# what is the difference between 2D and axisymmetric

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 April 3, 2006, 11:00 what is the difference between 2D and axisymmetric #1 Q Guest   Posts: n/a Sponsored Links Can sombody explain what is the difference between 2d and axisymmetric. Let us say I am modelling a channel I and I am 2D simulation that is a plne in xy axis and now let us say the problem is smmtric over x axis then I must simulate chennel with 2d and symmetric boundary condition. Now consider I am simulating a flow in cyleinder and and let us say flow is axissymmetrical and since I am simulating in 2d axis I can assume it as 2d and do the simulation. I just want to know what is wrong in my interpretation. Q

 April 4, 2006, 03:37 Re: what is the difference between 2D and axisymme #2 Ralf Schmidt Guest   Posts: n/a when you are using a axis, fluent calculates the "volume" of the domain rotating the 2D plane AROUND the axis. The means, if you have a axis-symmetric pipe flow (a cylinder) you take the centre line as middle axis and 1/2 cross-section as simulation domain. The symmetry option is used, when you have a symmetry plane (or line in 2D). e.g.: a square, that can be divided into two symmetrical domains. In 2D does that mean, that Fluent will calculate the "volume" with the reference lenght. By the way: Fluent does not accept the BC axis, when the domain is set to symmetry or it does not accept the BC symmetry when it is set to axis-symmetric.

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