- CAE reduces the potential for design errors.
- Users avoid over-engineering because they can immediately see whether changes to the product design affect performance, so they can decide early on whether it is worth continuing development or whether they should drop the design version after the first simulations.
- The effect of changing some parameters on the product can be investigated.
- All this leads to CAE helping to reduce a product`s cost and time-to-market.
The difference between CAD und CAE is the meshing process.
So let`s get back to the key point: What is the difference between CAD und CAE? At first glance, the models of CAD und CAE software look almost the same. On closer inspection, however, it becomes apparent that they are fundamentally different. Both have the shape of the product, but mathematically they don`t have much in common.
There are several ways to combine geometric elements into a 3D geometry. Most likely, CAD models are designed as a collection of volumes or bodies with parameters such as the density of the actual material. The model widely used for CAD modeling is a parametric model with a deign history. This has the advantage that the features can be changed afterwards, so that 3D objects can be created as a combination of geometric shapes with parameters.
In a CAE environment, the CAD model is transformed into a mesh during post-processing. The mesh consists of either cubes, cuboids or tetrahedra, usually polygon meshes. Therefore it is legitimate to compare a CAD model with a vector graphic, while a CAE model can be called a pixelated model.
Calculation and post-processing.
This clearly shows that a CAD model cannot simply be converted into a CAE model. Modeling Spheres, for example, will be a problem for you. This is not possible for volumes with corners, but if the individual volumes of the mesh are small enough, it can be a good approximation.
After the post-processing is complete, the calculation starts. This varies depending on the problem to be solved and the type of simulation, such as finite element analysis, numerical fluid mechanics, of thermal analysis.
The engineer will want to simplify the CAD model because it will not be possible to achieve a perfect result due to the lack of computing power. In contrast, an engineer using a CAD model will want to create a perfect representation of the model he has in mind. The approximations that are made are very accurate.