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-   -   Gravity Components for Inclined Channel (https://www.cfd-online.com/Forums/fluent/121716-gravity-components-inclined-channel.html)

 ashishme August 4, 2013 05:31

Gravity Components for Inclined Channel

Hi, I am a new user to Fluent. I have a 3D inclined channel say 5 degree inclined from horizontal(X-axis) on XY plane. While enabling gravity, what will be the X, Y and Z components of gravity. Flow is from lower to higher elevation. A small explanation would be highly appreciated. Will it be 0,-9.81,0 or 9.81sin5,-9.81cos5,0 or something else?
For a 2D vertical channel(upward flow) X and Y components are 0 and -9.81.(From a Fluent tutorial).

 ashishme August 17, 2013 03:00

Does anybody have any idea about it??

 flotus1 August 17, 2013 04:44

The direction of the gravity vector is entirely your choice.
No one here knows in which direction gravity is pointing in your simulation.

 ashishme August 18, 2013 09:41

Thanks for your reply..Gravity is acting downward.And I want gravity effects to be included..For 5 degree inclination from X-direction(with flow from bottom to higher level)...I guess..there has to be a fixed set of gravity components to see appropriate results(Specially in cases, when flow is in opposite direction,i.e. from higher to lower level,flow will take place just because of gravity.)

 ashishme December 27, 2013 06:33

I was wondering if anyone could answer that.

 Zaktatir December 27, 2013 08:54

You have to know that the gravity vector is written as : g(vector): (gx,gy,gz)

A picture of your problem would be better to have an understanding of the orientation of the geometry!

 ashishme December 28, 2013 02:46

1 Attachment(s)
Here is the image. Fluid is flowing from left to right. I need to know the gravitational acceleration components to be entered in fluent general section.
Inclination is 5 degree from horizontal.

 ashishme December 28, 2013 03:01

In figure it is horizontal(isometric view), but if it has to be inclined at 5 degree from X-axis, how one will incorporate the gravity effects.

 Zaktatir December 28, 2013 06:03

still the same direction in y-direction (based on your description)

 ashishme December 28, 2013 06:34

In Y-direction, it will be same as before. Inclination is with respect to X-axis only. Does it make it clearer? Let me know plz.

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