<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><br><div>Begin forwarded message:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>From: </b></span><span style="font-family:'Helvetica'; font-size:medium;">David Bernstein <<a href="mailto:david.bernstein@meliortechnology.com">david.bernstein@meliortechnology.com</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Subject: </b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>Re: [Gmsh] Problem while trying to merge two surfaces</b><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Date: </b></span><span style="font-family:'Helvetica'; font-size:medium;">September 30, 2013 10:50:22 AM PDT<br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>To: </b></span><span style="font-family:'Helvetica'; font-size:medium;">"Thibaut F. Bourlet" <<a href="mailto:thibaut.bourlet@nus.edu.sg">thibaut.bourlet@nus.edu.sg</a>><br></span></div><br><div>Hi Thibaut, I think the issue here is that Physical Surface is just a grouping function, it doesn't perform a boolean operation on the surfaces like what you might expect.<br><br>Take a look at the modified file attached. It saves the line loops of the beams which are on the channel face and then uses them to create a plane surface afterwards with the line loops subtracted (so this surface has holes). (I looked at the 2D surfaces here, it doesn't generate the 3D mesh properly because of the stuff commented out at the bottom but I think that should be easily fixed).<br><br>Regards,<br>Dave<br><br></div></blockquote></div></body></html>