , 0.00000 , -0.1 044 79 3, 2, 1, 1, 0.179107 , 0.380702E-02, 0.00000 , -0.1 044 79 3, 3, 1, 1, 0.179107 , 0.380702E-02, 0.00000 , 0.1 044 79 3, 4, 1, 1, -0.179107 , -1.190 24 , 0.00000. 0.00000 , -2. 042 04 1, 2, 1, 1, 3.50063 , 0.607255E-01, 0.0000 , -2. 042 04 1, 3, 1, 1, 3.50063 , 0.607255E-01, 0.00000 , 2. 042 04 1, 4, 1, 1, -3.50063 , -23.2768 , 0.00000 , 2. 042 04 /csys,0