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-   -   Fluent manipulation of 3rd axis(in paper) for 2D cases (https://www.cfd-online.com/Forums/fluent/119778-fluent-manipulation-3rd-axis-paper-2d-cases.html)

 mqasimali June 25, 2013 00:37

Fluent manipulation of 3rd axis(in paper) for 2D cases

hi there,
i am currently modeling a flown channel where flow is in vertical direction i.e top to bottom.
i have given BC's of pressure at inlet and outlet.
what i have required to find out is the velocity.
i have came to know that Fluent by default takes the depth in paper for 2D geometries as 1 m, while the actual depth in paper is around 79mm, it is greatly affecting my velocity profiles in channels,
kindly suggest me any possible solution, can i adjust this depth to the actual one or have to try something else.
Regards

 DonQuijote June 25, 2013 06:17

Hi!

I think there is a missunderstanding in what Fluent gives as 1 m depth. If you are modeling a 2D flow, you are assuming that flow conditions are constant/not relevant along the third edge. So, Fluent uses 1 m depth to give you some magnitudes that need of this component to be sense. For example, pressure along an area with 1 m depth reference.

To summarize, you can not be pretend to model a 3D flow in a 2D model if the third component is not constant, it has no sense. If your flow is approaxing to a 2D flow, then you can easily convert the required magnitudes to your real depth.

Hope it helps!
Regards

 mqasimali June 28, 2013 02:10