[Nek5000-users] Project a solution onto a polynomial space

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

Dear Juan,

What kind of polynomial space are you projecting onto?

Is it the standard Nek basis (which is piecewise polynomial), or something different?

We have routines to do dealiasing, but it might be better to understand the problem
a bit more.

Paul

________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov [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, March 21, 2017 9:08 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] Project a solution onto a polynomial space


Hello,


I need to compute some non-linear quantities as part of a post-processing procedure. Because they are non-linear, I will need to do some kind of dealiasing. So far, I know how to map the velocity field onto a finer grid (higher polynomial order) to compute the non-linear quantities. However, I don't know how to project the resulting field onto the original polynomial space.


Note, I want to find the "projection" onto the original space, but not the "interpolation".


Thanks,


Juan Diego
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