https://wiki.uni-due.de/agk/index.php?action=history&feed=atom&title=Windtunnel%2FBoundary_Conditions%2FHistory 2026-04-27T03:01:22Z Revision history for this page on the wiki MediaWiki 1.39.10 https://wiki.uni-due.de/agk/index.php?title=Windtunnel/Boundary_Conditions/History&diff=791&oldid=prev 2025-05-23T15:04:28Z

<p>new</p> <p><b>New page</b></p><div>= Walls =<br /> <br /> * \(v_x\)-profile was slightly asymmetric and even \(v_x&lt;0\) at one wall: &#039;&#039;&#039;Fixed&#039;&#039;&#039; (was an index glitch according to Dennis.)<br /> <br /> = Object =<br /> <br /> == Asymmetry ==<br /> <br /> A strong asymmetry was observed when driven by pressure gradient.<br /> <br /> [[File:Asymmetry.png|thumb|center|500px|\(v_y\) not symmetric to the \(x\)-axis.]]<br /> <br /> &#039;&#039;&#039;Fixed&#039;&#039;&#039;, was related to the viscosity &#039;&#039;field&#039;&#039;: In the solid cells, it should not be set to zero. Actually, the viscosity is a quantity which should be defined on the cell &#039;&#039;boundaries&#039;&#039; just as the stress tensor (but &lt;code&gt;Visc_nu()&lt;/code&gt; deals with cell-centered quantities). Having it zero inside the object yields a vanishing shear stress on the object&#039;s &quot;index-lee side&quot;.</div>

Lothar.brendel