http://www.FEA-Forums.com/ FEA Forums » Topic: I need help!! en Tue, 07 Feb 2012 23:29:48 +0000 http://www.FEA-Forums.com/topic/154#post-182 Wed, 10 Mar 2010 00:30:07 +0000 ziv.seemann 182@http://www.FEA-Forums.com/ <p>Hello I'm a new user with comsol but i know my way around,<br /> I need to solve a heating problem in a closed space.</p> <p>In order to do so I'm using comsol multiphysics - incompressible naviar stokes and convection and conduction.</p> <p>After defining the geometry, boundary and subdomains I solved the heat only and then the whole problem, I got an error something like sqrt(-1).<br /> see file at <a href="http://rapidshare.com/files/361389700/didnt_work.mph" rel="nofollow">http://rapidshare.com/files/361389700/didnt_work.mph</a></p> <p>Where did I go wrong?</p> <p>And another question:<br /> If I'm trying to use a fan and I want to set the boundary I have only velocity boundary that fits,<br /> But I need to enter a source (Q) to the equation so how do I do it?</p> <p>I'm attaching the file that i made</p> <p>Thanx!!!!!!! </p>