Error MessageCannot open results file for write access


After running several iterations, the solution stops and one of the following error messages appears:

Error: Cannot open scalar results file for write access <filename>.gls_

Error: Cannot open vector results file for write access <filename>.glv_




During every iteration, the Solver writes data files to the disk that are read by the User Interface. Some of these files contain graphical data for the run-time results display. Others update the output files such as the Status and Solver files.


These messages mean that the Solver was unable to write to the .gls_ or the .glv_ file. These contain the run-time scalar and vector results data that is displayed during the analysis.

There are several potential causes and solutions for this error:

  • This could be due permissions on the directory. Ensure that you have write privileges to the folder that contains the analysis.
  • The file may be in use by another process. Make sure that another instance of this same analysis is already running.
  • The hard drive could be full. Check the amount of available disk space on the drive containing the analysis.
    Check firewall and security software to ensure that Autodesk® Simulation CFD can write to the folder containing the analysis.
  • Check your virus software. Some virus protection systems block a process that tries to open and close files too often or too quickly. This is because many viruses operate this way. The problem is that through an analysis, Autodesk® Simulation CFD opens and closes several files as it updates them with new results. Modify your virus software to allow full access for cfdesign.exe, cfdcalc.exe, mesher.exe, and cfdserv.exe.
  • Check to make sure that any backup software is not trying to back up the analysis at the same time it is trying to solve.
  • Try closing the User Interface after the job starts and see if the solver still has trouble writing to this file.


Simulation CFD