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Is there an option to use Single Precision on a Sparse Solver?


There is no single precision sparse solver. Also, WE RECOMMEND AGAINST USING THE SINGLE PRECISION PCG SOLVER, EVEN THOUGH IT IS DOCUMENTED. The single precision PCG solver was implemented in the early days of iterative solvers to permit the user to solve large problems without the required memory. The single precision PCG solver stores real numbers as REAL*4 instead of REAL*8 (or Double Precision). Use of the single precision PCG solver can lead to significant round off error which may result in incorrect answers. The question we would ask is "Do you want good answers or will any answer do?" If any answer will do, use the single precision PCG solver. Double precision is the rule in ANSYS and all internal real variables in the ANSYS program are Double Precision. Today, computational horsepower is cheap and users should invest in what is required to solve their problem.

Question:<br><br>Is there an option to use Single Precision on a Sparse Solver?<br><br>Answer:<br><br>There is no single precision sparse solver. Also, WE...

I get an error when going to Hexa which kicks me out:

In the message window back in Mesh editor it reads:
" server opened up 110 but I opened 108"
" error receiving DL_OPEN "

In your .cshrc include this line:<br><br>setenv NO_DL_REMOTE 1<br><br>This prevents Hexa from trying to start another process for the graphics

When installing ANSYS 8.0 for the first time on a SUN Fire
V480 Server, customer gets the following error: /ansys_inc/v80/ansys/bin/usIII/ansys.e80: fatal: /usr/dt/lib/
: wrong ELF class: ELFCLASS32

Customer was running Solaris 8 and SUN OpenGL 1.2.1

What is causing this error?

The customer was getting the above error because they were not using the required version of OpenGL, as documented in the Install Guide for ANSYS 8.0. ANSYS 8.0 requires OpenGL 1.2.3, as well as...

The following error message appears when entering the Material Model portion of the GUI (Main Menu -> Preprocessor -> Materials Props > Material Models)
in ANSYS 8.1 after RESUMing a db file that was created in Release 8.0 of ANSYS:

Unknown entity label ( DMPR ) on the *GET command.
Line= *GET, _UIQR, DMPR, 1, EXIS,

What causes this behavior?

This is reported as defect number 22453 in ANSYS 8.1. It is currently being investigated. The workaround is to do a CDWRITE in ANSYS 8.1, restart 8.1, and then issue a CDREAD. Another option is...

Customer running ANSYS 8.0 on Windows XP gets the following error in his output:

*** fatal error no. -202 *** subroutine xdslor encountered i/o error
on i/o file no. 20

*** ERROR *** CP= 63.094 TIME= 16:39:15
Input/Output error on unit= 20. Possible full disk.

The customer had 21GB free disk space.

What is causing this error?

This was a defect that only seemed to happen on the PC platform, and only seemed to occur when the -m setting was relatively large. In 8.0, in the ordering phase we write/read the .LN20 file with...

Q. I have a license on a machine mac1 for 1xBuild, 2xSolver,1XPost,1XPre
and a license on another machine mac2 (on the same network) for 1XBuild. This license is served from mac2.

How can a user on mac2 use the Build license cut for mac2 but also the solver license cut for mac1?

A. Set the system variable LM_LICENSE_FILE on mac3 to be license1.dat:license2.dat, where license1.dat and license2.dat are both in the Licensing directory on mac2 and where license1.dat is the license file for the daemon running on mac2 and license2.dat is the license file copied from mac1.
To do this:
Let's say that you have stored the two license files in the directory /usr/local/license

1. First try typing the command in your terminal window:

setenv LM_LICENSE_FILE /usr/local/license/license1.dat:/usr/local/license/license2.dat

2. If the above works, then you can set the variable permanently in a file called ~/.cfx/5.6/cfx5rc

Q. I have a license on a machine mac1 for 1xBuild, 2xSolver,1XPost,1XPre<br>and a license on another machine mac2 (on the same network) for 1XBuild. This license is served from...

It appears that there are some problems in the current viscoelastic model (ANSYS v.61-v8.1), that could be confusing to ANSYS users.

(1) For TB,Prony input, the data can be entered at different temperatures. I believe that the Prony constants are a function of reference temperature instead of temperature. Because, under each reference, the Prony pairs are obtained based on the master curve which is generated by time-temperature superposition based on modulus-frequency curves at different temperature. Therefore, Prony pairs has already considered different temperature. Why does the design of the Prony Table include different temperature again? I believe that will certainly confuse users.

(2) For the Shift function, there should be only one group C1, C2 and Tref input. However, if you use a different Tref, the C1, C2 should be different and should generate a shift factor A(T) that is quite different. What is the significance of a different Tref?

Your statements are certainly true IF the viscoelastic material is thermorheologically simple (TRS). But TRS is not a requirement for the TB,PRONY version of ANSYS viscoelasticity. It is...

What do I need to know to merge prism meshes?

If you want to merge prism grids, make sure you create the prisms BEFORE you merge, because prism will not allow an input mesh to have hexas or pyramids (which are created by merging tetras to...

Is ANSYS Workbench 8.1 supported on the HP Superdome Itanium 64-bit chip with HP-UX11i?

Workbench is not supported under the HP Itanium 64-bit chip with HP-UX11i, and there are no current plans to support it in the near future.

Does ANSYS/CFX support the Spaceball 5000?

No, ANSYS CFX does not support the use of the Spaceball at this time.

Does ICEM CFD support the Spaceball 5000?

No, ICEM CFD does not support the use of the Spaceball at this time.<br>It should be supported in release 5.0, available in May 2004, however, this is not 100% confirmed.

How can a user customize the ANSYS 8.1 Workbench RSS Headlines and Messages that are displayed on the Project Page?

The following information describes how the Workbench RSS Headlines and Messages system works.<br><br><br>1. Workbench Settings:<br><br>Workbench > Tools...

Customer trying to start Workbench 8.1 (DesignModeler and CFX-Mesh) on Multilanguage PC reports the following error:

Ansys.WBU.exe - Fehler in Anwendung Die Anweisung in "0x77a9efb" verweist auf Speicher in "0x00000000". Der Vorgang "read" konnte nicht auf dem Speicher durchgeführt werden. Klicken Sie auf "OK", um das Programm zu beenden. Klicken Sie auf "Abbrechen" um das Programm zu debuggen. OK Cancel

As a workaround on German windows system, renaming the C:WINNTMUIFallback directory works fine. However, at the customer multi-language installation, this causes severe problems because other software-packages can not be installed/un-installed after removal of the Fallback directory (Start --> Settings --> Control Panel --> Add/Remove Programs does not appear!).

This is defect # 21586 and it has been resolved.<br><br>Either Windows 2000 SP4 or installing Internet Explorer 6 causes the problem.<br>The Windows Script Host, (WSH), is...

On an ITANIUM HP Workstation (HP UX 11.22) the file.LN09 file will not grow above 2GB. The rst file can grow above 2GB.
The user has large files enabled on the file system.
The following error is in the output file:

*** fatal error no. -505 ***
subroutine xdslfa encountered i/o error on word addressable i/o file no.9

What is causing the ln09 file not to pass 2GB?

There was an issue with fortran I/O in an early version of HP UX 11.22, which was later fixed, whereby it wouldn't write/read large files. To fix this problem, have the user download and...

Q. Why is the memory available for solver, as recorded in the output, so much lower then the difference between the user defined total workspace memory and db memory?

A. The low available memory for solver is related to /PREP7 functions performed prior to solve, like meshing, that will consume virtual memory and not release it. One workaround, if memory is an issue, is to save the db after all the /PREP7 functions are complete and then FINISH,/CLEAR, RESUME, file,db. This should show a higher available memory for solver. Exiting ANSYS and re-entering just prior to executing the solve will maximize available memory.

Q. Why is the memory available for solver, as recorded in the output, so much lower then the difference between the user defined total workspace memory and db memory?<br><br>A. The ...

Why if I am using the GUI to apply pressure loads in either ANSYS Release 7.1 or ANSYS Release 8.0,
are the pressure loads to elements or nodes not applied correctly.

There are two Class 3 errors that apply to this problem. Class3 2003-17 describes the behavior in Release 7.1<br>which is corrected in Release 8.0 and Class3 2004-06 applies to Release 8.0...


From: John Thompson, ANSYS Technical Support

Date: May 7, 2004

Onyx Solution 319943

Re: USERCREEP Standard Package

Please find attached the initial release of the ANSYS USERCREEP Standard Package. This package is a collection of file that are intended to demonstrate the implementation of an implicit creep equation into ANSYS. Included in the package are:
1. The coding for USERCREEP that is programmed into the production version of ANSYS, usercreep_ansysdefault. This version of implicit creep is identical to the strain hardening law for TBOPT=1.
2. An input file, ansysverif.inp, that demonstrates that TBOPT=1 and TBOPT=100 give the same results.
3. An output file, ansysverif.out, that is the output file from running ansysverif.inp with the standard version of ANSYS.
4. A modified version of USERCREEP, usercreep_statev, that demonstrates the use of STATE variables in an analysis using implicit creep.
5. An input file, statev.inp, for exercising usercreep_statev.
6. A modified version of USERCREEP, usercreep_sterling, that demonstrates the implementation of the Sterling Power equation for creep.
7. A Word document describing the implementation of the Sterling creep law.
8. An input file, sterling.inp, for exercising the Sterling creep law in ANSYS.
9. An output file, sterling.out, that is the output file from running sterling.inp with the Sterling Power creep law in ANSYS.

To include a customize creep law, the user must relink the ANSYS program to include the USERCREEP subroutine. Details for relinking are documented in the Guide to ANSYS User Programmable Features. Implicit user creep is activated by setting TBOPT to 100 on the TB command. This package has been tested for the initial release of ANSYS 8.0. Questions concerning this should be directed to ANSYS Technical Support.

To: ANSYS USERCREEP Programmers<br><br>From: John Thompson, ANSYS Technical Support<br><br>Date: May 7, 2004<br><br>Onyx Solution 319943<br><br>Re:...

Q. What are *.PCG, *.PMA, *.PCF files? They are created with both PCG AND the sparse solvers.

A. The subject files are internal scratch (temp) files that will be deleted when the job is done.
User should not delete them during the time the job is running. Sparse uses a PCG assembler for speed so you might see them with both sparse and PCG solver runs.

Q. What are *.PCG, *.PMA, *.PCF files? They are created with both PCG AND the sparse solvers.<br><br>A. The subject files are internal scratch (temp) files that will be deleted when...

Parts fly apart in Workbench 8.0 with anything other then bonded contact. How do you fix this?

Check the contact status specifications in the solve.out file. If any contact pairs are in initially open status and loads are force based, this is a likely cause of rigid body motion. If using ...

How to apply a load to a portion of a model face (patch load) using ProE Mechanica Simulation features?

The user should take advantage of the Mechanica Simulation Features, which is part of the default ProE installation.<br><br><br>Open this part in ProE<br>Go to Mechanica...

Q. Can you give me some information about CFX-Flo.

A. CFX-Flo is a promotion undertaken by ANSYS at version 8.1 to help customers migrate from FLOTRAN to CFX. Customers request CFX-Flo through the customer portal.

It consists of the basic version of CFX known as BCS along with CFX-Pre and CFX-Post. One task at a time is allowed, and it will use the FLOTRAN license key.

CFX-BCS capabilities, mirror those of FLOTRAN, with the following exceptions: free surface and surface-to-surface radiation are not supported, and CFX does not have 2D capability.

Users can develop models in ANSYS Prep7 and write a CDB file that CFX will read. Boundary condition surfaces are identified by making named components of 2D elements in PREP7. CFX-Pre, where the user will apply boundary conditions, will recognize these surfaces from the CDB file.

Training material including an example will be down-loadable from the Customer Portal.

Q. Can you give me some information about CFX-Flo.<br><br><br>A. CFX-Flo is a promotion undertaken by ANSYS at version 8.1 to help customers migrate from FLOTRAN to CFX. ...


I am attempting to create a shared library for the IBM AIX operating system but this doesn't seem to work. In particular, ANSYS routines dspget, disget and ntpget do not appear to be included in the ANSYS libraries supplied for this system. The coding I am using works well on other platforms (Linux, SunOS, HP-UX) but not on the AIX. Can you help me solve this problem.


You will not be able to use shared libraries on the AIX system. It will be necessary to create a static library and use that static library instead. For the AIX system, ANSYS creates and uses static libraries for the production version of the program because of the difficulty of creating shared objects. The other libraries that ANSYS uses for the production version, such as the Boeing libraries for the sparse solver, are also static libraries on the AIX operating system. The command to create a static library is

ar -X64 rv libraryname.a *.o

You can likely use the gen_share script to create the object files for the library but the .so file created should be discarded.

Question:<br><br>I am attempting to create a shared library for the IBM AIX operating system but this doesn't seem to work. In particular, ANSYS routines dspget, disget and...

When starting WorkBench on a Unix machine, several popup error windows appear.

Line: 23001
Char: 4
Error: Object doesn't support this action
Code: 800a01bd
Source: Microsoft JScript runtime error
Script: var split = gb.isSplit;

What is causing these errors?

Customer should check the install.log file and see if every lib file registered "successful", especially and The install.log file can be found in...

In Simulation at 8.1, I can define a local cylindrical co-ordinate system but I cannot seem to use this for applying loads or displacements. Why is this?

At 8.0 and earlier releases users could only use local co-ordinate systems for post-processing results ¿ both cartesian and cylindrical. For example, radial and hoop stresses could be...

How can I project a set of nodes on to a surface?

Create a coordinate system using the LOCAL command such that its XY plane is the desired surface (the location of the global origin<br>is not important), be sure it is the active coordinate...