How to Write Calculation Information to a Text File in ANSYS APDL

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Calculation information contains all the information generated by ANSYS software during the calculation process. By accessing this information, we can obtain important characteristics of our model without the need for complicated post-processing. For instance, when using response spectrum analysis, it is necessary to perform modal analysis to determine if the selected number of modes is sufficient. Now, let us suppose the modal quality parameter coefficient should not be less than 90%,  how can we check this in ANSYS?

If you are familiar with Workbench, you can easily access this information by clicking on “Solu Information” in the solution module. Solu Information represents the calculation information of the model, and you can find the modal quality parameter coefficient and the participation factors of each mode by browsing the calculation information, as shown below:

In addition to the above information, users can also check many other parameters, such as the total mass of the model, the total number of elements, and the total number of nodes.

Of course, in  APDL, you can use the *get command to obtain this information. However, this method can be cumbersome, especially if you only need to query the information. Is there a way to obtain this information in ANSYS APDL similar to Workbench? Yes, there is.

The first method is to use the classical output window, which displays all the information generated by the model during the calculation process. However, this window also records all of our operations, such as zooming and clicking, which can make it difficult to find the desired information.

The second method is to output the calculation information to a text file in classical APDL. This can achieve a similar effect to Workbench and makes it easier to find the information we need. To do this, we use the /output command to control the output of the information window.

Here is an example of how to use this method:

/solu
/output,Solu_Information,txt
nsel,s,loc,z,0
d,all,all
allsel,all
antype,modal
modopt,lanb,10
mxpand,10
solve
/output
/post1
set,list

Note that there are two “output” commands in the example above. The first output command must immediately follow the /solu command and specifies the name of the output file. The second output command is used to restore the information to the output window after the solution has been solved. This is done to avoid other operations being output to the file. The output file will be located in the software working directory and will look something like the example below:

Good Luck!

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