<HTML><BODY><br>For this geometry, I tried the low Re (~10^3), but the number of iterations for the <span style="font-family: Arial, Tahoma, Verdana, sans-serif;" data-mce-style="font-family: Arial, Tahoma, Verdana, sans-serif;">velx, vely, velz</span> also did not exceed 1. What do you think? Why do I have the same number of iterations for the low Re?<br><blockquote style="border-left:1px solid #0857A6; margin:10px; padding:0 0 0 10px;">
Вторник, 4 декабря 2018, 19:55 +07:00 от nek5000-users--- via Nek5000-users <nek5000-users@lists.mcs.anl.gov>:<br>
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<div id="style_15439281480000001095_BODY"><div class="class_1543946794"><div dir="ltr"><br><div>Your problem has very low viscosity, so there will be very few velocity</div><div>iterations.</div><div><br></div><div>I would suggest turning off the filter if it's not helping -- but most likely</div><div>there is another issue (e.g., perhaps needing more resolution for the target Reynolds</div><div>number).</div><div><br></div><div>For a wing, it might not be a bad idea to first run a 2D airfoil at the target conditions</div><div>just to get an idea of the meshing requirements for the target Re.</div><div><br></div><div>hth,</div><div><br></div><div>Paul</div><div><br></div></div><br><div class="gmail_quote_mailru_css_attribute_postfix"><div dir="ltr">On Tue, Dec 4, 2018 at 6:21 AM nek5000-users--- via Nek5000-users <<a href="//e.mail.ru/compose/?mailto=mailto%3anek5000%2dusers@lists.mcs.anl.gov" target="_blank" rel=" noopener noreferrer">nek5000-users@lists.mcs.anl.gov</a>> wrote:<br></div><blockquote class="gmail_quote_mailru_css_attribute_postfix" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><br><span style="font-family:Arial,Tahoma,Verdana,sans-serif">Hi, Neks!<br><span style="font-family:Arial,Tahoma,Verdana,sans-serif">I am working with a complex geometry which was built in gambit. <span style="font-family:Arial,Tahoma,Verdana,sans-serif">I have some questions. <br>1) When I start Nek5000, I have only 1 itteration for velx, vely,velz, but for the preassure field itterations >30. How can <span style="font-family:Arial,Tahoma,Verdana,sans-serif">it </span>be possible? <br></span></span></span>2) When I set p103=0.1 in .rea file, Courant <font color="#222222" face="sans-serif"><span style="font-size:14px">number </span></font>increases and becomes >1 very fast. How does the filtration effect on the Courant number?<br>I attached my .rea file and logfile.<br><a href="https://drive.google.com/open?id=1YEV2f5Mllqenhu-rk39YJ84_1XHYjC_H" target="_blank" rel=" noopener noreferrer">https://drive.google.com/open?id=1YEV2f5Mllqenhu-rk39YJ84_1XHYjC_H</a> <br><br><font color="#222222" face="sans-serif"><span style="font-size:14px"><b><a href="https://drive.google.com/open?id=1jRKI_zEnb78cR7uXFi3mE0txk6FN3EXQ" target="_blank" rel=" noopener noreferrer">https://drive.google.com/open?id=1jRKI_zEnb78cR7uXFi3mE0txk6FN3EXQ</a> <br></b></span></font></div>
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