> On 19 Nov 2018, at 18:18, Christian Kluge <ckl...@gfz-potsdam.de> wrote:
>
> Dear Christophe,
>
> thank you very much for your help. We were able to calculate the difference
> between the cylinder and the fracture and to automate the process. The
> "BooleanDifference" operation applied to the cylinder and fracture, results
> in partially very small element sizes along the fracture side (see attached
> figure). This causes an incomplete cylinder (upper left) or too fine
> refinements (cylinder bottom).
>
> Is there a possibility to refine the mesh of the cylinder locally?
Sure. You can use all the usual ways to set mesh sizes: on points, using
fields, etc.
To set a target mesh size on the control points of the cylinder, you could e.g.
do (if the cylinder is Volume 1):
Characteristic Length{ PointsOf{ Volume{1}; } } = 0.1;
Christophe
>
> Thank you very much.
>
> All the best,
> Christian
>
>
>
> -----Ursprüngliche Nachricht-----
> Von: Christophe Geuzaine [mailto:cgeuza...@uliege.be]
> Gesendet: Freitag, 16. November 2018 22:58
> An: Guido Blöcher <blo...@gfz-potsdam.de>
> Cc: g...@geuz.org; Christian Kluge <ckl...@gfz-potsdam.de>
> Betreff: Re: [Gmsh] boolean with surface loop
>
>
>
>> On 16 Nov 2018, at 16:43, Guido Blöcher <blo...@gfz-potsdam.de> wrote:
>>
>> Dear Christoph,
>>
>>
>>
>> We try to mesh a three dimensional fracture embedded in a cylindrically
>> shaped rock volume.
>>
>> We can mesh the fracture and the cylinder separately but for later use as
>> input for a numerical simulation, we have to subtract or intersect the two
>> volumes.
>>
>>
>>
>> Unfortunately, gmsh provides an error message regarding our surface loop.
>>
>> Gmsh complains that our surface loop is not a valid openCascade entity.
>>
>
> Indeed: in your script you SetFactory("OpenCASCADE") after having created the
> first volume - which was thus created with the default "Built-In" CAD kernel.
>
> Here's a working script:
>
> <16x32.png><16x32.geo>
—
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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