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Problem generating IsoSurfaces

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Old   August 9, 2011, 02:02
Default Problem generating IsoSurfaces
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Hi guys,

i have got problems with generating IsoSurfaces. In the following u can see my fluid volume. It is closed with the following blocked system:

umin = Perio_a1
umax = Perio_a2
vmin= = Imp_Hub;Int_b1_Hub;Int_c1_Hub
vmax=Imp_Shroud;Int_c1_Shroud;Int_d1_Shroud
wmin = int_a1
wmax = int_d1

In the attachement you can see a few pictures.

The problem is that, when i want to create a isosurface, it always says that ther is no corner found, Boundaries #0,#3,#4 do not intersect.

What is the problem? My volumina looks closed....

Thanks for help
Attached Images
File Type: jpg umin.JPG (24.2 KB, 17 views)
File Type: jpg vmin.JPG (28.9 KB, 16 views)
File Type: jpg wmin.JPG (23.8 KB, 14 views)
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Old   August 9, 2011, 07:27
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Could explain more clearly.

An isosurface is a 3D surface at a particular value for a calculated quantity. This does not appear very relevant to the problem you are discussing here.

Isossurfaces do, I believe, know anything about geometry but are calculated in a cellwise manner.
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Old   August 9, 2011, 10:30
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Ok, then another way to explain my problem:

I want to create a plane in the shape of hub, or shroud, or inlet and so on...I thought I have to do this by isosurfaces
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Old   August 9, 2011, 10:44
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Any reason you wouldn't use a section - either plane of cylindrical (with appropriate co-ordinate system)?

You can create sections by using isosurfaces of centroid values but in this case it would not seem the preferred manner.
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Old   August 9, 2011, 13:31
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Have you tried "cell surface" (also a derived part)?
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Old   August 11, 2011, 01:34
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You are correct to use the iso-surface for this task (since you dont want a plane section), but you first need to setup the block mapped coordinate system to create the interpolated values across your grid on which to base the iso-surface. This is explained well in the Help tutorial topic Tutorial Guide > Turbomachinery Tutorials > Single Row Tutorial > Visualizing the Solution.
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Old   August 11, 2011, 07:17
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To be honest you have never said what you are really trying to achieve here, merely that one step has appeared to have failed.
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Old   August 11, 2011, 11:58
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@ping

Yes the AxialSingle Row Tutorial is exact what i want to do....just mapping of the new coordinate system is not working and i do not understand why....

Here again:

umin = Perio_a1
umax = Perio_a2
vmin= = Imp_Hub;Int_b1_Hub;Int_c1_Hub
vmax=Imp_Shroud;Int_c1_Shroud;Int_d1_Shroud
wmin = int_a1
wmax = int_d1
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