<div dir="ltr">Hi <span style="font-size:12.8px">Tanmoy</span><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">I really don't understand why the interpolation fails.. I hope that someone can help me because a sample low order interpolation could solve my problem.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Thanks anyway </span></div><div><span style="font-size:12.8px">Alessandro</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-11-21 23:53 GMT+01:00 <span dir="ltr"><<a 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"><div dir="ltr"><div><div>Hi Alessandro, <br><br></div>Ok. But, I was not talking about your matlab routines, but rather I was talking about your nek5000 postprocessing mode. I guess they are correct, since you got good results with Tecplot. <br><br>But anyway, the bottom line is, nek5000 uses spectral interpolation routine, so even the higher order polynomials are orthogonal, so it is unlikely that you will have Runge's phenomenon. <br><br></div>Also, I myself use hpts routines for interpolating a turbulent field<br></div><div class="gmail_extra"><br clear="all"><div><div><div dir="ltr"><div>Best Regards,<br></div>Tanmoy<br></div></div></div><div><div class="h5">
<br><div class="gmail_quote">On Fri, Nov 20, 2015 at 10:41 AM, <span dir="ltr"><<a href="mailto:nek5000-users@lists.mcs.anl.gov" target="_blank">nek5000-users@lists.mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Tanmoy<div><br></div><div>thanks for the quick answer, unfortunately I didn't commit this kinds of errors. I have already used my matlab routine for other cases and it worked well, so I'm pretty sure that there isn't errors. The only differences is that I'm using this routine to interpolate the <a href="http://hpts.in" target="_blank">hpts.in</a> points on more complex grid and on a turbulent field. It seams that I have the Runge's phenomenon. Is this possible with the hpts routine?</div><div><br></div><div class="gmail_extra"><div class="gmail_extra">Sincerely</div><div class="gmail_extra">Alessandro </div></div><div><div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br><div class="gmail_quote">2015-11-20 17:29 GMT+01:00 <span dir="ltr"><<a 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:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>Hi Alessandro,<br><br></div>I use exactly the same procedure for my case. Just wondering, by any chance, are there any points in <a href="http://hpts.in" target="_blank">hpts.in</a> which are outside bounds of the original domain, or you may resize the domain in userdat(), while postprocessing in nek5000.<br></div><div class="gmail_extra"><br clear="all"><div><div><div dir="ltr"><div>Best Regards,<br></div>Tanmoy<br></div></div></div>
<br><div class="gmail_quote"><div><div>On Fri, Nov 20, 2015 at 6:46 AM, <span dir="ltr"><<a href="mailto:nek5000-users@lists.mcs.anl.gov" target="_blank">nek5000-users@lists.mcs.anl.gov</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div><div dir="ltr">Dear neks<div><br></div><div>I don't know how Nek5000 performs the interpolation with hpts() routine but I have some problem when I use this last. Using Matlab I built an <a href="http://hpts.in" target="_blank">hpts.in</a> file that contains the points of a structured and not constant mesh, then using Nek in postprocessing mode I evaluate the values of velocity an pressure in this points. When I reshape the hpts.out in order to visualize my domain, there are many zones that have no-sense values!. I performed the same interpolation in tecplot and it works fine. </div><div><br></div><div>my question is: there's any way to perform a first order interpolation in Nek5000? <br></div><div><br></div><div>Sincerely</div><div>Alessandro </div></div>
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