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Typical warning message from LUSAS Solver text output file (*.OUT):

***WARNING*** ELEMENT NUMBER P LOCATION OF MIDSIDE NODE Q CAUSES EXCESSIVE SIDE CURVATURE (KLGEOM PROCESSOR)


This is typically caused where the mesh is too coarse in an area of a model meshed with quadratic order elements of triangular or pentahedral shape. It typically indicates the use of a poorly defined mesh. 

By nature, all FE analysis is an approximation, a "model" of a real (or potentially real) object. The results will be more accurate if the mesh is defined in such a way as to simulate the geometry and change in load effects across the structure more effectively. More about mesh refinement

You need to control the number of divisions on the boundaries of surface features so that you obtain elements which are more regular in shape. This can be done as described in the Help menu item:

Help Topics > Modeller user manual > Building a model > Attributes > Meshing and element selection > Meshing a model

The midside node of higher order elements must be equidistant from the end nodes. The reason for the presence of such a check in LUSAS is related to both the evaluation of the Jacobian matrix as well as the general issues of element quality.

Midside nodes may be automatically corrected for some elements with global translational midside node freedoms using Solver Option 49. The mid-side node is moved along the existing element edge until it is positioned centrally.

How to find the target Node or Element:

Solver error or warning messages are also scanned from Solver .out file and reported in Modeller Text Output window. By default the Text Output window appears at the bottom of the graphics window just above the Status Bar. This displays messages and warnings during a modelling session. Specific objects referred to in error and diagnostic messages in the text window by ID number in the form "Element P" may be identified using the identify object dialog. The Identify Object" dialog is invoked by double clicking on the message text. From this dialog the identified object may be selected, moved to the centre of the screen, scaled to fill the screen, have its properties displayed, or identified by an annotation arrow or a temporary indicator.

Element P can also be located in the model using Advanced Selection, activated by right- clicking with the mouse in the graphics window, or via:

Edit > Advanced Selection

 


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Any modelling, design and analysis capabilities described are dependent upon the LUSAS software product, version and option in use.