Context: To use the Keywords Editor, you should be familiar with the syntax of Abaqus keywords and data. For example, the Step module does not allow you to provide boundary impedances or nonreflecting boundaries for acoustic and coupled acoustic-structural analysis. To provide boundary impedances or nonreflecting boundaries, you can use the Keywords Editor to add the IMPEDANCE keyword to the model. When you submit the model for analysis in the Job module, Abaqus/CAE incorporates changes you made using the Keywords Editor in the input file that is submitted for analysis. Keywords that you add to your model using the Keywords Editor persist even after you modify or regenerate the model using Abaqus/CAE, because Abaqus/CAE stores the contents of the Keywords Editor along with the model definition in the model database. As a result, the contents of the input file may not be valid (for example, if you added keywords that refer to steps that you subsequently deleted), and the analysis may fail.
Abaqus/CAE indents some of the keywords in the Keywords Editor to make the input file easier to read on the screen. The keywords that are indented can never appear on their own in the input file and must always be used in conjunction with another keyword. The indentation that you see in the Keywords Editor is not included in the input file that is generated by Abaqus/CAE. The Keywords Editor does not allow you to edit the geometry of your model; you must use Abaqus/CAE to make geometry changes. Therefore, the Keywords Editor is available only after you have generated the mesh. If the input file generated by Abaqus/CAE is exceptionally long, the Keywords Editor displays the input file one buffer at a time. You can use the scroll bar to scroll through each buffer and the buttons at the bottom of the editor to display the next or previous buffer. If you use the Keywords Editor to modify the input file and then use Abaqus/CAE to modify the model, Abaqus/CAE merges the changes into the input file. If a conflict arises during the merge, Abaqus/CAE issues a warning message. It is recommended that you not edit keywords that are supported by Abaqus/CAE; for example, you should use the Property module, not the Keywords Editor, to change the properties of a material. This approach maintains consistency between directly supported aspects of a model and those added by the Keywords Editor. If you do edit a keyword using the Keywords Editor and then use Abaqus/CAE to make a change to your model that refers to the same keyword, a conflict will occur. To minimize the length of the input file displayed in the Keywords Editor, Abaqus/CAE hides the data lines for keywords that require a large amount of data, notably NODE, ELEMENT, and DISTRIBUTION. If you modify the line immediately following such keywords in the Keywords Editor, conflicts occur when Abaqus/CAE merges and writes the input file. For tips on resolving input file conflicts generated by the Keywords Editor, see Resolving conflicts in the input file. You can review the keywords supported by Abaqus/CAE by selecting from the main menu bar. |