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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hello Neks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am trying to simulate the flow around an interpolated airfoil with curved boundaries. To do so I am generating the collocation points separately and writing them into an input file, which is read in the usrdat2 subroutine before geometry re-initialization. The only curved elements in the mesh are located at the airfoil boundary. I am not getting any errors during geometry re-initialization. However, the calculation starts off with a large courant number (around 7), which ends up diverging after 5 times steps. Along the element edges near the airfoil, there seems to be discontinuities in the flow which cause the solution to diverge. However, when inputting non-curvilinear collocation points, written in the exact same order to the input file, the simulation runs flawlessly. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Are there any switches that must be activated in the rea file for curved elements?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If not, are there any general guidelines to using curved elements in this manner?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Jeremie<o:p></o:p></p></div></body></html>