[Gmsh] Airfoil meshing Naca 0012

[Eric Nutsch]

Your mesh is working, you just had all the CharLenghts set the large
and the same.
I did a find-replace " 1}" with " 0.01}"  then set the far field
CharLenghts and the variables with a 0.01 on them back to 1. (this is
a prime example of why you should use variables to do this, read
userguide tutorials for more info)


I tested it, it looks good. Dont worry about being a newbe, just share
the knowedge you have and expect others to do the same :)


Eric Nutsch





On Sat, Feb 20, 2010 at 12:50 PM, Emanuele T. <nuovodna at gmail.com> wrote:
> 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
> Thanks again
>
>
> 2010/2/20 Eric Nutsch <ericnutsch at gmail.com>
>>
>> Emanuele,
>>
>>
>> Well first you need to make 2 line loops, one for the airfoil and one
>> for the farfield(in userguide)
>> Then make a plane surface using the 2 loops.(userguide)
>> You will then be able to mesh
>> To control the mesh size use the characteristic length(userguide)
>>
>> If you want to then want to use a boundary layer you will be stuck the
>> same place as I. It is easy enough to create a boundary layer with the
>> extrude function, but I have yet to figure out how to attach it to a
>> farfield mesh.
>>
>>
>> Eric Nutsch
>>
>>
>> On Sat, Feb 20, 2010 at 7:29 AM, Emanuele T. <nuovodna at gmail.com> wrote:
>> > I attach my current .geo file
>> >
>> > 2010/2/20 Emanuele T. <nuovodna at gmail.com>
>> >>
>> >> Thanks for the tip. Now i have another problem. I prepared a .geo file
>> >> with an airfoil in a circular box. I'd like to obtain a mesh like in
>> >> attached picture. How can i realize this?
>> >>
>> >> 2010/2/19 Eric Nutsch <ericnutsch at gmail.com>
>> >>>
>> >>> Emanuele,
>> >>>
>> >>>
>> >>> If by points you mean cells (for more resolution), you can use the
>> >>> gmsh "characteristic length" variable (lots of info in the user
>> >>> guide).
>> >>>
>> >>> If you actually want more points(not sure why) you would have to write
>> >>> an interpolation script outside of gmsh (python for instance)
>> >>>
>> >>>
>> >>> Eric Nutsch
>> >>>
>> >>>
>> >>>
>> >>> On Fri, Feb 19, 2010 at 12:15 PM, Emanuele T. <nuovodna at gmail.com>
>> >>> wrote:
>> >>> > Hi, i wrote a mesh using naca 0012 points taken
>> >>> >
>> >>> >
>> >>> > here http://www.soton.ac.uk/~jps7/Aircraft%20Design%20Resources/Sydney%20aerodynamics%20for%20students/panel2d/naca0012.dat
>> >>> > I want to intensify the density of points near the leading edge and
>> >>> > the
>> >>> > trailing edge. How can i obtain this??
>> >>> > Thanks
>> >>> > _______________________________________________
>> >>> > gmsh mailing list
>> >>> > gmsh at geuz.org
>> >>> > http://www.geuz.org/mailman/listinfo/gmsh
>> >>> >
>> >>> >
>> >>
>> >
>> >
>
>