[Nek5000-users] Representing Curved Side in any plane

[nek5000-users at lists.mcs.anl.gov]

Hi,

just double-checked, that's what I did. I only ran it for one time step without
any meaningful physics, though.
Attached are all case files. The nek version I am using is revision 456.

Markus



Quoting nek5000-users at lists.mcs.anl.gov:

>
> Hi Markus,
>
> Did you visualize this with VisIt and with the geometry
> put out into (at least) the first .fld or .f file ?
>
> Paul
>
>
> On Mon, 29 Mar 2010, nek5000-users at lists.mcs.anl.gov wrote:
>
> > Hi,
> >
> > I was looking into the midpoint feature and generated a cube (1 element, x,
> > y, z from 0 to 1) in prenek, then converted all edges to the midpoint
> > notation with prenek, and then manipulated one edge in the rea file. This
> is
> > the resulting curved side section:
> >  ***** CURVED SIDE DATA *****
> >        12 Curved sides follow IEDGE,IEL,CURVE(I),I=1,5, CCURVE
> >  1  1  0.500000       0.00000       0.00000       0.00000 0.00000     m
> >  2  1   1.10000      0.500000       0.00000       0.00000 0.00000     m
> > .
> > .
> > .
> > 10  1   1.00000     -0.500000      0.500000       0.00000 0.00000     m
> > 11  1   1.00000       1.00000      0.500000       0.00000 0.00000     m
> > 12  1   0.00000       1.00000      0.500000       0.00000 0.00000     m
> >
> > where edge 10 is supposedly not a straight line any more.
> >
> > When I run this in nek, however, the cube still comes out with straight
> > edges.
> >
> > Are there any other parameters I need to set?
> >
> > I checked out the most recent nek version and overcame compilation issues
> > with gcc-gfortran 4.4.3-4.fc12 from the fedora 12 repository.
> >
> > Thanks,
> > Markus
> >
> >
> > nek5000-users at lists.mcs.anl.gov wrote:
> >>
> >>
> >> Michael,
> >>
> >> I've only recently added general purpose midside-node support,
> >> which puts a point in 3-space for any one of the 12 edges and
> >> nek then fits a parabola to this.
> >>
> >> I'll set up an example that demos this.  The feature has limited
> >> support at the moment -- but does work in nek5000 and generates
> >> correct geometry.
> >>
> >> Depending on what you are after, there may be other ways to
> >> generate the geometry.   One of my favorite techniques is to
> >> project a given input geometry onto the desired surface.
> >>
> >>
> >> Paul
> >>
> >>
> >>
> >> On Sat, 27 Mar 2010, nek5000-users at lists.mcs.anl.gov wrote:
> >>
> >>
> >>
> >>  Hello Users,
> >>
> >>
> >>
> >>
> >>  My question is in regard to the curved side data section in the REA
> >> file.  I know that the first 3 terms describe the side, element, and
> >> radius, but there are several other numbers that are currently zero, and
> >> then the letter C.
> >>
> >>
> >>
> >>  Background for the question: I have a situation where I would like to
> >> curve an element edge in any plane. I know this is possible from
> >> previous posts regarding a sphere.rea.
> >>
> >>
> >>
> >>  I know that with two points and a radius, that is enough to describe a
> >> circle in a plane.  But lets say I have a side where 2 pts lie on the
> >> XY plane, but the center of the circle is located on the YZ plane for
> >> example... the question is how to represent this in the REA. In the REA
> >> you just give the element side ( 2 pts ) and the radius, which does fix
> >> the circle center but the plane that contains the center is not
> >> fixed.  So what I am wondering is what the other numbers in this
> >> section do...if you could say, give the center instead of the radius, or
> >> give a third point with the other 2 pts in the element side to fully
> >> define the circle and plane.
> >>
> >>
> >>
> >>  Also, Is it possible to curve the remaining 4 sides of the element
> >> (edges 9, 10, 11, 12 that would be in the "z" direction) in the same
> >> manner as edges 1-8? Thanks for any input on this matter!
> >>
> >>
> >>
> >>  Regards,
> >>
> >>  Michael Meador
> >>
> >>
> >> ------------------------------------------------------------------------
> >>
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