# 2D Flow over a circular cylinder

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 February 16, 2004, 11:26 2D Flow over a circular cylinder #1 Jonathan Guest   Posts: n/a Hello all, Does anyone have experience with the classic problem of 2D flow over a circular cylinder? How do you create a proper non-reflecting boundary conditions? Our solution for pressure looks very wrong. Does anyone have any experience here? Jonathan

 February 17, 2004, 14:55 Re: 2D Flow over a circular cylinder #2 Tim P. Guest   Posts: n/a I have never performed this problem in FLUENT, but at one time I had printed off some of the validation studies that FLUENT did on it's own code. One of these was on Laminar Flow Around a Circular Cylinder (Re = 20, 40, 100). It must have come from a seperate folder on the original documentation disc that came with FLUENT (5.0), as I can't find it in with the regular user documentation manual that I have access too. As for the non-reflecting boundary conditions, you could try having all of you external boundaries be inlets and outlets, but you wouldn't necessarily have standard shaped domain. Cheers, Tim.

 February 18, 2004, 13:16 Re: 2D Flow over a circular cylinder #3 STK Guest   Posts: n/a I HAVE STUDIED INVISCID FLOW OVER A CYLINDER WITH A CLASSIC 2-D QUADRILATERAL DOMAIN (TWO WALLS INLET AND OUTLET ) WITH FAR-FIELD BOUNDARY CONDITIONS.I DIDN;T HAVE ANY PROBLEM WITH MY RESULTS.BUT YOU HAVE TO KNOW THAT FULL INDEPENDENCY OF MESH WAS SUCCEED AT ABOUT 700.000 TRIANGULAR CELLS (EXACT SOLUTION). I DON'T UNDERSTAND YOUR PHRASE:NON REFLECTING BOUNDARIES? YOU MEAN NO-SHAPED DOMAIN?