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Posted 2012年12月10日 GMT-0500上午5:05 Computational Fluid Dynamics (CFD) 5 Replies
For more information on Hagen-Poiseuille en.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equation
I have a 2d model with a rectangel width 0.1m and length 13m.
At the inlet I have a pressure of 2.52Pa using the pressure, no viscous stress option. And at the outlet 0Pa.
When I calculate the velocity profile for the flow I use the viscosity provided by COMSOL
and I calculate the velocity from
in cylindrical coordinates. R is the radius ie the half width of the rectangel. r i the variable radius.
I have attached a picture with the development of the flow and the calculated velocity profile. What am I doing wrong here?