<p dir="ltr"><br>
Le 16 nov. 2013 02:22, "Xie Longtao" <<a href="mailto:xie@bauwesen.uni-siegen.de">xie@bauwesen.uni-siegen.de</a>> a écrit :<br>
><br>
> Hello everyone.<br>
><br>
> How can I find all the nodes in a specific surface?<br>
><br>
> Although this information is included in the Element Section in .MSH file, <br>
> It is not easy to figure it out for me. Is there any solutions?<br>
><br>
> As boundary conditions are essential in finite element method, it is very helpful to give<br>
> the nodes information in boundary surfaces. </p>
<p dir="ltr">Hello. Boundary conditions in the finite element method are conventionally imposed on boundary elements rather than directly on the nodes constituting them. This is straightforward for natural conditions but can also be applied to essential conditions by penalization.<br>
The idea in Gmsh is to tag the required boundary elements as parts of a Physical Surface (or Physical Line for two-dimensional work); this tag shows up in the list of Elements in the .msh file.</p>
<p dir="ltr">><br>
> By the way. I'll be appreciate if there is a section about boundary nodes grouped by <br>
> boundary surfaces in .MSH file.<br>
><br>
><br>
> Best wishes<br>
><br>
> Xie<br>
><br>
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