Quality of the element is very important criteria , in FEA pre-processing. Higher the qulaity of the mesh, we can get reliable results given that you have given perfect boundary conditions.
At the same time, we should also consider the memory limitation of the computers available with us. So , we should optimize the FE model equally considering the cost of the solving and accuracy that is needed.
Understanding Element Quality Checks
Quality checks measure different aspects of an element's deviation from an ideal size and shape. That ideal shape depends upon the element type.You can choose one or more checks and set threshold values, or limits for deviation, for each. You can perform these checks on shell and solid elements.
There are several ways to check your mesh. You can use:
- Auto Mesh Checking to have the software
automatically evaluate aspects of element quality while it generates a
mesh
- Element Quality Checks to set quality
threshold values and evaluate element quality once you've generated a mesh
- The various element quality icons and menu commands,
such as Coincident Nodes or Coincident Elements, to run
individual quality checks
After you've checked the mesh, you can generate statistical data on element quality or create a result set and display the elements in Post Processing. You can also filter the selection of elements from the results of these mesh checks.
Understanding Quality Threshold Values
Quality
Check
|
Threshold1
|
Threshold2
|
Quad Shell
|
Tri Shell
|
Solid
|
Linear
|
Parabolic
|
Cubic
|
Skew
|
(>) 0-360
|
-
|
X
|
X
|
-
|
X
|
SX
|
SX
|
Warp
|
(>) 0-180
|
-
|
X
|
-
|
-
|
X
|
LMX
|
LMX
|
Taper
|
(>) 0-1
|
-
|
X
|
-
|
-
|
X
|
LMX
|
LMX
|
Aspect
Ratio
|
(>) 0-100
|
-
|
X
|
X
|
X
|
X
|
LX
|
LX
|
Distortion
|
(<) 0-1
|
-
|
X
|
X
|
X
|
SX
|
SX
|
-
|
Stretch
|
(<) 0-1
|
-
|
X
|
X
|
X
|
X
|
SX
|
LX
|
Jacobian
|
(<) 0-inf
|
-
|
X
|
X
|
X
|
SX
|
SX
|
|
Element
Size
|
(<) 0-inf
|
(>) 0-inf
|
X
|
X
|
X
|
X
|
LX
|
LX
|
Quad Included Angles
|
(<) 0-90
|
(>) 90-180
|
X
|
X
|
X
|
X
|
SX
|
SX
|
Tri Included Angles
|
(<) 0-60
|
(>) 60-180
|
X
|
X
|
X
|
X
|
SX
|
SX
|
Using Automatic Mesh Checking
This form also lets you control whether mesh smoothing is turned on for meshes that contain linear or parabolic tetrahedrons. Mesh smoothing improves stretch and distortion.