<html>
  <head>
    <meta content="text/html; charset=windows-1252"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Hi Tanmoy,<br>
    <br>
    I looked into the "turbchannel.usr" example and it seems that the
    spatial averaging of contractions, i.e., <MijLij>, needs to be
    modified for other geometries.  I Wondered if you have been using
    eddy-visc() routine for channel geometry or some other geometries.<br>
    <br>
    Thanks,<br>
    Mohsen<br>
    <br>
    <div class="moz-cite-prefix">On 14-12-30 11:29 AM,
      <a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> wrote:<br>
    </div>
    <blockquote
      cite="mid:mailman.12741.1419956947.3424.nek5000-users@lists.mcs.anl.gov"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      <div dir="ltr">
        <div>
          <div>
            <div><br>
            </div>
            Hi Mohsen,<br>
            <br>
          </div>
          Yes the turbChannel case is a good point to start with.
          However, explicit filtering as LES model only works when using
          wall-resolved LES. My past experience shows, to use
          wall-model, one must have a good eddy-viscosity model, to
          properly emulate wall layer physics. Explicit filtering of
          LES, is way too bad in preserving the wall physics.<br>
          <br>
        </div>
        Sincerely,<br>
        Tanmoy<br>
      </div>
      <div class="gmail_extra"><br clear="all">
        <div>
          <div class="gmail_signature">
            <div dir="ltr">
              <div>Best Regards,<br>
              </div>
              Tanmoy<br>
            </div>
          </div>
        </div>
        <br>
        <div class="gmail_quote">On Tue, Dec 30, 2014 at 9:07 AM, <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>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div style="word-wrap:break-word">
              Thanks Tanmoy for your suggestion.
              <div><br>
                <div>You are right, for a eddy viscosity type of
                  turbulent model, the Channel example is a good
                  starting point (though, I think it should be
                  considerably modified to be used in a case with a
                  different geometry compared to a channel). But I was
                  thinking of using sort of wall model when employing
                  the explicit filtering of velocity field as a LES
                  model.</div>
                <div><br>
                </div>
                <div>Thanks,</div>
                <div>Mohsen</div>
                <div>
                  <div class="h5">
                    <div><br>
                      <div>
                        <div>On 24-Dec-14, at 11:23 PM, <<a
                            moz-do-not-send="true"
                            href="mailto:nek5000-users@lists.mcs.anl.gov"
                            target="_blank">nek5000-users@lists.mcs.anl.gov</a>>
                          wrote:</div>
                        <br>
                        <blockquote type="cite">
                          <div dir="ltr">
                            <div>Hi Mohsen,</div>
                            <div><br>
                            </div>
                            <div>For LES with near wall modelling, you
                              have to develop your own script in .usr
                              file. There are no in-built routines
                              except eddy_visc() in turbChannel
                              example.  If you use eddy-viscosity type
                              of near wall models in LES, you can modify
                              the scripts and write your own
                              eddy-viscosity routines in uservp. </div>
                            <div><br>
                            </div>
                            <div>Thanks, </div>
                            <div>Tanmoy</div>
                          </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">On Thu, Dec 25,
                              2014 at 12:47 AM, <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>
                              wrote:<br>
                              <blockquote class="gmail_quote"
                                style="margin:0 0 0 .8ex;border-left:1px
                                #ccc solid;padding-left:1ex">Hello all,<br>
                                <br>
                                I have a question regarding LES
                                capability of Nek.<br>
                                I know that the explicit filtering
                                introduced in Nek can be effective for
                                velocity field to provide sort of eddy
                                viscosity modeling. Nevertheless, there
                                should be some form of modeling for the
                                near wall regions, since it is almost
                                infeasible to have DNS like resolution
                                in such regions for problems with
                                relatively high Reynolds number and
                                large scale geometries. I have seen SFR
                                assemblies example on the Nek web in
                                which LES used, however, I am not sure
                                if that was an LES with near-wall
                                resolution or with near-wall modeling.<br>
                                <br>
                                So I was wondering if anyone has any
                                experience of using Nek LES with near
                                wall models, or kind of hybrid RANS-LES
                                approaches.<br>
                                <br>
                                Thanks,<br>
                                Mohsen<br>
                                <br>
                                <br>
                                _______________________________________________<br>
                                Nek5000-users mailing list<br>
                                <a moz-do-not-send="true"
                                  href="mailto:Nek5000-users@lists.mcs.anl.gov"
                                  target="_blank">Nek5000-users@lists.mcs.anl.gov</a><br>
                                <a moz-do-not-send="true"
                                  href="https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users"
                                  target="_blank">https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users</a><br>
                              </blockquote>
                            </div>
                            <br>
                          </div>
                          <div
style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">_______________________________________________</div>
                          <div
style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">Nek5000-users
                            mailing list</div>
                          <div
style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><a
                              moz-do-not-send="true"
                              href="mailto:Nek5000-users@lists.mcs.anl.gov"
                              target="_blank">Nek5000-users@lists.mcs.anl.gov</a></div>
                          <div
style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><a
                              moz-do-not-send="true"
                              href="https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users"
                              target="_blank">https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users</a></div>
                        </blockquote>
                      </div>
                      <br>
                    </div>
                  </div>
                </div>
              </div>
            </div>
            <br>
            _______________________________________________<br>
            Nek5000-users mailing list<br>
            <a moz-do-not-send="true"
              href="mailto:Nek5000-users@lists.mcs.anl.gov">Nek5000-users@lists.mcs.anl.gov</a><br>
            <a moz-do-not-send="true"
              href="https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users"
              target="_blank">https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users</a><br>
            <br>
          </blockquote>
        </div>
        <br>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
Nek5000-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Nek5000-users@lists.mcs.anl.gov">Nek5000-users@lists.mcs.anl.gov</a>
<a class="moz-txt-link-freetext" href="https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users">https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>