ME458 FEM - L4 - Practical Considerations
ME458 FEM - L4 - Practical Considerations
ME458 FEM - L4 - Practical Considerations
in Modelling
Dr. Aamir Mubashar
Learning Objectives
• In many cases, as
the aspect ratio
increases, the
inaccuracy of the
solution increases
• Note that there
are exceptions to
this generalization
Aspect Ratio and Element Shapes
• General rules
• Try to maintain low aspect ratios
• Use corner angles of quadrilaterals near 90° when choosing
elements for a model
• Below are elements with shapes that should generally
be avoided
Use of Symmetry / Antisymmetry
X
Use of Antisymmetry
X
Use of Symmetry
• The boundary
conditions must be
idealized to fit the
assumption of
infinite medium
Connecting (Mixing) Different Kinds of
Elements