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help thesis catia-cfd

  • Thread starter Thread starter senzapadroni
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senzapadroni

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hello to all, I have to make a thesis on the processes necessary to make a geometry elaborated in caia suitable for an analysis in cfd.
I should establish which simplifications and additions (e.g. external domain definitions) can be made

Thank you.
 
hello to all, I have to make a thesis on the processes necessary to make a geometry elaborated in caia suitable for an analysis in cfd.
I should establish which simplifications and additions (e.g. external domain definitions) can be made

Thank you.
You should be more precise, otherwise the only way to help you would be to do the thesis for you. In theory, a thesis serves to develop expertise and experience, it is not only a " obstacle" to be overcome somehow before obtaining a diploma.

Obviously nothing personal, in case of a little more "consonant" questions and a more useful contribution to the forum (maybe posting an application case in which you were struggling) we will be happy to help you.
 
the problem is that I don't have a model on which to try, I have a good experience with catia and other modeling software but having never used cfd software I have no idea what might be the main problems that can arise from importing 3d models...
I do not know whether the major problems arise from the form (e.g. edges, high-range fittings or other) or are due to the mesh characters (form, tolerance...) or whether it is better to use elements of surface or volume


ps..scusa for the double post I didn't know which section was suitable
 
the problem is that I don't have a model on which to try, I have a good experience with catia and other modeling software but having never used cfd software I have no idea what might be the main problems that can arise from importing 3d models...
I do not know whether the major problems arise from the form (e.g. edges, high-range fittings or other) or are due to the mesh characters (form, tolerance...) or whether it is better to use elements of surface or volume


ps..scusa for the double post I didn't know which section was suitable
for the little experience I have.... I can tell you, you enable visualization with subdivision of surfaces. If you see that there are in one area for example two adjacent surfaces with very different sizes (but one is very thin, the other is extended), it can be the case that you have defined a very small fitting and you can eliminate it by making a living edge that area. Of course, this must be done in common. you can not eliminate fittings that in some way serve and contribute (e.g. fittings that avoid the carving effect if one is doing a structural analysis instead of cfd), but you can eliminate all those fittings (0.5-1mm, etc.) that are there not to make a living edge geometry, but from the point of view of the calculation do not give particular significant contributions, instead you mess only the meshing.
Consider that the meshatura must be as regular as possible. So having two adjacent surfaces that have very different dimensions between them will constrain you to have strong discontinuity, i.e. finite elements that on one surface have a certain size, on the other they have a very different one and that inficiates quite the results of the calculation. the mesh must be as regular as possible. . .
other tips do not know so on two feet, this is one of the most basic surely. if you get more specific questions try to ask.

Bye.
 

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