https://wiki.uni-due.de/agk/index.php?action=history&feed=atom&title=Talk%3AWindtunnel%2FBoundary_Conditions%2Fon_Object 2026-04-05T04:05:08Z Revision history for this page on the wiki MediaWiki 1.39.10 https://wiki.uni-due.de/agk/index.php?title=Talk:Windtunnel/Boundary_Conditions/on_Object&diff=796&oldid=prev 2025-05-23T16:12:39Z

<p><span dir="auto"><span class="autocomment">½-off zero: </span> other fields frozen, not zero</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 18:12, 23 May 2025</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== ½-off zero ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== ½-off zero ==</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>While a velocity value on the object boundary of &quot;almost zero&quot; (by being proportional to the cell size) is tolerable for practical no-slip purposes, what about the other fields? <del style="font-weight: bold; text-decoration: none;">Is it sane </del>to <del style="font-weight: bold; text-decoration: none;">have e</del>.<del style="font-weight: bold; text-decoration: none;">g. an &quot;almost zero&quot; pressure there? </del>--[[User:Lothar.brendel|Lothar]] ([[User talk:Lothar.brendel|talk]]) 17:48, 23 May 2025 (CEST)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>While a velocity value on the object boundary of <ins style="font-weight: bold; text-decoration: none;">always </ins>&quot;almost zero&quot; (by being proportional to the cell size) is tolerable for practical no-slip purposes, what about the other fields? <ins style="font-weight: bold; text-decoration: none;">Inside the object, they are frozen </ins>to <ins style="font-weight: bold; text-decoration: none;">their initial values, too, which is a terribly rough approximation</ins>. --[[User:Lothar.brendel|Lothar]] ([[User talk:Lothar.brendel|talk]]) 17:48, 23 May 2025 (CEST)</div></td></tr> </table>

Lothar.brendel https://wiki.uni-due.de/agk/index.php?title=Talk:Windtunnel/Boundary_Conditions/on_Object&diff=793&oldid=prev 2025-05-23T15:48:46Z

<p><span dir="auto"><span class="autocomment">½-off zero: </span> new section</span></p> <p><b>New page</b></p><div>== ½-off zero ==<br /> <br /> While a velocity value on the object boundary of &quot;almost zero&quot; (by being proportional to the cell size) is tolerable for practical no-slip purposes, what about the other fields? Is it sane to have e.g. an &quot;almost zero&quot; pressure there? --[[User:Lothar.brendel|Lothar]] ([[User talk:Lothar.brendel|talk]]) 17:48, 23 May 2025 (CEST)</div>

Lothar.brendel