<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
</head>
<body dir="ltr">
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;">
<p>Hi.</p>
<p>I am trying to study flow over 3D cylinder and made 2D structured mesh with Gmsh(2.12), then extruded to get 3D mesh, then imported to openfoam.</p>
<p>First, there is error while conversion.</p>
<p><br>
</p>
<p>====================</p>
<p><span style="font-family: verdana, geneva, lucida, "lucida grande", arial, helvetica, sans-serif; font-size: 13.3333px; background-color: rgb(247, 247, 247);">Found 8240 undefined faces in mesh; adding to default patch. </span><br>
</p>
<p>====================</p>
<p>Other things are looks good.</p>
<p><br>
</p>
<p><span style="font-size: 12pt;">And the another </span><span style="font-size: 12pt;">error message on checkMesh as below,</span><br>
</p>
<p>====================</p>
<p></p>
<div>Mesh stats</div>
<div> points: 538227</div>
<div> faces: 1500488</div>
<div> internal faces: 1386592</div>
<div> cells: 481180</div>
<div> faces per cell: 6</div>
<div> boundary patches: 7</div>
<div> point zones: 0</div>
<div> face zones: 0</div>
<div><span style="color: rgb(255, 0, 0);"> cell zones: 1</span></div>
<div><br>
</div>
<div>Overall number of cells of each type:</div>
<div> hexahedra: 481180</div>
<div> prisms: 0</div>
<div> wedges: 0</div>
<div> pyramids: 0</div>
<div> tet wedges: 0</div>
<div> tetrahedra: 0</div>
<div> polyhedra: 0</div>
<div><br>
</div>
<div>Checking topology...</div>
<div> Boundary definition OK.</div>
<div> Cell to face addressing OK.</div>
<div> Point usage OK.</div>
<div> Upper triangular ordering OK.</div>
<div> Face vertices OK.</div>
<div><span style="color: rgb(255, 0, 0);"> *Number of regions: 2</span></div>
<div><span style="color: rgb(255, 0, 0);"> The mesh has multiple regions which are not connected by any face.</span></div>
<div><span style="color: rgb(255, 0, 0);"> <<Writing region information to "0/cellToRegion"</span></div>
<div><span style="color: rgb(255, 0, 0);"> <<Writing region 0 with 192080 cells to cellSet region0</span></div>
<div><span style="color: rgb(255, 0, 0);"> <<Writing region 1 with 289100 cells to cellSet region1</span></div>
<div>==========================</div>
<br>
<p></p>
<p>I have only one physical volume(cellzones=1), but it divided into 2 cell regions, say into 2 volumes.</p>
<p>And the interface between these 2 regions is the surface, which is converted into default face patch while conversion.</p>
<p>Attache image shows red line, which is the interface which divide domain into 2 regions when extruded, that is not I want.</p>
<p>The inner circle will be the cylinder that the main my issue, and it is hollow.</p>
<p><br>
</p>
<p>And in geo file, after extrude I added physical volume like this,</p>
<p><br>
</p>
<p>Physical Volume ("3Dcylinder")={1,2,3,4,5,6,7,8,9};</p>
<p><br>
</p>
<p>No surface loop to create volume in my geo file.</p>
<p>Only extrude was used for volume creation.</p>
<p><br>
</p>
<p>Can you give me some hints for fixing this problem?</p>
<p>Thanks so much.</p>
<p><br>
</p>
<p>Best regards,</p>
<p><br>
</p>
<p>w.jeong</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<p></p>
</div>
</body>
</html>