[giangcoikx]

Dear everyone,

Maybe I ask an old question but I would like to hear your points as an overview.

Currently I am doing on a small turbine research, what I am doing first is to create the turbine geometry from a bunch of coordinates on CATIA. Then I mesh it by ICEM and eventually solve it by CFX.

My question is about the first step. It seems easy and convenient to draw on CATIA, it gives me a good surface quality. However, some experts said that the purpose of CATIA and other CAD softwares is for manufacturing, for this reason, its best tolerance is about 0.001 inches or 0.0254 mm, meanwhile for some turbulence model (which requires y+ around 1 or 0.001 mm), much lower than manufacturing standard. And due to this, there might appears some small wiggles or gaps on intersecting surfaces due to incompatibility that I don't see on CATIA, but might appears when I import it on Pointwise.


The experts suggested me to draw a geometry directly on the meshing software. However, as I understand, is it difficult and time consuming on ICEM when the object has complex geometry like a engine turbine? If not, on the tutorials, which software did Ansys draw it?

My private question, for for personal knowledge, do you think ANSYS ICEM has convenient tools for geometry creating? Please do not bias your company product.

In total, which CAD tools do you often use? How much did you have to adjust geometry again on meshing software, make it mesh-able?

Or should I use other tools like Blade Modeler or TurboGid, because my problem is about turbine. Could you help me review these products? In my workplace, almost no one uses these tools.

Thank you very much for your effort to help me.
I am a newbie so I am confused about the working principles.: D