[ashishme]

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]

Does anybody have any idea about it??

[flotus1]

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

[ashishme]

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]

I was wondering if anyone could answer that.

[Zaktatir]

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]

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]

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]

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

[ashishme]

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.