The quality of the mesh in the fluid domain is even more important than in the solid parts. The first step is to inspect the CAD model to verify is it is “proper” or not for the FEA analysis:Īfter inspection, several parts contain small edges and faces which may lead to poor mesh. The aspect ratio should be under 8 (aspect ratio is the ratio of the biggest edge on the largest edge of one mesh element). The criteria I usually consider is the simpliest. So, to perform this analysis, I need to mesh the model with very good mesh. The contact between fluid and solid is done using CFD contacts which are quite sensitive to the mesh quality. To perform this type of analysis, I need to analyze solid parts and fluid parts together in CFD. Ive heard that Maestro is good for ship and boat modelling though. This is the CAD model of a LED lamp, and i want to perform a CFD thermal coupled analysis on it. ANSYS is the Universitys preferred platform for FEA as I believe the Civils and Mechanicals like it, and being a smaller department we Naval Archs have to make do. I will give an example to explain more in details the need to simplify the model: If the model used from the beginning is very complex, there is no way to validate and compare results with theory. Even if the relation between Mesh quality and accuracy is not as clear as we usually think ( see this blog post for more info), a poor mesh will lead to poor convergence of the solver and decrease the accuracy of the results.Īnother reason to simplify the CAD model is to get a model more easy to compare with Theory, because theory always considers very simple models. The CAE engineer wants to get accurate results using a solver which converge as fast as possible. – The CAD model may contain small edges, doubled edges or very small faces which make the meshing nearly impossible.
![import cad to ansys 15 import cad to ansys 15](https://docplayer.net/docs-images/46/21697252/images/page_7.jpg)
– The CAD model may be extremely detailed (the dream of the CAD designer and the nightmare of the CAE Engineer), and lead to very complex or impossible meshing.
![import cad to ansys 15 import cad to ansys 15](https://mechanicalbase.com/wp-content/uploads/2021/01/resim_2021-01-18_204139.png)
Unfortunately, all may not go as smoothly as we want… The most simple workflow for FEA analysis is: Why do you need to simplify your model? How can I do that? Today’s subject: CAD model simplification for FEA analysis.