SOLIDWORKS FEA Simulation: Creating a Mesh Quality Check
Creating Mesh in SOLIDWORKS Simulation is much easier with few parameters to control and choosing mesh element is mostly depending on the type of geometry. For example, Long Weldment structures with uniform section can be meshed as Beam Elements, Sheetmetal parts can be meshed as Shell Elements and all the bulky models can be meshed as Solid Elements.
Basically almost all the models can be meshed as the Solid Tetrahedral Elements. It is really important to check the quality of the mesh otherwise the simulation results will be questionable.
How do we know the Mesh Quality when using Solid Elements is good for the model?
There are few ways to check the mesh Quality.
- Mesh layers in the thickness direction:
After creating the Mesh using Solid Elements, Make sure there are at least 2-3 layers of high quality mesh layers across the thickness direction in the model. (Note: We only use Draft Quality to check the boundary conditions and whether the system works as expected. Sometimes Draft Quality. Sometimes Draft Mesh can be used for final calculation so when using Draft mesh, 4-6 layers need to be created in the thickness direction)
- Aspect Ratio Check Plot:
For a solid mesh, numerical accuracy is best achieved by a mesh with uniform perfect tetrahedral elements whose edges are equal in length. For a general geometry, it is not possible to create a mesh of perfect tetrahedral elements. Due to small edges, curved geometry, thin features, and sharp corners, some of the generated elements can have some of their edges much longer than others. When the edges of an element become much different in length, the accuracy of the results deteriorates.
Aspect Ratio is defined as the ratio between the longest distorted edge and the short normal dropped from a vertex to the opposite face normalized with respect to a perfect tetrahedral.
By definition, the aspect ratio of a perfect tetrahedral element is 1.0. The aspect ratio check assumes straight edges connecting the four corner nodes. The aspect ratio check is automatically used by the program to check the quality of the mesh.
Maintain Aspect ratio equal to or more than 1.0 and less than 40.
- Jacobian Check Plot:
Parabolic elements can map curved geometry much more accurately than linear elements of the same size. The mid-side nodes of the boundary edges of an element are placed on the actual geometry of the model. In extremely sharp or curved boundaries, placing the mid-side nodes on the actual geometry can result in generating distorted elements with edges crossing over each other. The Jacobian of an extremely distorted element becomes negative. An element with a negative Jacobian causes the analysis program to stop.
In general Jacobian- Measures the displacement of the mid-side nodes and is available for high quality parabolic elements only and not for draft quality linear element.
Perfect Tetrahedral will have a Jacobian of 1.0. When the element mapped into the curved geometry the distortion of the mid sided node occurs
Maintain Jacobian more than 1.0 and less than 50
How to create the Mesh check plot?
Right Click the mesh folder – Create Mesh Plot and choose Aspect Ratio.
How to achieve the better Mesh Quality?
- Change the Mesh parameters used in the mesh settings
- Apply Mesh control on the local areas.
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