http://www.FEA-Forums.com/ FEA Forums » Topic: 3D Simulation of an Oil Pump en Tue, 07 Feb 2012 23:17:14 +0000 http://www.FEA-Forums.com/topic/91#post-113 Mon, 22 Jun 2009 09:58:07 +0000 ComsolSteiermark 113@http://www.FEA-Forums.com/ <p>Dear Friends !</p> <p>I would really need Your help. I am currently simulating the temporal development of an interface between liquid and gas, by using Comsol Multiphysics.</p> <p>The problem can be simplified in terms of a rotating central liquid pick up (a small rotating cylinder endowed with an internal Archimedean screw), which rotates inside a bigger vertical cylinder. 30% of this cylinder is full of liquid, the upper part is full of gas.</p> <p>I have tried to solve the problem in this term:</p> <p>1. Two phase flow, laminar, level set (chns) + Moving Mesh (ALE).</p> <p>2. BOUNDARY CONDITIONS for Two phase Flow Laminar level Set:</p> <p>For internal rotating walls : no_slip_CW</p> <p>For the External walls of the shell: No slip</p> <p>For the interface: Initial interface</p> <p>Stabilisation method: (GLS)</p> <p>3. Subdomain SETTING for the moving mesh:</p> <p>FREE DISPLACEMENT</p> <p>BOUNDARY CONDITIONS TO PREDICT THE ROTATION OF THE MESH:</p> <p>ROTATE CW: Internal rotating Structure;</p> <p>FIXED: External Shell</p> <p>THIS IS THE ERROR I GOT:</p> <p>Error: 7300<br /> Pointwise constraints for time-derivatives are not supported.</p> <p>Can somebody help me ?</p> <p>Thank You, in advance !<br /> Christiano </p>