[GiDlist] Volume Holes

[Thorsten Steinmetz]

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[escolano]

Probably you need to create the intersection of "touching" surfaces, but I don't know what is exactly your case.
Send us your model compressed as zip file to check it.
(can send directly to escolano at cimne.upc.es)

Enrique
----- Original Message -----
From: Thorsten Steinmetz
To: gidlist at gatxan.cimne.upc.es
Sent: Friday, May 27, 2005 6:34 PM
Subject: {SPAM?} [GiDlist] Volume Holes


Dear Enrique Escolano,

I followed your instructions to generate volume holes. This works fine, if the "hole" volume does not touch the surface of the outer volume. Here I tried an substraction, but this leads to the error "Couldn't find point". Could you please tell me, how I can generate a volume hole which touches the surface?

Thank you,

Thorsten Steinmetz.





__________________________________________________

You don't need to use the GiD boolean operations (as I related in a previous mail actually they are very expensives and unstables).
It is only necessary to use boolean operarions if it is needed to build the surface's intersections.

You must create the out cylinder volume, and then create a hole in this volume
menu: Geometry-Create-Volume-Hole
and select other internal volume/s to substract (this operation not create intersections)
Note: This internal volume/s is deleted, maybe you need to create it again, to fill the hole with another volume

When creating a volume you select the outer and inner boundaries. Automatically are detected inner boundaries as holes of the outer boundaries.
(intersections are not checked)

Regards

Enrique Escolan! o

--- -- Original Message -----
From: Thorsten Steinmetz
To: gidlist at gatxan.cimne.upc.es
Sent: Friday, May 27, 2005 10:55 AM
Subject: [GiDlist] Mesh generation outside the model (in free space)


Dear GiD-Team & Users,

for electromagnetic FEM computations of an high-voltage device, I modelled the geometry in GiD 7.5.8, professional version, see the attached picture. However, crucial for the computation is that there is a volume mesh outside the mo! del, too, which represents the free space surrounding the high voltage device in real life. I am now wondering how do get this mesh outside the model. I tried to generate a cylinder and to substract with the "volume boolean operation" the volumes of the model from the outer cylinder, but this resulted in many errors as the volumes surfaces are not closed.

Is there any other possibility to get this surrounding mesh? Maybe a more simple one?

Thanks a lot in advance, yours sincerely,

Thorsten Steinmetz

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Dipl.-Ing! . Thorsten Steinmetz

Helmut-Schmidt-University

University of the Federal Armed Forces Hamburg

School of Electrical Engineering

Theory of Electrical Engineering and Computational Electromagnetics

Holstenhofweg 85

D-22043 Hamburg

Tel.: +49 (0)40 / 6541-2149

Fax : +49 (0)40 / 6541-3764

eMail: thorsten.steinmetz at hsu-hambur! g.de




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