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How do you request the .cdb output in ANSYS Workbench?

An operational strength analysis with ANSYS as the source can be carried out by using the following work procedure. Because this file format is no longer generated as the default in newer ANSYS Workbench versions, the following instructions are provided as to how this file can be requested with an additional command in the calculation definition:  

1. Prepare the structural mechanical analysis.

2. Define the file request with a “Commands (APDL)” line in ANSYS Mechanical (see the figure).  

Figure 1: Location of the neeeded commands in ANSYS


3. Double click on the window that opened with “Commands (ADPL)” and enter “CDWRITE, DB C:\[your working directory]\component.cdb”.  

Figure 2: Command for cdb file export


4. The ANSYS calculation generates the file “component.cdb” in the working directory.


Figure 3: Defined ANSYS analysis settings


5. FEMFAT analysis.

What is “on demand” variable licensing and how do you configure it?

Up until the release of version 5.1, the FEMFAT license module retrieved all the necessary and available licenses from the license server unless other settings had been specified manually.

Since the release of FEMFAT 5.1, individual licenses are only retrieved while the server is being used and they are made available again during times of non-use.

In this regard, it is also possible to specify a timeout which defines the time interval of the users inactivity after which the license is once again made available. This has the advantage that other users can use the licenses and therefore, no valuable resources remain unused.

The default value for the timeout is 15 minutes. The “MAGNAECS_LICENSE_TIMEOUT” environment variable allows a value of between 5 and 9999 minutes to be set.

If work with FEMFAT is resumed after the timeout value was exceeded, FEMFAT attempts to retrieve the required licenses once again. If they have already been reassigned, then there are the options of either waiting until a license becomes available or of saving the state of the model temporarily and continuing work at a later point in time. However, FEMFAT will be exited either way. For analyses which are carried out in batch mode, the keyword “-queue” can be used to prevent FEMFAT from aborting the job due to a lack of licenses and writing an entry into the message file. Instead, FEMFAT then waits with the further processing until a sufficient number of licenses are available.

This means that, overall, variable licensing provides significant improvements: Licenses are only blocked as long as they are actually required for an analysis. This increases the utilization capacity of the existing licenses when there are several analysis engineers working with one license pool.