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-   -   Problem generating IsoSurfaces (http://www.cfd-online.com/Forums/star-ccm/91371-problem-generating-isosurfaces.html)

eRzBeNgEl August 9, 2011 02:02

Problem generating IsoSurfaces
 
3 Attachment(s)
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

RobertB August 9, 2011 07:27

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.

eRzBeNgEl August 9, 2011 10:30

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

RobertB August 9, 2011 10:44

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.

abdul099 August 9, 2011 13:31

Have you tried "cell surface" (also a derived part)?

ping August 11, 2011 01:34

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.

RobertB August 11, 2011 07:17

To be honest you have never said what you are really trying to achieve here, merely that one step has appeared to have failed.

eRzBeNgEl August 11, 2011 11:58

@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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