Patran Post Processing: Quick Plot vs Fringe

[sushi75]

Hi!

I'm using Patran to post process results with Nastran, and there is something that I cannot figure out. The user has the option to display the results with Quick Plot, which uses default values. Otherwise to get more precise results, the Fringe option is selected, and the analyst can choose more specific entites.

What confuses me is that it seems that Quick Plot option provides less accurate results than Fringe, so I don't really understand what the benefit of this option really is.

Perhaps I missed a point, so any help on this quiery would be more than welcome!!

Thanks in advance,

Cheers,

Tom

 

[JBlack68]

I do not believe there is such thing as "more accurate results". Patran post processes the raw data the way you asked it to do. Fringe plot gives you control of the averaging & extrapolating method. Other minor options are available but these are the main ones. If you turn off all the averaging then you'll see that the "numbers" correspond exactly to the one in the .f06 file. After that it's a matter of deciding on the best/most appropriate averaging & extrapolation method. I do not re-call the last time I use Quick Plot!

 

[MrFEMcredible]

Quick Plot produces nice smoothy curves to impress the project manager in the quickest time possible and make him think you're on schedule ! :O)
As has been said above,Quick plot is s quick because defaults are used. You should see quickly if there are clear discontinuities in the results field which mean you should (maybe) re-mesh locally, etc..... or if you can go ahead confidently and process in more detail with fringe.

 

[stressebookllc]

Quick plot or fringe, or center max or no averaging are all different options to display the results as they are from the .f06 file (using unaveraged max center values for example) or a fringe plot would extrapolate the values from the center values or the interpolation point values (within the element) to the nodes of the element based on the shape function extrapolation. So it is important to look at both and look at what the stress field is doing. Averaging and fringing may sometimes hide severe discontinuities, you do not want that.

http://www.stressebook.com

Stressing Stresslessly!