Thanks for the answer and sorry for my newbie questions. I' m not yet able to create an hole in the farfield. I created the two line loops and made a plane surface using these two loop lines. When i try to mesh in 2d airfoil is not recognize like a hole and there are cell inside it. How can i solve? I tryed to change the characteristic length but nothing change. I attach my new .geo file<div>
<br></div><div>Thanks again<br><div><br><br><div class="gmail_quote">2010/2/20 Eric Nutsch <span dir="ltr"><<a href="mailto:ericnutsch@gmail.com" target="_blank">ericnutsch@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Emanuele,<br>
<br>
<br>
Well first you need to make 2 line loops, one for the airfoil and one<br>
for the farfield(in userguide)<br>
Then make a plane surface using the 2 loops.(userguide)<br>
You will then be able to mesh<br>
To control the mesh size use the characteristic length(userguide)<br>
<br>
If you want to then want to use a boundary layer you will be stuck the<br>
same place as I. It is easy enough to create a boundary layer with the<br>
extrude function, but I have yet to figure out how to attach it to a<br>
farfield mesh.<br>
<font color="#888888"><br>
<br>
Eric Nutsch<br>
</font><div><div></div><div><br>
<br>
On Sat, Feb 20, 2010 at 7:29 AM, Emanuele T. <<a href="mailto:nuovodna@gmail.com" target="_blank">nuovodna@gmail.com</a>> wrote:<br>
> I attach my current .geo file<br>
><br>
> 2010/2/20 Emanuele T. <<a href="mailto:nuovodna@gmail.com" target="_blank">nuovodna@gmail.com</a>><br>
>><br>
>> Thanks for the tip. Now i have another problem. I prepared a .geo file<br>
>> with an airfoil in a circular box. I'd like to obtain a mesh like in<br>
>> attached picture. How can i realize this?<br>
>><br>
>> 2010/2/19 Eric Nutsch <<a href="mailto:ericnutsch@gmail.com" target="_blank">ericnutsch@gmail.com</a>><br>
>>><br>
>>> Emanuele,<br>
>>><br>
>>><br>
>>> If by points you mean cells (for more resolution), you can use the<br>
>>> gmsh "characteristic length" variable (lots of info in the user<br>
>>> guide).<br>
>>><br>
>>> If you actually want more points(not sure why) you would have to write<br>
>>> an interpolation script outside of gmsh (python for instance)<br>
>>><br>
>>><br>
>>> Eric Nutsch<br>
>>><br>
>>><br>
>>><br>
>>> On Fri, Feb 19, 2010 at 12:15 PM, Emanuele T. <<a href="mailto:nuovodna@gmail.com" target="_blank">nuovodna@gmail.com</a>> wrote:<br>
>>> > Hi, i wrote a mesh using naca 0012 points taken<br>
>>> ><br>
>>> > here <a href="http://www.soton.ac.uk/~jps7/Aircraft%20Design%20Resources/Sydney%20aerodynamics%20for%20students/panel2d/naca0012.dat" target="_blank">http://www.soton.ac.uk/~jps7/Aircraft%20Design%20Resources/Sydney%20aerodynamics%20for%20students/panel2d/naca0012.dat</a><br>
>>> > I want to intensify the density of points near the leading edge and the<br>
>>> > trailing edge. How can i obtain this??<br>
>>> > Thanks<br>
>>> > _______________________________________________<br>
>>> > gmsh mailing list<br>
>>> > <a href="mailto:gmsh@geuz.org" target="_blank">gmsh@geuz.org</a><br>
>>> > <a href="http://www.geuz.org/mailman/listinfo/gmsh" target="_blank">http://www.geuz.org/mailman/listinfo/gmsh</a><br>
>>> ><br>
>>> ><br>
>><br>
><br>
><br>
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