<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">What is your cfl? You may need to reduce your timestep. <div class="">If you prefer not reducing your timestep you could likely increase your diffusivity or viscosity. </div><div class=""><div class=""><br class=""></div><div class="">(Another possibility is that your restoring timescale is too short, but this seems to be showing up even outside the box.)</div><div class=""> </div><div class="">Matt</div><div class=""><br class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 2, 2021, at 1:54 PM, Peng Zhan <<a href="mailto:peng.zhan@kaust.edu.sa" class="">peng.zhan@kaust.edu.sa</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Hi all,</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">I am running an experiment with rbcs for temperature.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">As shown in the following figure a snapshot of the difference between the rbcs run and the free run, while the region to be relaxed can be specified by the relaxMaskFile (roughly the box area), some unexpected noise appears randomly across the domain. </div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Any hint to get out of it is highly appreciated!</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Thanks in advance, Peng</div><span id="cid:ii_kt3elcbu1"><Screen Shot 2021-09-02 at 11.51.13 PM.png></span><br class=""></div>
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