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Andrew,<br>
<br>
Thanks for the reply. And can you please confirm that the
polynomials used are Chebyshev? <br>
<br>
<div class="moz-cite-prefix">On 12/8/2015 11:26 AM,
<a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> wrote:<br>
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cite="mid:mailman.11748.1449592030.24727.nek5000-users@lists.mcs.anl.gov"
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<div>Hello, <br>
<br>
</div>
If I've understood you propely, you can see all the
collocation points and weights in the file coef.f (subroutine
genwz).<br>
<br>
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Andrew<br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">2015-12-07 4:23 GMT+01:00 <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:nek5000-users@lists.mcs.anl.gov"
target="_blank">nek5000-users@lists.mcs.anl.gov</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
I'm trying to represent the solution, either velocity or
temperature, in terms of spectral basis, i.e.<br>
<br>
$u=\Sigma a_i \phi_i $ with $\phi_i$ as the basis and $a_i$
as the coefficients.<br>
<br>
I have two questions:<br>
<br>
1) (a naive one!) Which basis is being used in Nek5000? I
assume it is Chebyshev polynomials. Is that true? If not,
what is the basis?<br>
<br>
2) How can I retrieve the coefficients $a_i$? Also, is there
a way to access such coefficients during the solution, say
by writing them to a file?<br>
<br>
I really appreciate the responses. As a side note, I'd like
to use DNS data for model reduction.<br>
<br>
Many thanks,<br>
Saleh<br>
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