[Nek5000-users] rst to ix iy iz

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

Hi,
I guess the question is what you would like to do. From your other posts 
I assume that you would like to use interpolation to compute the value 
of the forcing that you can then input in userf at grid points ix,iy,iz. 
If this is correct, I guess what you would need to do is to regularise 
the forcing by spreading it among a number of actual grid points, e.g. 
using a Gaussian spreading which is centered in the actual point of the 
forcing which does not need to coincide with a grid point.

philipp

On 2018-09-18 14:10, nek5000-users at lists.mcs.anl.gov wrote:
> 
> Dear Jian,
> 
> 
> There are an infinite number of r values but only a finite number
> 
> of ix values, so there is no one-to-one mapping of r to ix.
> 
> 
> If you want the closest one, you could check against the positions of
> 
> the Gauss-Lobatto-Legendre points, zgm1(ix,1), for ix=1,...,lx1.
> 
> 
> Paul
> 
> 
> 
> ------------------------------------------------------------------------
> *From:* Nek5000-users <nek5000-users-bounces at lists.mcs.anl.gov> on 
> behalf of nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
> *Sent:* Tuesday, September 18, 2018 6:09 AM
> *To:* nek5000-users at lists.mcs.anl.gov
> *Subject:* [Nek5000-users] rst to ix iy iz
> Dear nek,
> 
> Do you know how to convert r, s, t in [-1,1] to ix, iy, iz in an element?
> 
> Actually I didn't see too many documents about reference space 
> coordinates. Can you please provide some links for that? Thanks
> 
> Kind regards,
> 
> Jian
> 
> 
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