release notes of nisa version 18 0

NISA Suite of FEA Software

Release Notes

Version 18.0

Cranes Software, Inc.

November 2011 Worldwide Copyright (C) Cranes Software, Inc. All rights reserved.

World Headquarters: Cranes Software, Inc. 1133 E Maple Road, Suite 103 Troy, MI 48083 U.S.A. TEL: (248) 689-0077 FAX: (248) 689-7479

Web URL : http://www.nisasoftware.com FTP : ftp://nisasoftware.com E-mail : [email protected]

http://www.nisasoftware.com/

http://www.nisasoftware.com/downloads.html

mailto:[email protected]

Release Notes Version 18.0

Cranes Software, Inc 3 of 16 October 2011

TABLE OF CONTENTS Page No.

NEW FEATURES............................................................................................................ 4

PRE & POST PROCESSORS ........................................................................................ 4

Pre-Processor in DISPLAY III ..................................................................................... 4

Pre-Processor in DISPLAY IV ..................................................................................... 6

Post-processing in DISPL AY IV ............................................................................................................. 8

FEA TRANSLATORS ..................................................................................................... 9

FE data translation from NASTRAN to NISA II ........................................................... 9

PROCESSORS (SOLVERS) ........................................................................................ 10

NISA II ....................................................................................................................... 10

ADVANCED DYNAMICS ........................................................................................... 10

HEAT III .................................................................................................................... 11

EMAG ....................................................................................................................... 11

ENDURE ................................................................................................................... 11

ERROR CORRECTIONS .............................................................................................. 12

PRE & POST PROCESSORS ...................................................................................... 12

DISPLAY III AND DISPLAY IV ................................................................................. 12

FEA TRANSLATORS ................................................................................................... 13

FE data translation from NASTRAN to NISA ............................................................ 13

FE data translation from NISA II to NASTRAN ......................................................... 14

PROCESSORS (SOLVERS) ........................................................................................ 15

NISA II ....................................................................................................................... 15

FLUID INCOMRESSIBLE ......................................................................................... 15

EMAG ....................................................................................................................... 16

ENDURE SHELL ....................................................................................................... 16



NEW FEATURES

In this section new features and enhancements to the NISA suite are presented.

PRE & POST PROCESSORS

New Features in DISPLAY III and DISPLAY IV modules are explained in the following sections. These developments are enhancements to the pre and post processing capabilities of solver modules NISA II, NISA/DYNAMICS, FLUID, HEAT III and EMAG. This also covers the DISPLAY IV Graphical User Interface enhancements.

Pre-Processor in DISPLAY III

1 Support for newly introduced Kinematic Constraint, weighted average link

element (Rig2link) for multiple master nodes and one slave node.



2 Large Format for Heat III, Fluid-incompressible and EMAG. Now users can use both node number and element numbers up to 8 digits. Previous limitation of 6 digits has been removed.

Restriction of 999,999 nodes and elements is removed. This feature enables the

users to have nodes and elements ID number beyond 999,999 (I6) and up to 99,999,999 (I8).

3. Stress linearization for 2D axi-symmetric element (NKTP=3) is implemented. This

includes radius and curvature of shell effects. 4 Stress linearization report is enhanced for all elements by providing additional

output in standard industry format. Program now reports direct and principle stresses along for membrane, bending, membrane + bending and peak along selected line through the thickness.

5 Database compatibility is provided for new element type - NKTP 31 – Concrete

element.

6 Database compatibility is provided for new Data Group *REINFORCEMENT

7 Database compatibility is provided for new Data Group *RCELEMENT

8 New executive card, DIFF is added to specify the type of groundwater flow. Database compatibility is established to read and write *MATDIFF material card to input files.



Pre-Processor in DISPLAY IV

1. New element type – NKTP 31, concrete element.

Display IV is updated to support new element type NKTP 31, solid element with concrete material model.

2. Reinforcement

This feature is added to model the reinforcement inside the concrete elements.

Reinforcement can be added using grids, nodes, lines or by specifying XYZ co-ordinates (points).

FEM Data Group Reinforcement



3. *RCElement data group

*RCElement data group is used to specify reinforced concrete element. This

feature is added to model the concrete element along with reinforcement.

FEM Elements RCElement

4. Support for newly introduced Kinematic Constraint, weighted average link

element (Rig2link) for multiple master nodes and one slave node.

5. Large Format for Heat III, Fluid-incompressible and EMAG. Now users can use both node number and element numbers up to 8 digits. Previous limitation of 6 digits has been removed. Restriction of 999,999 nodes and elements is removed. This feature enables the users to have nodes and elements ID number beyond 999,999 (I6) and up to 99,999,999 (I8).



Post-Processor in DISPLAY IV 1 Support for post-processing of new concrete element type NKTP 31 is added. 2 Contour plot of crack strain for non-linear static analysis is implemented. 3 History graph can be plotted for Elemental results for non-linear static analysis

for single element.

4 Plotting Crack plane inside a concrete element (NKTP 31) is implemented. 5. Report generation for both pre and post processing is enhanced to automatically

generate HTML and Word document reports. Tools Generate Report 6. Hydraulic head contour plotting is provided for ground flow analysis for HEAT III.



FEA TRANSLATORS

FE data translation from NASTRAN to NISA II

1. Rigid link, RBE3 translation is implemented to convert to newly introduced

Kinematic Constraint, RIG2LINK element in NISA II.

2. Add CBAR orientation defined by a vector

3. Added *VECTOR data group to NISA for CBAR element defined by a vector.



PROCESSORS (SOLVERS) NISA II 1. Introduced Weighted average link element (Rig2link) for multiple master nodes

and one slave node kinematic constraints. 2. Rigid link ID is expanded from 6 to 8 digits. This feature now removes the

limitation of the previous versions.

3. An additional option to define local coordinate system (LCSYS) as option 4. This option will allow users to define the local coordinate system by three nodes in the local Z direction and XZ plane. Addition of this option will allow users to translate data from NASTRAN and maintain the format.

4. Automatically re-arrange rigid link sequence to put rigid links for which master

node will become slave node later, ahead of those rigid links which uses the same node as slave node. This avoids the fatal error during the analysis due to slave node becoming master node in processing of rigid links.

5. Added shell offset feature to thin shell (NKTP=40) for linear analysis. ADVANCED DYNAMICS 1. Floor Response Spectrum with Missing Correction: User can now specify the cutoff frequency in Hertz (CFREQ) to account for

missing mass correction while computing the Floor Response Spectra. This CFREQ value (in Hz.) must be same as the CFREQ (in Hz.) of *EIGOUT card in Eigen value analysis NIS file. If there is no entry of CFREQ in *EIGOUT card, user shall take care to see that all the eigenvalues below this CFREQ value are extracted in Eigen value analysis run. Even otherwise, a restart 2 option is available to activate Eigen run again.



HEATII / III 1. Groundwater Flow Analysis:

Seepage analysis forms an important part of studies related to slope stability,

groundwater contamination control and earth dam design. Engineers are often interested in the direction and the quantity of the flow through porous media.

Analysis of Saturated Groundwater flow equations for flows through porous

media is supported. Problems in 2D (NKTP=2) and 3D (NKTP=4) domains can be solved using this feature. The algebraic solver supported by this feature is PARDISO.

The hydraulic properties of the soil with respect to the fluid phase can be input by

the new material card *MATDIFFUSN. Dirichlet and Neumann boundary conditions can currently be specified.

2. Updated Iterative and Sparse Solver in HEAT II to the latest version of these

solvers. EMAG

1. Large input format (8 digits) for element and node ID.

2. Complex parallel equation solver (complex Pardiso solver) has been implemented in EMAG to speed up solution time for complex problems using multiple core machines.

ENDURE 1. Fast scheme to process fatigue life calculation. With this new scheme time

required for the calculation of fatigue life is reduced by several orders of magnitude for large problems compared to the previous versions.



ERROR CORRECTIONS PRE & POST PROCESSORS DISPLAY III and IV 1. Error in writing *ELEMENT data from the older database files. The value -1 in the

last entry is causing failure in running nisa files in NISA II solver. This is caused by a Partial Fixity feature introduced in Version 17.0 – Fixed.

2. DISPLAY III/IV does not show correct values for beam section force/moment for beam load defined by a vector – Fixed.

3. The results in the beam report are not appropriate for beamloads defined by a vector – Fixed.

4. DISPLAY III/IV is writing only one pressure value for beam elements - Fixed

5. DISPLAY III/IV gives error message and does not plot unaveraged stress contour if the model has beam elements along with other elements – Fixed.

6. DISPLAY IV bug – Plotting elements by property attribute is lost after viewing the model with hidden line mode. (While working in some areas, Elements are plotted painting it using property attribute i.e. "ELE, PAI, PRO" command. Then to get solid view using hidden line on "view hid on" and again while coming back to wire frame mode the elements are plotted in default color. Painting done through property attribute is lost which should be retained.)

7. The direction of Pressure arrow is not correct if pressure is defined using a vector and the pressure value is negative – Fixed.

8. DISPLAY III/IV do not show the correct values for *GROUND datacard – Fixed.

9. In Search operation DISPLAY III/IV gives Partial Fixity data though it is not specified – Fixed.

10. History plot of nodal stress is incorrect for nonlinear transient dynamic analysis both in DISPLAYIII/IV – Fixed.

11. DISPLAY IV hangs when writing a nisa file from an old database file with more number of Property Ids – Fixed. Read an old database file with more number of property Ids. Add another

property. Write a nisa file. Display hangs. The size of the nisa file keeps on



increasing up to 2GB. If the file is opened we find RCTABLE data having junk

values throughout the file. No other card is written after the *RCTABLE data

group.

12. In Search operation of *CELEMENTS, Master and Slave surface ids are inter changed in both DISPLAY III /IV – Fixed.

13. DISPLAY IV does not plot contour for strain energy, if strain energy is selected first – Fixed.

FEA TRANSLATORS

FE Data Translation from NASTRAN to NISA II 1. If NASTRAN input file in free format does not have a comma after the last entry

then program could cause errors in the translated NISA input file - Fixed.

2. Element connectivity was incorrect for the shell elements CQUAD8 and CTRIA6 elements – Fixed.

3. Application of Force and Moment is no longer limited to basic coordinate system and can now be applied in different user defined coordinate system – Fixed.

4. Incorrect rotated coordinate system definition has been corrected - Fixed. If NASTRAN uses a third point to define local system, then the translator will use a third point to define local coordinate system in NISA II as well.

5. Rearranged sequence of rigid link definitions to avoid slave node becoming a master node in the subsequent rigid link definition.

6. Correct CBAR translation. It used to put only the first two values defined in the PBAR card to RCTABLE data group in NISA II.

7. Incorrect Real Constant Table RCTABLE number might be given to general type of elements such as shell and solid.

8. If local displacement systems are specified on the GRID data and only displacement data used that local system than program used to crashed – Fixed.



FE Data Translation from NISA II to NASTRAN 1. Rotated coordinate systems for displacement were not written to output file

2. Shear modulus should be put in as blank not 0.0 if it is not defined.

3. Scale factor should be put as 1.0 instead of 1in force card.

4. My and Mz were put as Mx in moment card.

5. The same continuation flags were used for all continuation cards.

6. PLOAD4 was not written for solid elements and the sign for shell element was

incorrect.

7. Nodal coordinates were written more than 8 digits in standard format input file.



PROCESSORS (SOLVERS)

NISA II 1. Nonlinear triangle shell element (NKTP=40) was giving incorrect results and

diverged in material analysis even though problem was still in the linear range.

2. Incorrect answer in the sparse matrix solver or Pardiso solver when in the specified displacement data group same degree of freedom at a node was specified nonzero value in the one load case and was specified as zero value in the next load case – Fixed.

3. Reactions output was not provided at the constrained master node of the rigid links – Fixed.

4. Incorrect stress resultants were given for composite shell element (NKTP=32) in nonlinear analysis - Fixed.

5. Program crashed in the error indicator calculation in windows x64 bit version – Fixed.

6. Incorrect results were provided in the nonlinear transient dynamic analysis when model had composite shell elements (NKTP=32) – Fixed..

7. Incorrect results in the eigenvalue analysis if the shell elements (NKTP=20) had shell offset specified – Fixed.

8. Eigenvalue calculation might crash if both shell offset and lumped mass were used at the same time – Fixed.

9. Incorrect stresses were calculated for shell elements with shell offset – Fixed.

10. More than 5 digits element number could were not printed correctly in fatal error message of some Jacobian calculation – Fixed.

FLUID INOMPRESSIBLE 1. Pardiso solver crashed in turbulence flow calculation – Fixed.

2. Secondary read (*READ) did not work correctly in the large format data groups –

Fixed.

3. Incorrect CPU time value was printed for the solution time if Pardiso, Sparse or CASI Iterative solvers were used – Fixed.



EMAG 1. Program crashed due to stack overflow with large node ID – Fixed.

2. Sparse and Pardiso solvers could not be used for analysis TD3D - Fixed. ENDURE SHELL 1. Stress file name in crack initiation was taken incorrectly. It always wrote

test26.dat in the *end file instead of the user specified file name – Fixed.

release notes of nisa version 18 0

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