{"id":362585,"date":"2024-04-16T23:49:21","date_gmt":"2024-04-16T23:49:21","guid":{"rendered":"\/forum\/forums\/topic\/pathlines-fail-to-establish-and-escape\/"},"modified":"2024-04-16T23:51:50","modified_gmt":"2024-04-16T23:51:50","slug":"pathlines-fail-to-establish-and-escape","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pathlines-fail-to-establish-and-escape\/","title":{"rendered":"Pathlines fail to establish and escape"},"content":{"rendered":"

Hello,<\/p>\n

I’m modelling a 2D microfluidic device that represents a nozzle with a needle that will be used for bio-printing. I designed an axisymmetric model and created a fine mesh (good values for orthogonal quality and aspect ratio, see images 1&2). However, when I want analyze the flow behaviour through the device, the pathlines seem to ‘escape’ the model and errors increase (see image 3).<\/p>\n

I have no idea what I’m doing wrong. I’ve adjusted the mesh multiple times, used different solution methods (SIMPLEC seems to work best), tried to re-build the geometry… But I bump into the same problem over and over again. I’m using an axisymmetric 2D space, and the BC are velocity inlet (on the left), pressure outlet (on the right), no-slip walls (top edges), and axisymmetric axis (lower edge). I get no errors when modelling the simulation.<\/p>\n

What am I doing wrong? Please note that the needle (the outlet) is shortened, and is much longer in the real design.<\/p>\n

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