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2D NACA 6412 Tutorial Extrusion Problem

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Old   May 18, 2014, 05:36
Default 2D NACA 6412 Tutorial Extrusion Problem
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siw
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Stuart
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Hi,

Just got Pointwise application and I am starting with the tutorials, the first is the 2D NACA 6412 tutorial. I'm working through this and when I extrude the aerofoil mesh in the normal direction I do not get the same as in the tutorial guide. I've attached two images of the extrusion (XY-plane and YZ-plane, it's a bit small but we're limited to 800x600 pixels for attached images).

I have double checked that I did not make a mistake and I have watched the Pointwise YouTube video on this and I am doing the same operations as instructed. So why is this happening? It's not a good way so start with a new application as I'm looking to move to Pointwise from ICEM.

Thanks
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File Type: jpg 2.JPG (56.8 KB, 47 views)
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Old   May 18, 2014, 10:17
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HI siw,

It's not easy for me to tell what's the matter from the pictures you posted.
I think you can pay attention to the "Orientation" setting step.
In this step you should first make sure you view in X-Y plane.
Then click "Set Plane" to make the orientation in X-Y plane.
If the vector point inside you need to click the "Flip" button.
Hope this helps, or you can send the ".pw" file to me .
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Old   May 21, 2014, 02:12
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I worked only in the XY plane and only rotated it to make these images. I aslo made sure I flipped the extrusion direction arrows so that they pointed away from the aerofoil. Because the file upload size here is very small I cannot even uploaded the zipped *.pw file as it's over the 97.7 kB limit. I ran through this tutorial 2 or 3 times now and the same thing keeps happening.
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Old   June 1, 2014, 17:30
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Hi Stuart:

I can't tell either from your images what the nature of the problem is. My suggestion is to contact our tech support engineers at support@pointwise.com.
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Old   June 9, 2014, 21:24
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Hi, Siw

I also met the same problem when I extruded the connectors for a 2d mesh. Here is the result as weird as yours.
1.PNG

But if I change the assemble way from "auto" to "one edge per connector", it works well and I get the mesh I want.
2.PNG

However, I am not sure, what the problem is. Recently, I met another mesh generation case, and the extrusion didn't work even I changed the assemble way.

I wonder what reason causes such problem.
thanks in advance.
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Old   June 10, 2014, 13:10
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siw
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ringtail, I am glad I am not alone with this issue. And I still do not know why it happens - as it happens every time.

I too had a problem with the backward facing step tutorial when creating the mesh in the third-dimension but it was awhile ago so I do not exactly remember what the problem was.
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Old   June 10, 2014, 13:15
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Just a quick reply. I've been following your thread but admittedly I'm having a hard time diagnosing why this is happening. Can you provide more details or perhaps if you want to send me the mesh for inspection, send me a PM to connect through email?
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Old   June 10, 2014, 21:47
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hi siw,

Finally, maybe I found the reason.
As mentioned in this post
http://www.cfd-online.com/Forums/poi...ured-mesh.html

It's a rendering issue.
Change the display precision to double (Edit>Preferences, Graphics).
And it works, at least for my case.

Thanks Chris.
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Old   June 11, 2014, 08:24
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Good to hear you resolved it.
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Old   June 11, 2014, 12:38
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siw
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Many thanks, ringtail. Setting the double precision also worked for me.

cnsidero, is this a bug that should be fixed?
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Old   June 11, 2014, 13:27
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Not a bug. It's a feature to allow user to control rendering accuracy and speed. Single precision should render faster but for models/meshes with fine details and large ranges of magnitude double precision is needed.
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