<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Oct 13, 2013 at 10:35 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>You can also try error function like profile with 0 value at the inlet and increases to a peak somewhere and stays constant up to the exit so gradient is0 at the exit<br>
Insulation normally refers to the diffusive flux (first form)</div><div class="im"><div>Ammar</div></div></blockquote></div><br>Thanks for the tips. I am using a smoothed initial condition for scalar now. However after some time the scalar does not stay within [0,1] which is important. My time step is already small with cfl ~= 0.1. What can I do to get better behaviour of the scalar ?</div>
<div class="gmail_extra"><br></div><div class="gmail_extra" style>The diffusion coefficient for my scalar is quite small, D = 5*10^(-5).</div><div class="gmail_extra" style><br></div><div class="gmail_extra" style>Regards</div>
<div class="gmail_extra" style>praveen</div></div>